What If Deku Had a Cheetah Quirk

 The human body is a marvel of biological engineering. For centuries, before the advent of Quirks, scientists studied the precise mechanisms of bones, muscles, and tendons, marveling at the endurance of the human species. Humans were persistence hunters. Early man could run down prey for miles, slowly exhausting animals that were faster, stronger, and more lethal, simply because humans could sweat and cool themselves down. They could outlast.

Izuku Midoriya, however, was not built to outlast. 

He was built to outpace.

At the age of four, in the middle of a sun-drenched playground in Musutafu, Izuku’s DNA underwent a violent, sudden rewrite. He had been playing tag with Katsuki Bakugo and a few other neighborhood kids. Katsuki, who had recently manifested his own explosive Quirk, was "It."

"Get back here, Deku!" Katsuki roared, tiny palms crackling with smoke and sparks as he chased Izuku toward the sandbox.

Izuku laughed, a breathless, panicked sound. He tried to pump his little legs faster, but Katsuki was closing the distance. Then, an intense, suffocating heat bloomed in the center of Izuku’s chest. It felt as though someone had swallowed a lit coal. He gasped, stumbling, but instead of falling, his body instinctively contorted.

His spine elongated. A sharp, stinging sensation erupted at the base of his tailbone, followed by the sudden, foreign weight of a long, spotted tail snapping out behind him. His ears migrated slightly upward, tapering into soft, furred points. His vision swam, the bright afternoon sun suddenly dimming as his round green eyes narrowed into golden, vertical slits. Short, coarse fur—yellow-gold with stark black spots—burst across his forearms, calves, and jawline. 

Izuku didn't know what was happening, but a primal instinct overrode his four-year-old brain. Run.

He dropped his hands to the grass. His fingers lengthened, nails hardening into semi-retractable claws. His legs reshaped entirely, ankles lifting off the ground into a digitigrade stance. 

When Katsuki lunged, aiming a small explosion at Izuku's back, Izuku pushed off the ground.

BOOM. 

The sound was deafening, but when the smoke cleared, Izuku wasn't there. He was at the opposite end of the park. He had crossed forty yards in the blink of an eye. 

Katsuki stared, jaw dropping. The other kids froze.

Izuku stood at the edge of the trees, panting heavily. The wind was still rushing in his ears. He looked down at his spotted hands, at the claws digging into the dirt. A massive, brilliant smile broke across his face. "Kacchan! Look! I got my—"

The words died in his throat. Suddenly, the heat in his chest flared into an inferno. The world spun violently. His heart was hammering against his ribs like a machine gun, beating at over two hundred times a minute. He couldn't breathe. The air felt like thick, boiling syrup. His newly transformed legs gave out, and he collapsed onto the grass, vomiting his lunch before passing out entirely.

When he woke up in the hospital, wrapped in ice packs, he learned the harsh reality of his existence.

"It's a Mutant-Transformation hybrid Quirk," the doctor told Inko Midoriya, looking at a clipboard. "We'll register it as 'Cheetah.' His body has taken on the anatomical traits of the Acinonyx jubatus. He possesses a deeply specialized skeletal and muscular structure."

Inko wrung her hands, glancing at Izuku, who was sipping ice water, a spotted tail wrapped securely around his waist. "Is he okay? Why did he collapse like that?"

"Cheetahs are the undisputed sprinters of the animal kingdom, Mrs. Midoriya," the doctor explained, his tone grave. "But they are not marathon runners. Your son’s body is optimized for short, explosive bursts of acceleration. His respiratory system, his enlarged heart, his nasal passages—they are all designed to pull in massive amounts of oxygen to fuel his muscles. But the byproduct of that kind of energy output is heat."

The doctor turned to Izuku. "Izuku, your body temperature rises exponentially when you run at top speed. Normal human bodies operate at about 37 degrees Celsius. When you sprinted today, your core temperature spiked to nearly 41 degrees. If you push yourself past forty-five seconds of top speed, you will suffer severe heatstroke. Your brain will quite literally begin to cook. Furthermore, to accommodate his speed, his bones are incredibly porous and light. He is fragile. A heavy blunt-force impact could shatter him."

Izuku looked down at his claws. The dream of being a hero like All Might—a mountain of muscle who could take any hit and smile—suddenly felt miles away.

"He can’t endure," the doctor finished. "He’s a glass cannon."

When Izuku returned to school, the kids were initially amazed by his transformation. But the awe wore off quickly. When they played Heroes and Villains, Izuku could tag everyone in five seconds flat, but afterward, he would be completely incapacitated, lying in the shade, panting wildly, chugging water to cool his boiling blood. 

Katsuki, ever the pragmatist, scoffed at him. "You're a one-pump chump, Izuku. You go fast for a minute and then you're dead weight. You're still just a useless Deku."

From that day on, the nickname stuck. Deku. The one who couldn't last. The useless one.

Ten Years Later

Middle school was a cruel ecosystem, and Katsuki Bakugo was its apex predator. 

Izuku Midoriya sat at his desk, his long, spotted tail wrapped tightly around the leg of his chair to keep it out of the aisles. At fourteen, his mutation was permanent and pronounced. He possessed a lean, wiry build, completely devoid of bulky muscle. He stood on digitigrade legs, making him taller than most of his peers, though he often slouched to hide it. His feet were elongated, resembling the paws of a big cat, forcing him to wear specially modified, open-toed footwear. A smattering of fine, spotted fur dusted his cheeks and arms, and his ears were distinctly feline, swiveling independently to catch the whispers of his classmates.

"So, as third-year students, it's time to start thinking seriously about your futures!" the homeroom teacher announced, slapping a stack of papers against his desk. "But who am I kidding? You all want to be heroes, right?"

The classroom erupted into cheers, students flashing their Quirks. 

Izuku kept his head down, scribbling furiously in his notebook. The cover read: Hero Analysis for the Future, Vol. 13. 

Unlike other Quirk enthusiasts who merely cataloged flashiness and power rankings, Izuku’s notes read like a biomechanical engineering thesis. He couldn't afford to just understand power; he had to understand limits. His notebook was filled with thermodynamic equations, tensile strength limits of human bone, and advanced martial arts theory. Since his own bones were hollow and light, similar to a bird's, he couldn't throw a standard punch without risking a fracture. Instead, he studied Capoeira and parkour, learning to use his tail as a counterbalance to redirect momentum rather than absorbing impacts. 

"Hey, teach, don't lump me in with these background characters," Bakugo’s arrogant drawl cut through the noise. He kicked his feet up onto his desk. "I'm the real deal. I'm going to U.A. High."

The class muttered in awe. U.A. was the most prestigious hero academy in the country. 

"Oh, Midoriya," the teacher said, glancing at his clipboard. "Didn't you want to go to U.A. too?"

The classroom went dead silent. Then, a roar of laughter shook the walls.

"Deku? U.A.?" 

"Are they opening a zoo department?"

Izuku shrunk into his seat, his ears pressing flat against his messy green hair. 

Bakugo slammed his hands on his desk, an explosion rocketing him over the chairs until he landed directly in front of Izuku. The heat radiating from Bakugo’s palms made Izuku’s sensitive skin prickle. Heat was Izuku’s greatest enemy. 

"Listen to me, Deku," Bakugo snarled, smoke curling from his fingers. "You might be fast, but you're a brittle little twig. One good blast from me and you'd snap in half. You think some feral alley cat can compete with me?"

Izuku didn't flinch, though his vertical pupils dilated slightly. "I-I don't want to compete with you, Kacchan. I just... I want to save people. My speed can save people."

"Until you overheat and stroke out on the pavement," Bakugo scoffed, snatching Izuku’s notebook from his desk. He glanced at the cover. "Hero Analysis? What a joke." 

Before Izuku could react, Bakugo pressed his palms together and detonated a localized explosion, scorching the notebook. He tossed the smoldering remains out the open window. "Do yourself a favor, furball. Take a dive off the roof and pray you're born with a better Quirk in the next life."

The words stung, but Izuku had long ago learned to compartmentalize the pain. He waited for class to end, quietly collected his things, and went outside to fish his ruined notebook out of the koi pond. 

I'm not useless, Izuku told himself as he wrung the water from the burnt pages. My engine just runs a little hotter. I just need to be smart.

Walking home, Izuku took the route under the overpass, avoiding the crowded streets. His enhanced hearing picked up the distant hum of traffic, the chatter of pedestrians, and the clinking of bottles. Then, he heard something else.

A wet, slithering sound. Like mud sliding down a drain, but immense.

Izuku’s feline ears twitched, swiveling backward. He spun around, his claws instinctively extending from his fingertips. 

Rising from the manhole behind him was a massive, sentient mound of putrid green sludge. Two bulbous eyes rolled within the liquid mass, locking onto Izuku.

"A medium-sized meat suit," the Sludge Villain gurgled, its voice wet and echoing. "And look at those legs. You'll make a great getaway vehicle, kid."

Instinct took over. The adrenaline dumped into Izuku’s bloodstream, and the world slowed down. His heart rate immediately spiked to 150 BPM. He dropped to all fours, his digitigrade legs coiling like springs. 

The villain lunged. 

Izuku pushed off the concrete. The acceleration was instantaneous. He didn't just run; he vanished. He cleared ten meters in a fraction of a second, reappearing behind the villain, his claws fully unsheathed. 

Aim for the vulnerable spots, Izuku thought, his mind racing. Liquid body. No bones. No joints. The only solid matter are the eyes and the teeth.

He rebounded off the wall of the underpass, launching himself at the villain's back. He slashed his claws in a rapid, blinding arc, aiming for the creature's optical nerves. But the sludge shifted, absorbing the blow. Izuku's hands sank deep into the thick, suffocating mud.

"Too slow, kitty!" the villain laughed. The sludge surged backward, engulfing Izuku's arms, then his torso, and finally, his face.

The smell of sewage flooded Izuku's highly sensitive nose. It was blinding, paralyzing. The sludge forced its way down his throat, cutting off his oxygen. 

No, Izuku panicked, trashing wildly. I can't breathe. My Quirk—I need oxygen!

His heart rate was at 200 BPM. His body was trying to initiate a sprint, trying to generate the immense power needed to escape, but without oxygen, his engine was stalling. His core temperature skyrocketed. 38 degrees. 39 degrees. 

His vision went dark. He was going to die here. A predator suffocated by a puddle.

Then, the manhole cover blew clean off its hinges. 

"FEAR NOT, YOUNG MAN!" a booming voice echoed through the tunnel. It was a voice Izuku had heard a thousand times on his computer screen. "I AM HERE!"

The immense air pressure of a Texas Smash blew the Sludge Villain apart into a million droplets. Izuku fell to the ground, coughing violently, violently dragging oxygen back into his starved lungs. His fur was matted with sweat and sewage. He looked up, his slit eyes struggling to focus, and saw the towering, muscular form of All Might.

The Number One Hero efficiently scooped the villain into two empty soda bottles. "SORRY ABOUT THAT! I WAS PURSUING THIS EVIL-DOER AND LOST TRACK OF HIM IN THE SEWERS! ARE YOU ALRIGHT, YOUNG MAN?"

Izuku scrambled to his feet, his tail lashing wildly in starstruck excitement. "Y-You're All Might! I'm a huge fan! C-Could you sign my notebook?" He held up the damp, burnt notebook.

All Might had already signed it in the fraction of a second Izuku was distracted. "DONE! WELL, I MUST BE OFF TO DELIVER THIS FIEND TO THE POLICE! STAY OUT OF TROUBLE!"

"Wait!" Izuku blurted out. The words tumbled from his mouth before he could stop them. "Can I ask you a question?"

All Might crouched, preparing to leap. "SORRY, NO TIME!" 

As the hero jumped, Izuku's instincts fired again. Without thinking, he sprang forward, his claws finding purchase on the fabric of All Might's cargo pants. He rode the hero up into the stratosphere, the wind tearing at his face. 

After a panicked mid-air struggle, they landed on a nondescript rooftop. All Might scolded him, but before the hero could leave, a plume of smoke suddenly rose from All Might's massive frame. In a hiss of steam, the towering symbol of peace shrank into a skeletal, emaciated man coughing up blood.

Izuku’s jaw dropped. His feline ears flattened against his skull. "W-What? You're a fake!"

Toshinori Yagi wiped the blood from his chin, sighing. "I assure you, I am All Might. Five years ago, a villain destroyed my respiratory system and half my respiratory organs. I can only do hero work for about three hours a day."

Izuku’s analytical mind immediately connected the dots. Respiratory damage. Limited stamina. Time limits. 

"All Might," Izuku whispered, stepping forward. "My Quirk... it's a mutation. I can move faster than almost anyone. But I can't sustain it. If I run at top speed for more than forty-five seconds, my core temperature cooks my own organs. My bones are hollow. I can't take a hit. Everyone tells me I can't be a hero because my body can't handle the strain of a drawn-out fight." 

Izuku looked down at his clawed hands, trembling. "Can someone... can someone whose own body fights against them... still become a pro hero?"

Toshinori looked at the boy. He saw the unusual, beast-like mutation, but more importantly, he saw the desperate, human eyes staring back at him. 

"A pro hero always has to put their life on the line," Toshinori said gently, but firmly. "If your body actively endangers you in a prolonged battle, being a frontline brawler might be fatal. Villains don't abide by time limits. If you lose steam in a minute, you could die, and the people you're protecting could die."

Izuku's heart sank. His tail drooped, hitting the roof's gravel. 

"However," Toshinori continued, raising a bony finger. "There are many ways to be a hero. Rescue heroes, underground heroes, reconnaissance experts. With your speed, you could evacuate a collapsing building faster than I ever could. You have to play to your strengths, young man. Don't try to be me. Be the hero your body allows you to be."

It wasn't a perfect validation, but it wasn't a rejection either. It was realism. 

Toshinori moved to check his pockets for the soda bottles, only to freeze. The bottles were gone. Dropped during the mid-air struggle.

A booming explosion echoed from the shopping district a few blocks away. Plumes of black smoke rose into the sky. 

Both of them realized the horrifying truth at the same time. 

Izuku didn't wait. He bounded off the roof, his claws gripping the edges of buildings as he descended via fire escapes, his descent rapid and silent. He hit the pavement running, weaving through the crowded streets. 

When he arrived at the alleyway, a crowd had gathered. Pro heroes—Death Arms, Kamui Woods, Backdraft—were standing around helplessly. The alley was completely engulfed in fire. And in the center of the blaze was the Sludge Villain, vastly enlarged, possessing the body of a teenager. 

The teenager was thrashing, setting off massive explosions. 

Kacchan.

Izuku froze. The intense heat of the alleyway was already suffocating. For a cheetah mutation, standing near a raging fire was literal torture. His internal thermostat was screaming at him to flee. 

"None of us have the right Quirks for this!" Death Arms shouted, shielding his face from the flames. "We have to wait for someone with a water Quirk!"

Izuku watched Katsuki’s eyes roll back into his head, desperate for air. He was suffocating. Just like Izuku had.

The pros were waiting. Waiting for the perfect Quirk. Waiting for a better situation.

Izuku didn't wait. 

His pupils dilated into wide, black ovals. His lips pulled back over his sharp teeth in an involuntary snarl. He dropped to all fours. 

"Hey, kid! Stop!" Death Arms yelled.

BOOM.

The concrete beneath Izuku's paws cracked. He accelerated from zero to sixty miles per hour in two strides. The sheer velocity created a vacuum, temporarily parting the flames as he shot through the alley like a yellow-and-black missile. 

My limit is forty-five seconds, Izuku calculated, his mind running as fast as his legs. I don't need forty-five seconds. I need three.

"You again?!" the Sludge Villain roared, raising a massive tendril to swat the boy away.

Izuku didn't dodge. He used the wall. He leaped laterally, his claws digging into the brickwork, wall-running for a split second before launching himself off the masonry directly at the villain's face. 

Solid matter, Izuku reminded himself. 

He didn't punch. His hollow bones would snap. Instead, he twisted in mid-air, bringing his long, muscular tail around in a brutal, whip-like strike. The heavy appendage slammed into the villain's left eye with a sickening pop. 

The villain screamed in agony, its grip loosening. Katsuki gasped, pulling his mouth free. "Deku?!"

"Grab my hand!" Izuku screamed. He didn't have the strength to pull Katsuki out, so he relied on his momentum. He dug his claws into Katsuki's uniform, planted his digitigrade feet on the sludge villain's chest, and pushed off with explosive force. 

The recoil ripped Katsuki free of the sludge, sending both boys tumbling backward through the air. They crashed into the asphalt, rolling several times before coming to a halt.

Izuku was instantly overwhelmed by heat. The fire in the alley, combined with his sprint, pushed his core temperature into the red zone. He lay on the ground, panting violently, his tongue lolling out, unable to stand. 

Before the Sludge Villain could recover and attack, All Might appeared, having been spurred into action by Izuku's reckless bravery. With a mighty Detroit Smash, All Might obliterated the villain, creating a localized rainstorm that doused the fires.

In the aftermath, the pros scolded Izuku fiercely. "Are you suicidal?!" Death Arms shouted. "Your bones could have shattered! You were practically melting in that heat! Leave it to the professionals!"

Izuku just nodded, accepting the berating. He was exhausted, dehydrated, and dizzy. But as he looked over at Katsuki, who was being praised for his powerful Quirk, Katsuki glared back. It wasn't a glare of superiority. It was a glare of profound frustration.

Katsuki knew the truth. When the pros stood by, the useless, fragile, overheating Deku was the only one who had moved. 

On the walk home, All Might intercepted Izuku.

"Young Midoriya," Toshinori said, standing under the glow of a streetlamp. "I told you to be a hero your body allows you to be. Today, your body told you to run away from that fire. But your heart made you run toward it. You have the spirit of a true hero."

Izuku looked up, his feline ears perking up in surprise. 

"I cannot offer you my Quirk," All Might said softly. "But I can offer you my guidance. You want to pass the U.A. Entrance Exam? You want to be a hero who saves people in the blink of an eye?"

Izuku nodded, tears pricking the corners of his slit eyes. "Yes."

"Then we have ten months to turn you into the apex predator of the rescue world. Are you ready?"

The Ten Months of Hell

The training at Dagobah Municipal Beach Park was unlike anything Toshinori had ever prescribed. He quickly realized that the standard "American Dream Plan"—lifting heavy refrigerators and towing trucks—would permanently cripple Izuku. Izuku’s skeletal structure was designed for aerodynamics and speed, not bearing massive weight.

Instead, Toshinori focused on refining Izuku's biomechanics. 

"Your Quirk is a high-performance sports car, young Midoriya!" Toshinori barked, sitting atop a pile of cleared trash while Izuku ran wind sprints across the sand. "But your cooling system is terrible, and your chassis is fragile. We need to upgrade your efficiency!"

The first phase was Thermoregulation. Izuku had to learn to manage his heat. Toshinori made him do high-intensity interval training (HIIT) while wearing thermal clothing. It was agonizing. Izuku learned to recognize the exact warning signs of his impending heatstroke: the blurring of his peripheral vision, the metallic taste of blood in his mouth, the ringing in his ears. He learned a breathing technique—a rapid, panting rhythm similar to a dog or a cheetah—that expelled heat from his lungs more efficiently. He pushed his limit from forty-five seconds to a flat sixty seconds of absolute, 100% output before he redlined. 

The second phase was Agility and Impact Distribution. Since Izuku couldn't punch through a steel robot, he had to learn how to dismantle them. He studied martial arts that favored kicks, grapples, and joint manipulation. He incorporated his tail into his fighting style, using it to sweep legs or wrap around poles for rapid changes in direction. He practiced parkour on the trash heaps, learning to disperse the kinetic energy of a sixty-mile-per-hour sprint by rolling, sliding, and rebounding off surfaces rather than coming to a dead stop. 

The third phase was Precision. At top speeds, the human brain struggles to process visual information. Everything becomes a blur. Izuku spent hours sprinting through densely packed obstacle courses Toshinori built out of rusty appliances, forcing himself to rely on his enhanced feline hearing and sight to navigate without crashing. 

By the end of the ten months, the beach was spotless. 

On the morning of the exam, Izuku stood before Toshinori. He hadn't gained the bulging muscles of a bodybuilder, but his physique was dramatically changed. He was incredibly lean, every muscle tightly coiled like steel wire under his skin. His posture had improved, his digitigrade stance perfectly balanced by his muscular, spotted tail. 

"You look ready, kid," Toshinori smiled, handing him a water bottle. "Remember. You can't out-brawl them. You have to out-think them, and outrun them."

"I know," Izuku said, stretching his arms, his claws gleaming in the morning light. "Hit fast, hit the weak points, and keep moving."

The U.A. Entrance Exam

The sheer scale of U.A. High School was intimidating. Izuku walked up the central path, his tail swishing nervously behind him. He was hyper-aware of the stares from the other applicants. Mutation Quirks were common, but Izuku's appearance was distinctly feral. 

As he walked, his foot caught on a slightly raised paving stone. With his modified anatomy, tripping at a walking pace was incredibly awkward. He stumbled forward, bracing for impact. 

Suddenly, he stopped mid-air. 

"Are you okay?" a cheerful voice asked. 

Izuku looked back. A girl with a round face, rosy cheeks, and brown bobbed hair was holding her hand out. She had touched his backpack, rendering him weightless. 

"It's my Quirk," she explained, releasing the effect and allowing Izuku to land gracefully on his padded feet. "Sorry for using it without asking, but it would be bad luck to fall right before the exam!"

Izuku’s tail immediately wrapped tightly around his own waist, betraying his immense anxiety at talking to a cute girl. "T-Thank you! I'm fine! Y-Your Quirk is amazing!" 

She beamed at him. "I'm Ochaco Uraraka! Good luck in there!" 

She jogged off, leaving Izuku standing there, his face burning hotter than his Quirk ever made him. 

Inside the auditorium, the Voice Hero, Present Mic, explained the rules of the practical exam. It was a mock urban battle. Applicants would be placed in massive, fake cities and tasked with destroying villain robots worth one, two, or three points. There was also a massive Zero-Pointer, an obstacle designed to be avoided.

Izuku took frantic notes. Villain robots. Steel armor. Heavy weaponry. 

"Excuse me!" A tall, stern-looking boy with glasses stood up, pointing rigidly at Present Mic. "The printout mentions four types of robots! If this is a misprint, U.A. should be ashamed! Furthermore, you, the boy with the tail and the messy hair!" 

The boy pointed directly at Izuku. The entire auditorium turned to look. 

"Your muttering is highly distracting!" the boy scolded. "And your casual posture is unbecoming of a U.A. candidate. Are you taking this seriously?"

Izuku’s ears flattened in embarrassment. "I-I'm sorry. I was just analyzing the robot specs."

I can't smash through armor, Izuku thought, ignoring the giggles of the crowd. But they're machines. They have optical sensors. They have exposed joints, wiring, and hydraulic lines. If I sever the nerves, the monster dies.

Twenty minutes later, Izuku stood before the colossal gates of Battle Center B. He was wearing light, breathable athletic wear, modified to accommodate his legs and tail. He carried a small hydration pack on his back. Dehydration was his fastest ticket to failure.

He looked around. Uraraka was there, stretching. The stern boy with glasses—who seemed to have engine pipes protruding from his calves—was doing high knees. 

"Okay, start!" Present Mic's voice boomed from the towers. "What's wrong? There are no countdowns in real battles! Run, run, run!"

The crowd hesitated. 

Izuku didn't. 

He dropped to all fours. The moment his hands touched the pavement, his pupils narrowed into slits. His muscles fired, burning oxygen at an astronomical rate. 

BOOM. 

A shockwave of dust kicked up from the starting line. The other applicants gasped as a yellow-and-black blur shot through the open gates at over sixty miles per hour. 

Izuku was entirely in his element. The wind roared in his ears. The fake city rushed past him in a smear of gray concrete. 

Around the first corner, a massive, tread-bound Two-Pointer rolled into the street, raising its arm cannons. Its robotic voice droned, "TARGET ACQUIRED."

It fired a volley of rubber bullets. 

To Izuku's hyper-accelerated perception, the bullets were moving in slow motion. He didn't just dodge them; he danced through them. He bounded off the wall of a nearby building, leaping over the robot's line of fire. 

As he sailed over the machine's head, he unsheathed his claws. The hardened keratin sliced through the air. He didn't aim for the thick steel plating on the robot's head. He aimed for the glowing optical sensors and the thick bundle of wires connecting the head to the chassis. 

Slash. 

Izuku landed softly on his padded feet and kept running without looking back. Behind him, the Two-Pointer sparked wildly, its "eyes" going dark, before collapsing into a useless pile of scrap metal. 

Two points! Izuku thought, his heart rate climbing to 140 BPM. Keep moving. Keep breathing.

He became a phantom in the fake city. While the strength-enhancers brawled in the main streets, trading heavy blows with the robots, Izuku utilized his agility. He scaled buildings with terrifying speed, running across the rooftops, his tail providing perfect balance. From his vantage point, his enhanced hearing picked up the whirring of servos and the clanking of metal. 

He would drop from the sky like a hunting leopard, land on a Three-Pointer, rip out its hydraulic lines with his claws or teeth, and vault away before the machine even registered it was dead. 

Five points. Twelve points. Twenty points. 

He was racking up a massive score, but the toll on his body was immediate and brutal. 

Seven minutes into the ten-minute exam, Izuku hit his first wall. 

He had just dismantled a One-Pointer when his vision suddenly swam. The world tilted sideways. A wave of nauseating, oppressive heat radiated from his chest, making his skin feel like it was on fire. He stumbled into an alleyway, collapsing against the brick wall. 

He ripped the hose of his hydration pack to his mouth, sucking down tepid water, but it felt like pouring a thimble on a forest fire. His fur was drenched in sweat. His heart was hammering at 220 BPM. He was panting frantically, his tongue hanging out, trying to expel the heat. 

I've been sprinting too much, he realized, clutching his chest. I haven't been managing my cooldowns. I'm redlining.

He checked his imaginary watch. Three minutes left. He had twenty-eight points. Was that enough? He didn't know. 

Above the fake city, in the observation room, the U.A. faculty watched the screens. 

"Fascinating," Nezu, the principal, murmured, sipping his tea. He pointed a white paw at the screen displaying Izuku, who was hiding in the alley, recovering. "The boy with the cheetah mutation. Applicant Midoriya. He has the highest elimination rate per minute of any student out there."

"But look at him," the pro hero Midnight noted, tracing a finger over her chin. "He's exhausted. His stamina is incredibly low. He's a sprinter in an endurance test."

"He understands his limits, though," the underground hero Eraserhead muttered, his tired eyes narrowing. "He’s not fighting mindlessly. He hits the weak points, secures the kill, and retreats. It’s highly logical. But..." Aizawa pressed a button on the console. "Let's see how logical he is when the situation becomes irrational."

Back in the city, the ground began to tremble. 

Izuku felt the vibrations through his digitigrade feet before he heard the noise. He pushed himself off the wall, his ears swiveling frantically. 

A shadow fell over the city block. 

Buildings shattered like glass as a towering, skyscraper-sized behemoth crushed its way into the main avenue. The Zero-Pointer. It was a mechanical titan, its treads chewing up the asphalt, its massive red eye glowing with menacing intent. 

"Less than two minutes remaining!" Present Mic announced. 

Panic erupted in the streets. The applicants, who had been confidently smashing robots just moments before, turned and fled in terror. 

It's massive, Izuku thought, frozen in the mouth of the alley. His animal instincts—the deeply ingrained survival mechanisms of a wild feline—screamed at him. Predator. Too big. Unkillable. Flee. Run away.

He took a step back, preparing to sprint in the opposite direction. 

"Ow!" 

The cry of pain was barely audible over the grinding gears of the Zero-Pointer, but Izuku’s ears twitched. He snapped his head toward the sound. 

There, in the middle of the street, was Uraraka. A massive chunk of debris had fallen from a crushed building, pinning her leg to the ground. She was struggling wildly, using her Quirk on the rubble, but she was exhausted, clutching her stomach in nausea. 

The Zero-Pointer rolled forward. Its massive tread was heading directly for her. 

The other applicants ran right past her. Even the stern boy with the engine legs hesitated, his face pale with fear, before turning away. 

Izuku’s brain calculated the variables instantly. 

Distance: 60 meters. 

Time until she is crushed: 6 seconds.

My physical status: Overheated. Core temperature 39.5 degrees. Muscles fatigued. 

If he ran now, he would break his forty-five-second limit. His blood would literally begin to boil. The friction could tear the ligaments in his legs. 

But as he looked at Uraraka's terrified face, the calculations vanished. 

There was no thought. There was only motion. 

Izuku dropped to all fours. He didn't just accelerate; he exploded. The pavement beneath his feet shattered, craters forming where his claws dug in for traction. 

He pushed his body past 100%. He tapped into the absolute, dangerous zenith of his Quirk's output. 

To Izuku, time stopped. The falling debris hung suspended in the air. The grinding treads of the Zero-Pointer became a low, drawn-out groan. The world lost its color, fading into a blur of motion lines. 

The heat inside him flared into pure agony. It felt as though someone had injected molten lead into his veins. His muscles screamed, micro-tears shredding his calves and thighs. He could smell his own fur singeing from the sheer friction of the air resistance. 

Faster, his mind demanded. 

He crossed the sixty meters in 1.8 seconds. 

He arrived at Uraraka's side just as the shadow of the massive tread eclipsed them. 

Izuku didn't waste time trying to lift the debris. He drove his claws into the concrete beneath her, hooked his arms under her torso, and pulled with all his might. The sheer kinetic energy of his momentum ripped her free from the rubble, her leg sliding out just in time.

But they were still in the crush zone. 

With Uraraka cradled in his arms, Izuku looked up. The tread was coming down. He couldn't run laterally; the debris field was too thick. 

He had to go up. 

A massive pillar of concrete was toppling backward from the building the robot had just crushed. Izuku lunged onto the falling pillar. 

Defying gravity, he ran vertically up the falling debris, his claws acting like climbing spikes, digging deep into the stone. He was moving so fast that gravity didn't have time to claim him. 

He reached the top of the pillar, the Zero-Pointer's massive arm swiping through the air right where they had just been. Izuku leaped off the falling concrete, soaring through the air in a massive, parabolic arc over the street, entirely clearing the danger zone. 

They crashed into the roof of an intact building three blocks away. 

Izuku took the brunt of the impact, twisting his body in mid-air to land on his back, shielding Uraraka. He slid across the gravel roof, tumbling to a violent halt against an air conditioning unit. 

"TIME'S UP!" Present Mic screamed. 

A loud siren blared across the fake city. The Zero-Pointer ground to a halt, its red eye shutting off. 

Uraraka groaned, sitting up. She looked down at her leg, then up at Izuku. "Y-You saved me. You moved so fast, I didn't even see you."

Izuku didn't answer. 

He was lying on his back, staring blankly at the sky. His body was emitting visible waves of steam. His skin was flush, his mouth wide open as he took shallow, erratic breaths. His heart was fluttering dangerously, beating so fast it sounded like a continuous hum rather than individual beats. 

Hot, was his only thought. So hot. 

Uraraka crawled over to him, panic setting in as she felt the intense heat radiating from him. "Hey! Hey, are you okay?! Someone, help! He's burning up!" 

Within minutes, the medical robots arrived, followed closely by Recovery Girl. The elderly heroine took one look at Izuku's flushed skin and rapid breathing and immediately began administering cooling packs and intravenous fluids. 

"Foolish boy," she chided, though her voice held a note of awe. "He pushed his mutation past its biological threshold. He gave himself severe heatstroke and tore nearly every muscle fiber in his lower body to achieve that speed."

As the darkness claimed him, pulling him away from the burning agony of his overheated body, Izuku smiled weakly. 

He hadn't punched the robot. He hadn't fought the monster. He had just run. And he had saved her. 

A week later, Izuku sat at his dining room table, staring at a small, circular metal disc. Inko Midoriya paced nervously behind him. 

The projection snapped on, revealing the imposing form of All Might. 

"I AM HERE AS A PROJECTION!" All Might announced. 

Izuku’s ears perked up, his tail twitching anxiously. 

"Young Midoriya! You passed the written exam with flying colors. However, in the practical, you scored a respectable twenty-eight combat points. Sadly, that alone was not enough to secure a top spot."

Izuku’s heart sank. He had stopped scoring to recover, and then the Zero-Pointer appeared. He had failed. He was just the useless Deku after all. 

"But!" All Might raised a hand. "The Entrance Exam is not graded solely on combat! A hero academy that does not reward self-sacrifice is no hero academy at all!" 

The screen shifted, showing a video of Uraraka in the faculty office, begging Present Mic to give Izuku some of her points because he had saved her life. 

"Rescue Points!" All Might boomed. "A secondary metric, hidden from the students! Izuku Midoriya, for risking your life—and your very biology—to save a fellow student, you are awarded sixty Rescue Points!" 

A scoreboard flashed on the screen. Izuku Midoriya was in first place, with eighty-eight points total, beating Katsuki Bakugo’s seventy-seven. 

All Might pointed directly at the camera, his blue eyes piercing through the screen. "You pushed past your limits, young man. You proved that speed isn't just about running away. It's about arriving right when you are needed most. Come, Izuku Midoriya. This is your Hero Academia!" 

The hologram faded. 

Izuku sat in silence. The tears finally spilled over, trailing down his spotted cheeks. He clutched the desk, his claws digging into the wood, sobbing openly. 

He was frail. He was prone to overheating. He couldn't fight for more than a minute. He was a biological contradiction, a predator that destroyed itself if it hunted too hard. 

But he was going to U.A. High School. He was going to be a hero. 

The Spotted Underdog had finally joined the race.

The alarm clock did not stand a chance. 

Before the digital display could even register 5:00 AM, Izuku Midoriya’s eyes snapped open. The vertical, golden slits of his pupils dilated in the dim morning light. His ears—slightly pointed and furred at the tips—swiveled toward the faint, electronic click that preceded the alarm’s shrill ring. With a flick of his wrist, his clawed fingers depressed the snooze button a millisecond before the sound could shatter the quiet of his bedroom. 

He lay there for a moment, staring at the ceiling, his heart beating at a steady, resting rhythm of ninety beats per minute. 

Today is the day, he thought, the reality of it washing over him in a cool wave of disbelief and mounting adrenaline. Today, I become a U.A. student.

Izuku threw off the covers and stretched. It wasn't a normal human stretch. His spine arched deeply, his shoulder blades popping as he extended his arms outward, his claws extending and retracting rhythmically. Behind him, his long, spotted tail uncoiled from where it had been tucked against his leg, giving a lazy swish in the air. 

He swung his legs over the edge of the bed. His feet—elongated, thickly padded, and permanently locked into a digitigrade stance—met the hardwood floor in absolute silence. Moving to the mirror, he inspected himself. Ten months of grueling, specialized training with All Might had not given him the bulging, statuesque muscles of a traditional brawler. Instead, he looked like a tightly coiled spring. He was lean, wiry, and completely devoid of excess body fat. His musculature was highly defined but compressed, built entirely for aerodynamic efficiency and explosive fast-twitch response. A dusting of yellow-gold fur with black spots covered his forearms, calves, and jawline, a permanent reminder of the beast that lived in his DNA. 

He moved to the kitchen, where his mother had already laid out breakfast. For Izuku, breakfast wasn't just a meal; it was fuel management. 

Because his Quirk—the Cheetah mutation—forced his body to operate at such extreme metabolic rates during a sprint, his resting caloric needs were astronomical. He consumed a massive bowl of steamed rice, six eggs, grilled salmon, and a heavily fortified protein shake. 

"Do you have everything, Izuku?" Inko asked, her hands fluttering nervously over her apron. "Your notebooks? Your modified shoes? Your cooling patches?"

"Got it all, Mom," Izuku mumbled around a mouthful of rice. He tapped the small, insulated pouch on his belt. It contained chemical ice packs. If he accidentally pushed his sprint past the forty-five-second mark, those ice packs placed on his neck and under his arms were the only things that would stop his brain from cooking inside his skull. 

After breakfast, he donned his uniform. The traditional U.A. uniform was a symbol of pride, but Izuku had required slight modifications. A reinforced slit in the back of his trousers allowed his tail free movement, essential for his balance. And standard dress shoes were impossible for his feline feet. Instead, the U.A. support company had provided him with specialized, open-toed footwear with thick, shock-absorbing soles that accommodated his raised heels and clawed toes. 

Standing at the front door, he adjusted his red tie. 

"Izuku," Inko said softly. Tears were already welling in her eyes. "I'm so proud of you. Just... please, be careful. Don't push your engine too hot."

Izuku smiled, his sharp canine teeth showing slightly. "I'll be careful, Mom. I promise."

The commute to U.A. High School was a sensory overload. As Izuku navigated the crowded train, his heightened feline hearing picked up a dozen different conversations, the squeal of the wheels on the tracks, the hum of the electrical lines overhead. He kept his tail wrapped securely around his waist like a furry belt to avoid tripping anyone. 

His mind, however, was focused entirely on one person. 

Kacchan. 

Katsuki Bakugo was attending U.A. as well. He had placed second in the Entrance Exam, just behind Izuku, though Bakugo had vastly outscored him in pure combat points. For ten years, Bakugo had mocked Izuku’s fragility. A one-pump chump, Bakugo had called him. A glass cannon. 

Izuku clenched his padded fists. He wasn't the same kid who passed out after five seconds of tag. He had trained. He had strategized. But the biological reality remained: his Quirk was a double-edged sword. If a villain fight lasted longer than a minute, Izuku was as good as dead. He had to prove, not just to Bakugo, but to the U.A. faculty, that his speed was enough.

Stepping off the train and walking up the massive, tree-lined path to U.A. High, Izuku felt a thrill of anticipation. The sheer scale of the building was awe-inspiring. He navigated the labyrinthine hallways, following the signs for the Hero Course first-years. 

Finally, he stopped in front of a door that was comically large, at least twenty feet tall. Painted on the front in bold, red lettering was: 1-A.

This is it, Izuku thought. He took a deep breath, consciously regulating his heart rate down to a calm eighty beats per minute. He reached out and slid the massive door open. 

"Take your feet off that desk this instant!" 

The loud, rigid voice echoed through the classroom. Izuku peeked inside. Standing at the front of the room, chopping his hand through the air like a metronome, was the tall, bespectacled boy from the Entrance Exam—the one with the engine pipes protruding from his calves. 

Sitting at the desk, leaning back with a look of utter disdain, was Katsuki Bakugo. His feet were planted firmly on the polished wood. 

"It’s an insult to the upperclassmen who used this desk before us, and an insult to the craftsmen who made it!" the tall boy declared, adjusting his glasses. 

"Hah?" Bakugo scoffed, a feral grin spreading across his face. "Are you kidding me? Which middle school did you go to, you extra?"

"I am Tenya Iida, from Somei Private Academy!" 

"Somei? So you're a damn elite, huh?" Bakugo sneered, small sparks popping from his palms. "I'm gonna have fun crushing you."

Iida gasped, taking a step back. "Crushing me? Are you truly aiming to be a hero?"

Izuku stood frozen in the doorway, his tail twitching nervously. Great. The two most intense people in the room are already fighting. 

Before Izuku could back away, Iida’s head snapped toward the door. The tall boy’s eyes widened, and he immediately abandoned his argument with Bakugo, marching straight toward Izuku with purposeful, heavy strides. 

Bakugo glanced over, his crimson eyes locking onto Izuku. The arrogant smirk vanished, replaced by a scowl of pure, unadulterated venom. "Deku," he growled. 

Izuku ignored Bakugo, bracing himself as Iida stopped right in front of him. 

"You!" Iida said loudly, bowing at a perfect ninety-degree angle. "I am Tenya Iida! I must apologize to you!"

"A-Apologize?" Izuku stammered, his ears flattening against his hair. 

Iida stood up straight, his gaze intensely focused. "During the Entrance Exam, I reprimanded you for your muttering. I thought you were a distraction. But I was blind! I watched you during the practical exam. You realized there was a hidden rescue metric, didn't you? You saw the true nature of the test while I ran away from the Zero-Pointer like a coward!" 

Izuku rubbed the back of his neck, his tail swaying in embarrassment. "Actually, Iida-kun, I didn't know about the rescue points at all. My body just... moved on its own when I saw someone in trouble."

Iida stared at him, seemingly even more impressed. "Instinctive heroism! The truest mark of a pro!" Then, Iida’s gaze dropped. He looked critically at Izuku’s digitigrade legs, the thick padding of his feet, and the muscular, counter-balancing tail. 

"A heteromorphic physiology highly optimized for kinesthetic acceleration," Iida muttered, his eyes gleaming with a sudden, intense competitive fire. He tapped the chrome exhaust pipes on his own calves. "My Quirk is Engine. I pride myself on my speed. When I saw you move during the exam, I realized something." Iida thrust a hand out. "We are of the same archetype, Midoriya. You are my direct rival!"

Izuku blinked. A rival? Someone wasn't looking down on him or calling him fragile; someone was acknowledging his speed as a threat. Izuku smiled, taking Iida’s hand. His grip was light—his hollow bones didn't allow for a crushing handshake—but it was firm. "I look forward to learning with you, Iida-kun." 

"Hey! It's the boy with the tail and the spots!" 

Izuku turned to see Ochaco Uraraka bounding through the door, her face lighting up with a brilliant smile. "I've been looking for you! I never got to properly thank you for saving me!"

Izuku’s face flushed a deep crimson. His tail betrayed him, immediately curling inward and wrapping tightly around his leg in a display of acute shyness. "I-It was nothing! R-Really! I just... swoosh, and grab, and jump!" he pantomimed wildly, his pointed ears swiveling in every direction but hers. 

Uraraka laughed, a bright, bubbly sound. "You were like a lightning bolt! I went to the teachers to try and give you my points, but they said you already passed! I'm so glad we're in the same class!"

"If you're just here to make friends, you can pack up your things and leave."

The voice was rough, flat, and chillingly devoid of emotion. 

Izuku, Iida, and Uraraka froze. They looked down the hallway. Lying on the floor in a bright yellow sleeping bag, looking like an overgrown, dehydrated caterpillar, was a haggard-looking man with messy black hair and heavy bags under his eyes. 

The man unzipped the sleeping bag, stood up, and pulled out a juice pouch. He took a slow sip, his dark, calculating eyes scanning the room. 

Who is this guy? Izuku's mind raced. He looks exhausted. But his posture... he's perfectly balanced. He's a pro hero. But I don't recognize him.

"It took you lot eight seconds to quiet down," the man said, stepping into the classroom. "Time is limited. You kids are not rational enough."

He walked to the podium, dropping a pile of gym uniforms onto it. "I'm your homeroom teacher, Shota Aizawa. Nice to meet you."

The class stared in stunned silence. A homeroom teacher? This homeless-looking man?

Aizawa didn't wait for them to process it. He pulled a blue and white jumpsuit from the pile. "Wear these. Then head out to the P.E. grounds. We're doing a Quirk Apprehension Test."

The sun was already beating down on the sprawling dirt field of the P.E. grounds. For Izuku, the heat was uncomfortable. His body naturally ran hot, and the U.A. track uniform, while breathable, lacked the specialized liquid-cooling system All Might had promised to incorporate into his hero costume. 

"A Quirk Apprehension Test?!" the class echoed in unison. 

Uraraka stepped forward, her brow furrowed. "But what about the entrance ceremony? Or orientation?"

"If you're going to become a hero, you don't have time for such leisurely events," Aizawa said, his back turned to them as he read a clipboard. "U.A.'s selling point is how unrestricted its school traditions are. That's also how the teachers run their classes."

Aizawa turned to face them, his gaze heavy and oppressive. "You kids have been doing these standardized tests since junior high. Fifty-meter dash, softball throw, grip strength. But you were never allowed to use your Quirks. The country is still trying to pretend we are all created equal by dragging down those with outstanding abilities. It's not rational."

He pointed a finger at Bakugo. "Bakugo. You finished first in the practical exam. In junior high, what was your best result for the softball throw?"

Bakugo stepped out of the group, looking bored. "Sixty-seven meters."

"Try doing it with your Quirk." Aizawa tossed him a standard softball. Bakugo caught it, stepping into the chalk circle drawn on the field. "You can do whatever you want as long as you stay in the circle. Hurry up. Give it all you've got."

Bakugo smirked, rolling his shoulders. "You asked for it."

He wound his arm back. Izuku watched closely, his feline eyes tracking the subtle shift in Bakugo’s musculature. He's going to use the blast to maximize initial velocity, Izuku analyzed. But his shoulder joint has to withstand the recoil.

"DIE!" Bakugo roared. 

He threw the ball, unleashing a massive, deafening explosion from his palm at the exact moment of release. The concussive wave washed over the class. Izuku felt the heat on his fur, his ears flattening against the loud boom. 

The ball shot into the sky like a rocket, leaving a trail of black smoke. 

Aizawa held up a small tracking device. It beeped. He turned the screen toward the class. 

705.2 meters.

The class erupted. 

"Seven hundred meters?! Are you kidding me?!"

"That looks like so much fun!"

"We can finally use our Quirks as much as we want!"

Aizawa's expression darkened. The atmosphere instantly plummeted from excited to suffocating. 

"Fun?" Aizawa whispered. "You have three years to become heroes. Are you going to have an attitude like that the whole time?" He smiled, but it was a terrifying, predatory grin. "All right. Whoever comes in last place in all eight tests will be judged to have no potential, and will be punished with expulsion."

The word hung in the air like a guillotine blade. 

"Expulsion?!" Uraraka cried out. "But it's the first day! That's not fair!"

"Natural disasters, massive accidents, and selfish villains. Calamities whose time or place cannot be predicted," Aizawa countered, his voice cold and rational. "Japan is covered with unfairness. Heroes are the ones who reverse those situations. If you wanted to go talk to your friends at McDonald's after school, too bad. For the next three years, U.A. will do all it can to give you one hardship after another. Go Plus Ultra. Overcome it with all you've got."

Izuku felt a cold sweat break out on the back of his neck. 

Eight tests, he thought, panic beginning to bubble in his chest. Fifty-meter dash. Long jump. Grip strength. Repeated side steps. Softball throw. Distance run. Sit-ups. Seated toe-touch.

His mind raced through the physics of his own body. He would dominate the dash and the long jump. His digitigrade legs were built exactly for that. But grip strength? He had hollow, lightweight bones; he couldn't squeeze with massive force without breaking his own fingers. The ball throw? He couldn't throw like Bakugo. 

But the absolute worst was the distance run. 

A distance run is an endurance test, Izuku realized, his heart rate spiking to 110 BPM just from anxiety. If I run at a normal human pace, I'll get an average score. If I use my Quirk, I'll finish a mile in a minute, but my core temperature will spike to forty degrees. I'll overheat and stroke out before the test is even halfway done. 

He looked at Aizawa. The teacher’s eyes were locked directly on him, analyzing his mutation. Aizawa knew. Aizawa knew exactly what Izuku’s weakness was, and this test was designed to expose it. 

"Test one," Aizawa announced. "Fifty-meter dash."

The class moved to the track. Aizawa set up a series of electronic timing gates. 

"First up. Iida Tenya and Tsuyu Asui."

Iida stepped up to the starting line, adjusting his glasses. Beside him, a girl with a distinct frog-like mutation crouched down low. 

"On your marks," a robotic voice announced from the timing machine. 

Iida dropped into a sprinter's stance. The chrome pipes on his calves suddenly roared to life, shooting blue flames. 

"Go!" 

With a deafening roar of engines, Iida shot down the track. He crossed the finish line in a blur of motion. 

"3.04 seconds," the machine announced. 

The class murmured in awe. Iida stood at the finish line, cooling his engines, looking highly satisfied. "Well, my engines only have three gears, so getting into top gear over fifty meters is difficult, but an acceptable result."

He turned, his eyes searching the crowd. He locked eyes with Izuku. It was a silent challenge. 

He's incredibly fast, Izuku noted, watching the residual smoke clear from Iida’s legs. His Quirk provides continuous propulsion, meaning he doesn't suffer the same muscular fatigue as a biological sprinter. But his initial acceleration is mechanical. It takes time to cycle up to top gear. 

"Next. Midoriya Izuku and Bakugo Katsuki."

The tension in the air was palpable as Izuku stepped up to the line. Bakugo walked up beside him, cracking his knuckles. The blond boy didn't even look at him, but the sneer on his face spoke volumes. 

"Don't think you can show off, Deku," Bakugo muttered, his palms already smoking. "I'm going to blow you out of the water."

Izuku didn't respond. He didn't drop into a traditional track stance. Instead, he dropped all the way down to all fours. 

A murmur rippled through the class. 

"Is he... going on all fours?" a boy with spiky red hair asked. 

Izuku placed his clawed fingers flat on the starting line. He shifted his weight backward, loading the immense kinetic potential into his digitigrade legs. His long tail whipped out straight behind him, acting as a counterbalance. 

He closed his eyes, engaging the breathing technique All Might had taught him. Inhale sharp, exhale heavy. Saturate the blood with oxygen. 

He felt the dormant energy in his DNA awaken. The transformation aspect of his Quirk fully activated. The fur on his arms bristled. His golden eyes snapped open, the pupils dilating into wide, predatory ovals. The world around him seemed to slow down. The sound of Bakugo’s breathing, the rustle of the leaves, the hum of the timing machine—it all became razor-sharp. 

"On your marks."

Bakugo raised his hands behind his back, preparing to use explosions to propel himself forward. 

"Go!" 

BOOM. Bakugo blasted off the line, rocketing forward with a trail of fire. 

But Izuku was already gone. 

He didn't need to cycle up to top gear. His anatomy provided instantaneous, explosive acceleration. When his legs fired, the force cracked the hard dirt of the track. His first stride covered five meters. His spine acted like a massive spring, coiling and uncoiling, driving his knees forward with terrifying speed. His claws dug into the earth, providing perfect traction. 

To the rest of the class, Izuku was nothing but a yellow-and-black blur, a gust of wind that kicked up a massive cloud of dust. 

He didn't even register Bakugo's explosions next to him. Izuku blew past the finish line, immediately dropping his weight and skidding to a halt, his claws carving deep trenches into the dirt as his tail whipped around to absorb the rotational force. 

"3.10 seconds," the machine announced. 

Silence fell over the track. 

Iida’s jaw dropped. "Three point one zero... He nearly matched my engine, and he used purely biological muscle!"

Bakugo crossed the line a moment later. "4.13 seconds." 

Bakugo stared at the digital readout, his crimson eyes trembling with rage. He snapped his head toward Izuku. Izuku was already standing up, panting slightly, his chest rising and falling rapidly as he expelled the initial burst of heat. 

"You..." Bakugo growled, his hands sparking wildly. "What the hell was that, Deku?!"

Before Bakugo could lunge, Aizawa's capture weapon shot out, wrapping tightly around Bakugo’s torso. Aizawa’s eyes were glowing red, his hair defying gravity. 

"Stop using your Quirk in anger, Bakugo, or I will expel you right now," Aizawa threatened, his voice dropping to a dangerous register. Bakugo froze, clicking his tongue and pulling away as the bindings loosened. 

Aizawa looked at his clipboard, marking down Izuku’s time. Incredible initial velocity, Aizawa thought. He moves faster than the eye can track over short distances. But look at him. 

Izuku’s face was flushed. He was taking deep, gulping breaths. It had only been three seconds of sprinting, but the thermodynamic toll was already beginning. 

"Next test," Aizawa called out. "Grip strength."

The high of the 50-meter dash faded brutally fast for Izuku. 

In the grip strength test, a massive, multi-armed boy named Mezo Shoji squeezed the machine until it read an astounding 540 kilograms. 

Izuku took the device. He squeezed as hard as he could, his claws digging into the plastic casing. His forearm muscles strained, but they were built for rapid contraction, not crushing pressure. Furthermore, he knew that if he squeezed with his absolute maximum effort, his hollow, lightweight finger bones would snap under the tension of his own tendons. 

The machine beeped. 42 kg.

Below average. 

Bakugo, watching from afar, scoffed loudly. 

Next was the standing long jump. Izuku excelled here. Using his powerful legs, he leaped from the starting line and completely cleared the sandbox, landing softly on the grass on the other side. 

Then came the repeated side steps. A short boy with purple balls for hair, Minoru Mineta, dominated this test by bouncing between his own sticky spheres. Izuku attempted to use his rapid acceleration, but the constant starting and stopping, the lateral shearing force on his ankles, caused an immediate spike in his body temperature. He scored well above average, but he stumbled away from the test dizzy and sweating profusely. 

Then came the nightmare. The endurance run. 

"Four laps around the perimeter of the P.E. grounds," Aizawa announced. "Pace yourselves. Or don't."

The whistle blew. 

A boy with half-white, half-red hair immediately created a path of ice, sliding forward effortlessly. A girl named Yaoyorozu created a pair of roller skates. Iida took off at a steady, rhythmic jog, his engines humming at a low, sustainable gear. 

Izuku started running. 

He didn't sprint. He couldn't. If he sprinted, he would cover the distance in thirty seconds, but he would pass out before the final lap. So, he forced himself to jog like a normal human. 

But Izuku was no longer a normal human. 

His body was not designed for a slow, steady jog. His enlarged heart and massive lungs were demanding high output, but his slow pace was confusing his nervous system. Worse, without the wind resistance of a full sprint to aid in convection cooling, the heat generated by his muscles began to pool in his core. 

By the end of the second lap, Izuku was in hell. 

His vision was swimming with black spots. His fur was matted with sweat, but unlike humans, his sweat glands were poorly distributed. The air felt like thick, boiling water entering his lungs. His digitigrade legs, designed to act as explosive springs, ached with the dull, repetitive impact of the slow jog. 

Hot, he thought, his mind going hazy. Too hot. Ice... I need ice. 

He stumbled, his foot catching on the dirt track. He went down hard, tumbling into the grass. 

"Midoriya!" Iida called out, slowing his pace as he jogged past. "Are you alright?!"

"I'm... fine..." Izuku wheezed, struggling to push himself up on shaking arms. His core temperature was reading dangerously high. His internal thermostat was screaming at him to lie down and sleep in the shade. 

He managed to finish the run, coming in near the very bottom of the pack. When he crossed the finish line, he immediately collapsed against the fence, tearing open his belt pouch and frantically pressing the chemical ice packs against his carotid arteries and the back of his neck. 

Aizawa stood a few feet away, watching him with cold, calculating eyes. 

"You have a massive fatal flaw, Midoriya," Aizawa said quietly, ensuring only Izuku could hear him. 

Izuku flinched, looking up at the teacher through a haze of exhaustion. 

"Your sprint is peerless. But your endurance is practically nonexistent," Aizawa stated, writing something on his clipboard. "You have about thirty to forty-five seconds of top speed before your engine melts down. Your bones are too fragile for prolonged hand-to-hand combat, and your body can't regulate its own temperature under stress."

Aizawa leaned down, casting a dark shadow over Izuku. "Tell me, Midoriya. What happens on minute two of a villain fight?"

Izuku felt a cold knot form in his stomach, contrasting violently with his overheated blood. 

"If the villain isn't defeated in the first strike," Aizawa continued relentlessly, "you become a liability. You become a victim. And another hero will have to risk their life to save yours. A glass cannon is useless if it shatters after the first shot."

Aizawa stood up. "Next test. The softball throw."

Izuku slowly got to his feet. His legs were shaking. His head throbbed. Aizawa’s words echoed in his mind, deafening and terrifying. Expulsion. Last place is expelled. 

He watched as Uraraka stepped up to the circle. She tapped the ball, wound up, and threw it. The ball sailed into the sky and simply never came down. 

Aizawa held up the tracker. The screen read an infinity symbol. 

The class cheered, but Izuku felt like he was suffocating. He looked at his hands. His claws were sharp, but his arms lacked the dense muscle mass required to throw a ball a great distance. He had scored high on the dash and the long jump, but his terrible grip strength and abysmal distance run were dragging his average down. If he didn't score high on the throw, he would be last. He would be expelled. 

"Midoriya," Aizawa called out. "You're up."

Izuku walked to the chalk circle. Every eye was on him. Bakugo was smirking, crossing his arms. Iida looked concerned. Uraraka gave him a supportive thumbs-up. 

Izuku stared at the softball in his hand. 

I need distance, he thought desperately. If I throw it normally, I'll maybe get fifty meters. If I use my Quirk... my Quirk gives me speed. It enhances my fast-twitch muscles. But it doesn't give me arm strength. If I try to snap my arm forward with the full force of my Quirk, the torque will shatter my humerus and snap my rotator cuff. 

He closed his eyes. What would All Might say? Optimize your biomechanics. Use your whole body.

Izuku gripped the ball tightly. He activated his Quirk. He felt the familiar, burning surge of adrenaline. The fur on his arms bristled. His pupils slitted. 

He didn't wind his arm back. Instead, he dropped the ball toward the ground. In a fluid, deeply unorthodox motion, he whipped his long, muscular tail forward, wrapping the prehensile appendage securely around his wrist and the ball. 

"What is he doing?" someone whispered. 

Izuku didn't step forward to throw. Instead, he began to spin. 

He utilized his digitigrade legs to pivot flawlessly on the balls of his padded feet. One rotation. Two rotations. He was building centripetal force, like an Olympic hammer thrower. 

Faster, Izuku thought. 

Three rotations. Four. He became a blur, a localized tornado of yellow and black. The kinetic energy building in his spinning form was immense. His tail acted as an extension of his arm, increasing the lever arm and multiplying the torque exponentially. 

Now! 

He prepared to release the ball, intending to channel the absolute maximum output of his Quirk into the final snap of his wrist. 

Suddenly, the world went gray. 

The burning adrenaline in his veins vanished. The predatory sharpness in his vision dulled. The hyper-responsive fast-twitch muscle fibers in his arm went slack. 

Izuku stumbled, his momentum completely broken. He released the ball, but without the explosive, Quirk-enhanced snap, it just flopped out of his hand, rolling pathetically across the grass. 

46 meters.

Izuku froze, his chest heaving. He looked at his hands. His claws were still there. His tail was still there. His digitigrade legs were still there. But the power—the active transformation aspect of his Quirk that allowed him to break the sound barrier—was gone. He felt heavy, sluggish, like a normal human trapped in a mutant's body. 

He turned around. 

Aizawa was glaring at him. His capture weapon was floating around his neck like a nest of angry vipers. His goggles were pushed up, and his eyes were glowing a piercing, demonic red. 

"I erased your Quirk," Aizawa said, his voice cutting through the silence of the field. 

The class gasped. 

"Erased?" Izuku breathed, his analytical mind struggling to catch up. "But... my Quirk is a mutation. You can't erase a tail."

"I cannot erase heteromorphic limbs," Aizawa corrected coldly. "But your Quirk is a hybrid. A mutation of the body, combined with an active, transformative metabolic state. I erased the engine. I shut down the active power you were about to pump into that throw."

Aizawa took a step forward, the capture weapon undulating menacingly. "I saw what you were trying to do, Midoriya. You were going to use centripetal force combined with a 100% output burst of your Quirk to launch that ball. It was a clever application of physics."

Aizawa’s eyes narrowed. "But tell me. With your fragile skeletal structure, what would have happened to your arm if you had unleashed that much torque?"

Izuku swallowed hard. "The... the centrifugal force combined with the sudden deceleration of the release... it would have dislocated my shoulder. It might have snapped my ulna."

"Exactly," Aizawa snapped. "You were about to shatter your own arm just to get a good score on a test. You were going to render yourself incapacitated. Again, I ask you: What happens on minute two when your arm is broken and your engine is overheated?"

Aizawa stepped into the circle, towering over Izuku. "You are reckless. You rely on self-destructive bursts of power because you haven't figured out how to sustain yourself. If this were a real battle, you would be dead, and the people you were trying to save would die with you. With that kind of suicidal power management, you cannot become a hero."

Aizawa blinked. His hair fell, and his eyes returned to normal. 

Instantly, Izuku felt the heat and the predatory edge rush back into his system. His ears twitched. His tail flicked nervously. 

"I've returned your Quirk," Aizawa said, turning his back. "You have one more throw. Do it properly, or pack your bags."

Izuku stood in the circle, staring at the ground. 

He's right, Izuku thought, his heart pounding a frantic 150 BPM. I was going to break my arm. I'm so desperate to prove I'm not useless that I'm willing to destroy myself. That's not what All Might taught me.

He picked up the softball. 

I can't use 100% of my Quirk's strength in my arm. My bones can't take it. And I can't just throw it normally. I need to use my speed, but I need to protect my body. 

Izuku’s eyes widened. Protect my body. Distribute the impact. 

He looked at his tail. It was thick, muscular, and incredibly dense—the strongest appendage on his body, designed to act as a rudder during high-speed, high-G-force turns. It didn't have hollow bones like his arms. It was built of dense cartilage and thick muscle fiber. 

"Aizawa-sensei," Izuku called out. "As long as I stay in the circle, anything goes, right?"

Aizawa glanced over his shoulder, his expression unreadable. "That's what I said."

Izuku walked to the absolute back edge of the chalk circle. The circle was roughly seven feet in diameter. It wasn't a lot of space, but for a cheetah, it was enough to generate momentum. 

He didn't hold the ball in his hand. Instead, he tossed it into the air, caught it with the prehensile tip of his tail, and wrapped it securely. 

Bakugo frowned. "What the hell is he doing? Playing hacky sack?"

Izuku dropped to a low crouch. He engaged his breathing technique, hyper-saturating his blood with oxygen. His eyes slitted. His fur bristled. 

He didn't spin this time. Instead, he lunged forward. 

Using the full seven feet of the circle, Izuku accelerated. In a single, explosive stride, he went from zero to forty miles per hour. As he reached the front edge of the circle, he planted his digitigrade feet perfectly, arresting his forward momentum instantly. 

The kinetic energy had to go somewhere. 

Izuku violently twisted his hips, using the momentum to whip his entire body around. He channeled 100% of his Quirk's output not into his fragile arm, but into the dense, muscular base of his tail. 

He lashed his tail forward like a medieval siege engine. The appendage broke the sound barrier with a resounding CRACK, snapping like a bullwhip. At the apex of the arc, his tail uncoiled, releasing the ball. 

The ball vanished. 

There was no trail of smoke like Bakugo’s, only the violent rush of displaced air that rustled the uniforms of the students standing twenty feet away. 

Izuku collapsed onto one knee, panting heavily. His tail throbbed with a dull ache, but nothing was broken. His core temperature spiked, but it was manageable. He immediately pressed an ice pack to his neck. 

He looked up at Aizawa. 

Aizawa stood perfectly still, his eyes locked on the sky. The tracking device in his hand beeped rapidly. 

Aizawa turned the screen around. 

705.3 meters. 

Exactly 0.1 meters farther than Bakugo. 

The class was stunned silent. 

"Over seven hundred meters?!" the red-haired boy, Kirishima, yelled. "He didn't even use his hands!"

"A biomechanical slingshot maneuver," Iida gasped, adjusting his glasses furiously. "He used the length of the circle to generate forward velocity, abruptly halted to transfer the kinetic energy into rotational torque, and used his tail to safely discharge the force! Brilliant!"

Aizawa stared at Izuku. A small, almost imperceptible smirk tugged at the corner of the tired teacher's mouth. 

He adapted, Aizawa thought. He recognized his physical limitations, utilized a localized burst of speed rather than a sustained output, and found a way to weaponize his mutation without destroying himself. He desperately needs a highly engineered support suit to manage his heat, but... he has potential. 

"Aizawa-sensei," Izuku panted, looking up with a fierce, unwavering glare in his golden eyes. "My engine... is still running."

Before Aizawa could respond, a roar of pure, unfiltered fury shattered the moment. 

"DEKU!" 

Izuku turned just in time to see Bakugo charging at him. Bakugo’s face was contorted in absolute rage, his palms crackling with massive, lethal explosions. 

"You bastard!" Bakugo screamed, propelling himself forward with a blast. "Tell me how you did that! You've been hiding a strength Quirk this whole time?! You've been making a fool out of me?!"

Bakugo lunged, swinging a right hook aimed directly at Izuku's face. 

The class screamed. Iida moved to intercept, but he was too far away. 

Izuku didn't flinch. 

To Izuku's hyper-accelerated perception, Bakugo’s punch was telegraphed, wide, and sluggish. Izuku didn't need to block it. He knew blocking an explosion would shatter his forearms. 

Instead, he simply shifted his weight. 

With a twitch of his powerful legs, Izuku side-stepped. He moved so fast that Bakugo’s fist phased through the afterimage of Izuku's form. Bakugo stumbled forward, completely missing his target, carried by his own unguided momentum. 

Before Bakugo could recover and turn, thick gray cloth wrapped around his torso, pulling him taut and lifting his feet off the ground. 

Aizawa stood ten feet away, his capture weapon deployed, his eyes glowing red once again. Bakugo’s explosions fizzled out instantly. 

"What the... let me go!" Bakugo thrashed, fighting against the binding. "Why is this cloth so damn hard?!"

"It's a carbon fiber woven with a special metal alloy," Aizawa said coldly, tugging the weapon tighter. "Stand down, Bakugo. Or I will expel you for attacking a fellow student."

Bakugo gnashed his teeth, glaring at Izuku with a hatred that burned hotter than his explosions. But he stopped struggling. 

Aizawa blinked, deactivating his Quirk, and unraveled the cloth. "We're wasting time. Whoever is finished with the tests, head back to the classroom."

An hour later, the tests were complete. The class stood nervously before a large holographic projection Aizawa had summoned from his tablet. 

"I'm going to show the results all at once," Aizawa said. "It's a total of your scores across all eight tests."

Izuku squeezed his eyes shut. His tail wrapped tightly around his leg. Please. Not last. I can't be last.

He opened his eyes and scanned the list. 

1. Yaoyorozu Momo

2. Todoroki Shoto

3. Bakugo Katsuki

4. Iida Tenya

...

9. Midoriya Izuku

...

20. Mineta Minoru

Izuku let out a breath he felt like he had been holding for ten years. Ninth place. His incredible scores in the dash, the long jump, and the ball throw had completely offset his terrible performance in the grip strength and endurance run. 

He was safe. 

"By the way," Aizawa said, putting his tablet away. "I was lying about the expulsion."

The entire class froze. 

"It was a rational deception to draw out the upper limits of your Quirks." Aizawa smiled, a chilling, shark-like expression. 

"WHAT?!" the class yelled. 

Yaoyorozu sighed, shaking her head. "Of course it was a lie. It was obvious if you just thought it through."

I didn't think it through at all, Izuku thought, trembling. I thought I was dead.

As the class dispersed to head to the locker rooms, Izuku felt a heavy hand on his shoulder. He turned to see Aizawa looking down at him. 

"It wasn't a total lie, Midoriya," Aizawa said softly. "If you had broken your arm on that throw, I would have expelled you on the spot. Self-destruction is not heroism."

Izuku nodded, swallowing hard. "I understand, Sensei. I... I have a lot to learn about managing my heat and my bones."

"Go to the Support Company lab tomorrow," Aizawa instructed, turning to walk away. "Tell Power Loader that Aizawa sent you. You need a liquid-cooled undersuit and impact-dampening gauntlets immediately, or you won't survive the combat simulations."

Izuku watched his teacher walk away, a profound sense of gratitude washing over him. 

Later, as the sun began to set over U.A. High, Izuku walked toward the front gates. His muscles ached. His throat was dry. But for the first time in his life, he didn't feel useless. 

"Midoriya!" 

Izuku turned. Iida was jogging toward him, his backpack slung over one shoulder. A moment later, Uraraka caught up with them. 

"Are you going to the station?" Iida asked, his posture rigid but friendly. "I would like to accompany you."

"Yeah, me too!" Uraraka smiled. "You were amazing today, Deku!"

Izuku blinked. "Deku? H-How did you know that name?"

"During the fitness test, that angry boy with the explosions kept calling you Deku," Uraraka pointed out, tilting her head. "Is it your nickname?"

Izuku’s ears drooped. "Well... Kacchan calls me that to make fun of me. It means 'useless.' Because I always run out of stamina."

"Really?" Uraraka frowned. "But you're not useless at all! When I hear 'Deku,' it sounds like 'You can do it!' It has a really encouraging ring to it!"

Izuku’s face instantly turned the color of a tomato. His tail shot straight up into the air, completely stiff. "Deku is fine! Deku is a great name!"

Iida chopped his hand through the air. "Midoriya! I must formally declare my intentions! Today, you proved that biological speed can match mechanical speed. But I will not lose to you in our future training! I challenge you to a race once we get our hero costumes!"

Izuku looked at Iida's intense expression, and then at Uraraka's bright smile. He thought of Bakugo's burning rage, and Aizawa's cold, rational advice. 

He wasn't a brawler. He was a sprinter. He was fragile, and he overheated easily. He was a glass cannon. 

But as he walked out of the U.A. gates with his first true friends, Izuku Midoriya smiled, his golden eyes glowing in the twilight. 

I might only have a minute of top speed, Izuku thought. But I'll make sure it's the fastest minute the world has ever seen.

The hum of the Support Company laboratory was a soothing white noise, a steady mechanical drone that smelled of ozone, machine oil, and soldering iron. For Izuku Midoriya, it was the sound of salvation. 

He sat on a cold, steel examination table, his spotted tail flicking nervously behind him. Standing in front of him was Majima Higari, the pro hero Power Loader, who was currently examining a thermal imaging scan of Izuku’s body on a holographic display. 

"Eraserhead wasn't kidding," Power Loader muttered, adjusting his heavy, excavator-like helmet. "Your metabolic rate during a sprint is absurd. You generate enough internal heat to boil water in under a minute. If you were a machine, your engine block would have melted out of your chassis years ago."

"I... I try to manage my breathing," Izuku offered meekly, his feline ears drooping. "And I carry ice packs."

"Ice packs are for sprained ankles, kid, not for a core temperature of forty-one degrees Celsius," Power Loader sighed, pulling up a new schematic on the screen. "You have the biological makeup of a hyper-predator, but you're trying to operate in sustained, urban combat environments. You need a radiator."

The schematic rotated, displaying a sleek, heavily engineered body suit. 

"I took the liberty of looking over the costume design you submitted to U.A. before the entrance exam," Power Loader said. "It was a good baseline, but the materials were all wrong for your Quirk. You wanted standard kevlar. Kevlar traps heat. If you wore that, you'd roast yourself alive."

Power Loader pressed a button, and a mechanical arm descended from the ceiling, carrying a specialized garment on a hanger. 

"This is the apex of thermoregulatory support gear," Power Loader announced, a hint of pride in his gruff voice. "The undersuit is woven from a proprietary, breathable micro-mesh. Woven directly into the fabric are hundreds of microscopic capillary tubes filled with a highly volatile, non-toxic liquid coolant—similar to liquid freon. When your body temperature spikes, the suit detects it and actively pumps the coolant through the mesh, pulling the heat away from your vital organs and venting it out through these exhaust ports on the shoulders and lower back."

Izuku stared at the suit, his vertical pupils widening in awe. It was a deep, muted forest green, accented with matte black plating. "It's... incredible. But won't the pumps and the fluid weigh me down? My bones are hollow. I can't carry a lot of weight."

"That’s the beauty of it," a manic, hyper-energetic voice chimed in from under a nearby workbench. 

Izuku yelped as a girl with wildly dreadlocked pink hair and crosshair eyes suddenly rolled out on a mechanic's creeper, holding a blowtorch. 

"Hatsume, I told you to stay on your side of the lab!" Power Loader barked. 

Mei Hatsume ignored him, springing to her feet and marching right up to Izuku, invading his personal space. She poked his arm, examining his fur. "The whole cooling system, fully loaded, weighs less than three pounds! I designed the micro-pumps myself! They run off the kinetic energy you generate when you run! The faster you move, the harder the suit cools you! It’s a self-sustaining thermodynamic loop! My babies are flawless!"

"She's eccentric, but she's right," Power Loader groaned, rubbing his temples. "The suit will buy you time. But listen to me, Midoriya: it is not magic. It has a limited reservoir of coolant. If you run at absolute top speed, you will eventually vaporize the entire supply. And when the tank is empty, you're back to relying on your own biology. It turns your forty-five-second limit into a five-minute limit. Use those five minutes wisely."

Power Loader tapped the boots attached to the suit. "I also modified the footwear. Your digitigrade legs make standard boots impossible. These are open-toed to allow your claws free movement for traction, but the soles are reinforced with highly compressible shock-absorbing gel. They will dampen the impact on your fragile joints, and more importantly, they are completely soundproof. You’ll be quieter than a ghost."

Izuku hopped off the table, reaching out to touch the sleek green fabric. A rush of profound gratitude overwhelmed him. His whole life, his body had been a cage of limitations, a weapon that hurt its wielder. But here, in this school, they weren't telling him to give up. They were giving him the tools to survive. 

"Thank you," Izuku whispered, his tail wrapping around his leg. "I won't let your work go to waste."

The next afternoon, Class 1-A stood in the staging area of Ground Beta, a massive, meticulously constructed faux-city used for urban combat training. 

"THEY SAY THE CLOTHES MAKE THE MAN, YOUNG MEN AND WOMEN!" 

All Might’s booming voice echoed off the concrete walls. He stood before the class in his Golden Age hero costume, a towering mountain of muscle and charisma. "BE FULLY AWARE... FROM NOW ON, YOU ARE HEROES!"

Izuku stepped out of the tunnel, adjusting the collar of his new suit. The fit was absolutely perfect, hugging his lean, wiry frame without restricting his range of motion. The deep green mesh was segmented by matte black panels over his chest and thighs. The liquid-cooling tubes were subtly integrated, giving the suit a faint, high-tech geometric pattern. His modified boots wrapped securely around his elevated heels and ankles, leaving his thick paw-pads and claws exposed to the concrete. He wore a specialized dark metallic mouth-guard that acted as a respirator, and the shoulder vents hummed with a barely audible, soothing vibration. 

"Whoa, Deku! You look so cool!" 

Izuku turned to see Uraraka jogging toward him. Her own costume was a sleek, bubble-gum pink and black spacesuit with thick, rounded bracers and boots. 

Izuku’s face flushed beneath his respirator. His tail gave an involuntary, rigid wag. "T-Thanks, Uraraka-san! Yours is really, um, functional! The pressure points on the wrists to help with your Quirk's nausea, right?"

"Yup!" Uraraka beamed, though she tugged at her waistline slightly. "I should have specified the fit, though. It's a little skintight..."

"It looks highly practical for aerodynamic maneuvering!" Iida declared, marching over. His costume was a towering suit of pristine white armor, looking like a cross between a knight and a high-end sports car, complete with exhaust pipes seamlessly integrated into the greaves. 

As the class admired each other's outfits, Izuku felt a heavy, oppressive glare drilling into the back of his neck. 

His feline ears swiveled backward, catching the sound of heavy, aggressive footsteps. He turned his head. 

Katsuki Bakugo emerged from the tunnel. His costume was intensely intimidating—a black, sleeveless, v-neck tank top with an orange X across the center, massive steel knee pads, and most prominently, giant, grenade-shaped gauntlets encasing his forearms. 

Bakugo locked eyes with Izuku. The blond boy's crimson eyes were narrowed into slits of pure, unadulterated hostility. There was no trash talk today. There was only a silent, burning promise of violence. 

He's still furious about the Quirk Apprehension Test, Izuku realized, his heart rate ticking up from a calm eighty to a nervous one hundred beats per minute. He thinks I lied to him our whole lives. He wants to prove he's superior.

"NOW THEN, IT'S TIME FOR COMBAT TRAINING!" All Might announced, pulling a script out of his pocket. 

"Sir!" Iida raised his hand rigidly. "This is the battle center from the entrance exam. Will we be conducting urban mock battles again?"

"NO! WE WILL BE MOVING TWO STEPS AHEAD!" All Might flashed a brilliant smile. "Most villain fights you see on the news take place outside. However, statistically, heinous villains are more likely to appear indoors! Imprisonment, house arrest, black market deals—in this hero-saturated society, truly intelligent villains hide in the shadows!" 

All Might held up two small boxes. "For this class, you'll be split into villains and heroes and fight two-on-two indoor battles! The villains will guard a nuclear weapon hidden somewhere in the building. The heroes must either apprehend the villains or secure the weapon within the time limit! We will draw lots to determine teams!"

Izuku reached into the box. He pulled out a small wooden ball with the letter 'A' painted on it. 

"I'm Team A," Uraraka said happily, holding up a matching ball. "We're a team, Deku!"

Izuku’s nerves instantly vanished, replaced by a surge of warmth. "Wow! That's great, Uraraka-san. We work well together."

"I am Team D," Iida announced. 

"Tch. Me too," Bakugo sneered, holding up his own 'D' ball. Iida looked thrilled; Bakugo looked like he wanted to murder the wooden sphere. 

All Might reached into two separate boxes marked 'Hero' and 'Villain'. He pulled out two balls. 

"THE FIRST TEAMS TO FIGHT WILL BE... THESE GUYS!" 

All Might held up the letters. 

Team A (Heroes) vs. Team D (Villains).

The breath caught in Izuku's throat. His pupils dilated into sharp, black needles. 

Of all the teams. Of all the matchups. It was happening right now. On day one. 

Bakugo turned his head slowly. The feral, predatory grin that stretched across his face made the hair on the back of Izuku's neck stand on end. Bakugo slammed his grenade-gauntleted fists together, producing a muffled, echoing boom. 

"Villain Team, go inside and set up!" All Might instructed. "In five minutes, the Hero Team will break in and the battle will begin!"

As Bakugo and Iida walked past them toward the building, Bakugo didn't even look at Izuku. He didn't need to. The killing intent radiating off him was palpable. 

Outside the building, looking at a blueprint provided by All Might, Izuku took a deep breath. He closed his eyes, engaging his breathing technique. Inhale sharp. Exhale heavy. Oxygenate.

He felt the hum of his suit's cooling pumps activate, sensing the slight rise in his core temperature. The cool freon pressing against his skin grounded him. 

"Deku?" Uraraka asked softly. "Are you okay? You're shaking."

Izuku opened his eyes. "I'm okay. Just... strategizing. Kacchan is going to come straight for me."

Uraraka frowned. "Bakugo? You two know each other, right?"

"We grew up together," Izuku said, tracing the blueprint with a clawed finger. "He has an explosive Quirk. The sweat on his palms is a nitroglycerin-like substance that he can detonate at will. And those gauntlets..." Izuku shuddered slightly. "They look like they're designed to store his sweat and release it in concentrated, massive blasts. If I take a direct hit from one of those, the match is over."

Izuku looked down at his own wrists. "Uraraka-san, my Quirk gives me extreme speed, but my bones are hollow and porous, like a bird's. I am incredibly fragile. A shockwave from Kacchan's explosions won't just bruise me; it will shatter my ribs. I cannot fight him head-on."

Uraraka gasped. "Then what do we do? Should we stick together?"

"No," Izuku said, his voice dropping into a focused, analytical tone. The nervous fanboy was gone; the apex predator was taking the wheel. "Kacchan is driven by his pride. He will ignore the objective—the bomb—to hunt me down. He thinks I'm looking down on him. So, we're going to use that."

Izuku looked Uraraka in the eye, his golden slits burning with determination. "I am going to be the bait. I will draw Kacchan away. You find the weapon and Iida."

"But Deku, you just said his explosions could break your bones!" Uraraka protested. 

"They can. If they hit me," Izuku said, a faint, predatory smirk touching his lips. He unclasped his mouth-guard, letting it hang around his neck. "Kacchan is artillery. He's loud, destructive, and relies on overwhelming force. But we're indoors. In a confined space, a predator has the advantage. I'm going to play a game of cat and mouse with him until he exhausts himself. I won't let him touch me."

Inside the five-story concrete building, on the top floor, Iida was entirely immersed in his role. He had cleared the room of all debris to prevent Uraraka from using her Zero Gravity Quirk on loose objects. 

"Behold, my villainous lair!" Iida declared, striking a dramatic pose next to the papier-mâché nuclear weapon. "Bakugo! We must strategize! Midoriya possesses terrifying acceleration, and Uraraka can remove our gravity! We should defend this room together!"

Bakugo was standing by the door, staring down the dark stairwell. "Shut up, Four-Eyes. You guard the stupid toy. I'm going hunting."

"Hunting? Bakugo, our objective is defense!" Iida chopped his hand through the air. "Going on the offensive is a tactical error!"

"That damn nerd," Bakugo growled, his palms sparking violently. "He lied to me for ten years. Pretending he was some weak, overheating stray cat. He thinks his little burst of speed makes him better than me. I'm going to blow his frail little legs off so he can't run away."

Bakugo stalked down the stairs, ignoring Iida's protests. The shadows of the hallway swallowed him. 

"NOW, LET THE INDOOR COMBAT TRAINING BEGIN!" All Might's voice blared over the intercom. 

Izuku and Uraraka entered through a first-floor window. 

The interior of the building was dimly lit, silent, and felt like a labyrinth. Izuku instantly dropped to a low crouch. The transformation aspect of his Quirk flared to life. His heart rate locked at 120 BPM. The fur on his arms bristled, sensing the micro-currents of air in the hallway. His ears swiveled independently, scanning for frequencies humans couldn't process. 

Smell, Izuku thought. Focus. 

He flared his nostrils. Through the scent of dust and concrete, he caught it. Sweet, burnt sugar. Ozone. Nitroglycerin. 

"He's coming," Izuku whispered, his tail twitching. "Uraraka, go. Take the east stairwell. I hear him above us on the central stairs. Go now."

Uraraka nodded silently, making herself weightless to run silently down the adjacent hallway. 

Izuku stepped into the center of the corridor. He didn't hide. He stood perfectly still, waiting. 

From around the corner, heavy boots stomped against the concrete. Bakugo appeared. The moment his crimson eyes locked onto Izuku, a terrifying grin split his face. 

"There you are, Deku!" Bakugo roared. 

He didn't hesitate. Bakugo threw his right hand back, unleashing a massive explosion that propelled him forward like a missile. He crossed the twenty feet between them in a fraction of a second, his left palm aiming directly for Izuku's face. 

First strike. Right hook swing, blast propulsion, Izuku's mind processed the information at hyper-speed. 

Izuku didn't step back. He stepped under. 

With a burst of acceleration that cracked the tile floor, Izuku dropped flat onto his back, sliding under Bakugo's flying form. As Bakugo passed over him, Izuku swung his heavy, muscular tail upward. 

Smack. 

The thick appendage struck Bakugo squarely in the back of the knee. It wasn't enough to break bone, but it completely destroyed Bakugo's center of gravity mid-flight. 

Bakugo crashed into the wall behind Izuku, his explosion detonating harmlessly against the ceiling, showering the hallway in plaster dust. 

Izuku flipped back to his feet, sliding ten yards down the hallway to maintain his distance. "Kacchan! You always lead with a right hook when you're angry!"

Bakugo coughed through the dust, his eyes burning with fury. He pushed himself off the wall. "You read my moves?! You damn nerd, I'll kill you!"

Bakugo unleashed a barrage of rapid-fire explosions, sending waves of fire and concussive force hurtling down the hallway. 

Izuku didn't fight back. He ran. 

He pushed his speed to fifty miles per hour, darting around the corner just as a fireball engulfed the space he had occupied a millisecond prior. The shockwave slammed into his back, pushing him forward. His hollow bones rattled violently, a sickening ache spreading through his ribs. 

Too close, Izuku thought, his suit's cooling pumps whirring to life, flooding his skin with icy relief. I can't take even a grazing hit.

Bakugo pursued, blasting himself around the corner. "Get back here, coward!"

But the hallway was empty. 

Bakugo stopped, panting slightly. He looked left, then right. Nothing. "Where did you go, you little rat?!"

Above Bakugo, in the thick shadows of the ceiling, Izuku hung suspended. His claws were driven deep into a massive, steel ventilation pipe. He was completely silent. His digitigrade legs were coiled against the ceiling, his tail wrapped securely around the pipe to prevent it from dangling. 

His golden, slitted eyes watched Bakugo in the dark. 

He's relying on sight, Izuku analyzed, watching Bakugo stalk down the hall. In an enclosed space, an explosive Quirk is a disadvantage if the user can't track their target. The sound of his own explosions is deafening him, and the flash is ruining his night vision.

Izuku waited until Bakugo passed directly beneath him. Then, he let go. 

He dropped silently, landing perfectly on his padded feet directly behind Bakugo. Before Bakugo could turn, Izuku lashed out with his claws, severely slicing the thick fabric of the grenade gauntlet on Bakugo’s left arm, rendering the storage tank useless, before instantly springing backward into the shadows of a connecting room. 

Bakugo felt the slice. He spun around, firing a massive blast into the empty air, roaring in frustration. "Stop hiding!" 

"I'm not hiding, Kacchan," Izuku's voice echoed from three different directions, bounding off the concrete walls. "I'm hunting."

In the monitor room, the rest of Class 1-A watched the screens in stunned silence. 

"He's completely dominating Bakugo," Kirishima said, his jaw slack. "But he hasn't even thrown a punch!"

"It's psychological warfare," Momo Yaoyorozu observed, her dark eyes analyzing the screens. "Midoriya knows his physical limitations. He cannot afford to exchange blows. So, he is utilizing his environment, his speed, and his stealth to disorient Bakugo. He is forcing Bakugo to expend massive amounts of energy and sweat on empty space."

"But look at Midoriya's thermal readout," Aizawa noted, standing in the back of the room. He pointed to a secondary screen displaying Izuku's vitals. 

Izuku's core temperature was steadily climbing. The suit's coolant reservoir, displayed as a green bar, was dropping. 

"His suit is buying him time, but the stress of rapid acceleration and deceleration is building heat," Aizawa explained. "If he doesn't wrap this up soon, his coolant will boil off, and he will stroke out."

Back in the building, the cat-and-mouse game continued. 

Izuku was a phantom. He ran across the walls, using his claws to corner at impossible angles. He would appear at the end of a hallway, taunt Bakugo with a flick of his tail, and vanish the moment Bakugo fired. The building shook with the constant detonations. 

Bakugo was breathing heavily. Sweat poured down his face. His arms ached from the recoil of his own Quirk. He had destroyed half the second floor, but he hadn't landed a single hit on Izuku. 

"Damn it... damn it!" Bakugo panted, his vision swimming with rage. "You think... you're so much better than me?! Looking down on me from the shadows?!"

Izuku crouched behind a collapsed pillar, wiping a bead of sweat from his brow. His suit was working overtime, the pumps whining loudly. His core temperature was at 39 degrees. The coolant was at 30%. 

I'm burning up, Izuku thought, his heart rate a frantic 180 BPM. I can't keep this up much longer. Uraraka, please hurry.

Through his earpiece, a burst of static crackled. "Deku! I found the weapon! It's on the fifth floor, in the center room. But Iida found me! He's super fast, I can't get close to the bomb!"

Izuku tapped his earpiece. "Hold on, Uraraka. I'm going to finish things down here and come help."

Bakugo’s ears twitched. He heard the faint crackle of the earpiece. 

Bakugo’s feral grin returned, but this time, it was devoid of blind rage. It was cold. Calculating. 

"Found you," Bakugo whispered. 

Izuku heard the shift in Bakugo’s posture. He peeked around the pillar. 

Bakugo wasn't looking at the pillar. He was looking at the structure of the hallway. He raised his intact right gauntlet. He reached for the pin. 

"Kacchan, no!" Izuku yelled, stepping out. "A blast that size indoors will bring the ceiling down!"

"They asked me to design these gauntlets to store my sweat," Bakugo said, his voice eerily calm. "If they're full... they produce a blast so big, it doesn't matter how fast you are. You can't outrun a shockwave in a closed box."

In the monitor room, All Might grabbed the microphone. "YOUNG BAKUGO, STOP! ARE YOU TRYING TO KILL HIM?!"

"He won't die if he dodges!" Bakugo screamed, ripping the pin out. 

The world went white. 

A torrent of blinding, superheated plasma erupted from the gauntlet. The sheer volume of the blast consumed the entire hallway. The concrete walls vaporized. The floor warped. 

Izuku didn't have time to think. He relied on pure, unfiltered instinct. 

He didn't run away from the blast; it was expanding too fast. He leaped up. He drove his claws into the ceiling, ripping through the plaster to grip the steel I-beams above. He pulled his body as flat against the ceiling as possible. 

The inferno roared beneath him, a river of fire that singed his fur and superheated the air in his lungs. The shockwave slammed into the building, shattering the windows and sending tremors all the way up to the fifth floor. 

When the fire dissipated, the hallway was gone. It was just a massive, smoking crater. 

Izuku fell from the ceiling, landing on his hands and knees. He coughed violently, hacking up black soot. 

Warning: Coolant Reservoir Depleted, his suit's automated voice chimed. Core Temperature Critical.

The green mesh of his suit was scorched black. The micro-pumps sputtered and died. The comforting cold was gone, instantly replaced by the terrifying, suffocating heat of his own boiling blood. His vision blurred, the edges of his sight creeping with darkness. 

"Deku?!" Uraraka’s voice panicked over the comms. "What was that explosion?! Are you okay?!"

Izuku couldn't answer. He was panting wildly, trying to expel the heat. 

Footsteps crunched over the rubble. 

Bakugo walked through the smoke. His right gauntlet was smoking heavily, his arm trembling from the massive recoil. But he was standing. And he was looking down at Izuku. 

"You see, Deku?" Bakugo sneered, though he was gasping for air. "You're just a bug. You can scurry around the walls all you want, but when I bring the boot down, you get squashed. Now... stay down."

Izuku slowly raised his head. His golden eyes locked onto Bakugo. 

I have no coolant, Izuku thought, his analytical mind fighting through the haze of heatstroke. I have maybe ten seconds of consciousness left before my brain begins to cook. My bones ache. My muscles are tearing.

He thought of Aizawa's words. What happens on minute two when your engine is overheated?

He thought of All Might. A hero always has to put their life on the line.

Izuku gripped the rubble beneath him. He didn't stand up. He remained in his low, digitigrade crouch. 

"Kacchan," Izuku rasped, his voice rough and feral. "You think I've been looking down on you. But I haven't. I've always looked up to you. Your Quirk, your confidence, your strength. You're amazing."

Bakugo flinched, his eyes widening slightly. 

"But I want to be a hero too," Izuku snarled, his lips pulling back over his sharp canines. "And if I have to go through you to do it... then I will!"

"Shut up!" Bakugo roared, raising his hands for another blast. 

"Uraraka!" Izuku screamed into the comms. "Grab the pillar!"

On the fifth floor, Iida was distracted by the massive tremor from Bakugo's blast. Uraraka didn't hesitate. She ran to the central concrete pillar of the room, touched it, and made it weightless. 

Down in the crater, Izuku engaged his Quirk at 100%. 

He ignored the warning sirens in his head. He ignored the agonizing heat. He pushed his engine into the red. 

The Ten-Second Blitz.

Izuku kicked off the ground. The force was so immense that the crater beneath him shattered into dust. He broke the sound barrier inside the building. The sonic boom shattered whatever glass was left on the second floor. 

He didn't run around Bakugo. He ran at him. 

Bakugo fired. A massive explosion erupted point-blank. 

Izuku didn't dodge laterally. He dropped into a slide, moving so fast the friction burned the fabric of his suit. The fireball scorched the air just inches above his head. He slid directly between Bakugo’s legs, springing up behind him. 

Bakugo spun, firing a backhand blast. 

Izuku twisted in mid-air, using his heavy tail as a rudder to alter his trajectory mid-flight. The explosion grazed his shoulder, the concussive force rattling his collarbone, but he pushed through the pain. 

Five seconds. 

Izuku landed on the wall, rebounded, and launched himself directly into Bakugo's guard. He was inside the blast radius. If Bakugo fired now, he would blow them both up. 

Bakugo hesitated for a fraction of a second. 

It was all Izuku needed. 

Izuku didn't punch. He used martial arts theory. He grabbed the thick fabric of Bakugo's combat vest with his clawed hands. He dropped his center of gravity instantly, pulling Bakugo forward and off-balance. 

Three seconds. 

With Bakugo's weight shifted forward, Izuku executed a flawless judo throw. But he didn't just use his arms and hips. He whipped his massive tail around in a brutal, sweeping arc, slamming it into Bakugo's ankles just as he pulled him over his shoulder. 

The combined force of the throw and the tail sweep launched Bakugo into the air with terrifying velocity. 

At that exact moment, Izuku aimed Bakugo’s trajectory upward, directly at the ceiling. 

"URARAKA, NOW!" Izuku roared. 

On the fifth floor, Uraraka swung the weightless concrete pillar like a baseball bat, smashing it into the floor directly above where Izuku and Bakugo were fighting. The floor weakened instantly. 

Bakugo’s body smashed right through the weakened ceiling, flying up into the third floor, then the fourth. 

One second. 

Izuku leaped after him, riding the ascending debris. They burst through the floor of the fifth-story room, right in front of a stunned Iida and Uraraka. 

As they reached the apex of their flight, Izuku grabbed Bakugo by the collar, spun in mid-air, and slammed the explosive boy down onto the concrete floor with a deafening crash. 

Izuku landed in a crouch directly on top of Bakugo, pinning his arms to the floor. 

"Uraraka!" Izuku yelled, his voice cracking. 

Uraraka dove past a horrified Iida and slammed her hands onto the papier-mâché weapon. 

"Secured!" she yelled. 

A heavy silence fell over the room, broken only by the sound of crumbling concrete and Izuku's ragged, desperate panting. 

"HERO TEAM... WINS!" All Might's voice announced over the intercom, trembling slightly. 

The moment the words were spoken, the predatory fire in Izuku's eyes extinguished. 

The adrenaline dumped from his system, leaving only the catastrophic thermodynamic fallout. His core temperature was over forty-two degrees. He was severely dehydrated, his lips cracked and bleeding. The muscles in his legs spasmed violently, micro-tears shredding the tissue. 

His eyes rolled back in his head. 

"Deku?!" Uraraka cried out, running toward him. 

Izuku collapsed forward, falling unconscious before he even hit the floor, his head resting limply on Bakugo's chest. 

Bakugo lay there, pinned beneath the unconscious, overheated body of the boy he had called useless his entire life. He stared blankly at the ceiling, the reality of his defeat washing over him in a cold, crushing wave. He hadn't just lost the objective. He had been completely outplayed, outmaneuvered, and physically overpowered by a glass cannon. 

When Izuku slowly opened his eyes, he was staring at the familiar white ceiling of the U.A. infirmary. 

The smell of antiseptic stung his sensitive nose. He felt an IV needle in his arm, pumping chilled saline and electrolytes into his dehydrated body. His entire body ached with a dull, throbbing pain, particularly his back and legs. 

"You're a reckless idiot, you know that?" 

Izuku turned his head. Sitting in a chair next to his bed was Recovery Girl. She looked immensely displeased. 

"You boiled your own fluids, boy," she scolded, hitting him on the shin with her cane. "Your suit's cooling system is the only reason you didn't suffer permanent brain damage. You pushed your engine a full fifteen seconds past your limit!"

"I... I had to," Izuku croaked, his throat incredibly dry. "I had to stop Kacchan."

"You have to learn to stop yourself," a deep voice rumbled from the doorway. 

All Might stepped into the room, his massive frame filling the doorway. He wasn't smiling. 

Recovery Girl sighed, hopping off her chair. "I've healed his muscle tears, but he's severely dehydrated. He needs rest. I'll leave you two alone, but don't keep him long, Toshinori."

She waddled out, closing the door behind her. 

All Might pulled up a chair and sat heavily. He looked at Izuku, his blue eyes filled with a complex mixture of pride and profound concern. 

"You won the match, Young Midoriya," All Might said softly. "Your tactical acumen was flawless. You played the villain like a fiddle. Young Yaoyorozu gave a breakdown of your strategy in the monitor room that left the whole class speechless."

Izuku offered a weak smile, his tail giving a small, tired thump against the mattress. "Really? They thought it was good?"

"It was brilliant," All Might agreed. "But Aizawa was right about you."

Izuku's smile faded. 

"Your willingness to destroy yourself to achieve victory is not a sustainable path to heroism," All Might said, leaning forward. "You utilized a ten-second blitz at the very end. It was magnificent. But if young Bakugo had possessed an ounce more stamina, or if there had been a second villain in that hallway, you would have been entirely at their mercy when you passed out."

Izuku looked down at his clawed hands, trembling slightly. "I know. The suit ran out of coolant. I was useless after that."

"You are not useless, Izuku," All Might said firmly, placing a massive hand over Izuku's. "You are learning. You proved today that a predator can defeat artillery. You proved that speed and stealth can overcome raw destructive power. But you must learn to retreat when your limit is reached. A living hero who retreats can fight another day. A dead hero saves no one."

Izuku swallowed the lump in his throat and nodded. "Yes, All Might. I'll do better."

"Good." All Might smiled, standing up. "Now, rest. You have earned it. Tomorrow, the class is going on a field trip to the Unforeseen Simulation Joint for rescue training. You'll need your energy."

After All Might left, Izuku lay in the quiet room. 

He had won. He had finally beaten Kacchan. But the victory felt hollow in his aching, exhausted body. He looked at his spotted fur, a permanent reminder of his feral nature. 

I am a sprinter, Izuku thought, closing his eyes as sleep pulled him under. I can break the sound barrier. I can outrun explosions. But if I don't learn how to cool down, the fire inside me is going to burn me to ash.

The human body is roughly sixty percent water. For a normal person, losing even five percent of that water leads to severe cognitive decline, muscle cramping, and exhaustion. For Izuku Midoriya, water was the only thing standing between him and a fiery, self-inflicted death. 

The morning after the combat simulation, Izuku sat at his desk in Class 1-A, methodically sipping from a massive, two-liter insulated thermos. His tail was wrapped securely around his waist, and his padded feet tapped a quiet rhythm on the floor. His muscles still hummed with a dull, residual ache from the micro-tears he had sustained during his ten-second blitz against Kacchan, but Recovery Girl’s quirk had done its job. The torn fibers were knitted back together, thicker and slightly more resilient than before. 

"Midoriya, you've been drinking water non-stop since homeroom started," Iida observed, marching over to Izuku's desk with rigid, choppy arm movements. "Proper hydration is essential for a hero, of course, but are you perhaps overdoing it?"

Izuku swallowed, lowering the thermos. "Ah, no, Iida-kun. It's part of my recovery protocol. Because my Quirk causes my core temperature to spike so aggressively, I sweat out massive amounts of fluid. I have to pre-hydrate and post-hydrate to keep my blood volume up, otherwise my heart has to work twice as hard to pump oxygen during a sprint."

"Fascinating!" Iida adjusted his glasses, his eyes gleaming with the intense camaraderie of a fellow speed-type. "A biological engine requires constant coolant! My own engines require me to drink a specific blend of citric acid and electrolytes to maintain optimal exhaust pressure. We are truly two sides of the same coin, Midoriya!"

"I wouldn't go that far," Izuku muttered, his feline ears drooping slightly in embarrassment as Uraraka wandered over, leaning on his desk.

"You were amazing yesterday, Deku," Uraraka said, her bright smile lighting up her round face. "I mean, it was super scary when you passed out, but the way you tricked Bakugo... you were like a ninja!"

Izuku rubbed the back of his neck, his spotted cheeks flushing. "I-I didn't have much of a choice. If I had fought him directly, I would have lost in one hit. I just... used the environment."

Izuku's ears suddenly twitched, swiveling independently toward the back of the classroom. 

Katsuki Bakugo sat slouched in his chair, his feet firmly planted on the floor for once. He was staring out the window, his expression dark, brooding, and uncharacteristically silent. He hadn't yelled once today. He hadn't called anyone an extra. The defeat had shattered his reality. He had fired his biggest blasts, leveled half a building, and the fragile, 'useless' Deku had still managed to throw him through a ceiling and win. 

He's recalibrating, Izuku thought, a shiver running down his spine. Kacchan never just accepts defeat. He's analyzing what happened. He's going to come back stronger, and much more careful.

The heavy classroom door slid open, and Shota Aizawa shuffled in, his yellow sleeping bag tucked under one arm. The class instantly went silent, scrambling to their seats. 

"Good work on yesterday's combat training," Aizawa drawled, stepping up to the podium. His tired eyes scanned the room, lingering for a fraction of a second on Bakugo, then on Izuku. "I saw the video and the results. Bakugo. You're talented, so don't sulk like a child about your loss. Learn from it."

Bakugo clicked his tongue, his eyes flashing with a sudden, angry spark. "...I know."

"And Midoriya," Aizawa continued. Izuku sat up perfectly straight, his tail stiffening. "Your tactical application was sound, and your environmental awareness saved you. But your stamina management is still a glaring liability. You destroyed your suit's coolant reserves in three minutes. If there had been a second villain, you would have died. Don't let a victory blind you to your own fatal flaws."

"Yes, Sensei," Izuku replied, bowing his head. 

"Now then," Aizawa said, pulling out a remote and pressing a button. The wall behind him slid open, revealing racks of metal briefcases containing their hero costumes. "Today's hero basic training will be a little different. We are doing a joint class, taught by myself, All Might, and one other hero. We will be doing Rescue Training."

A murmur of excitement rippled through the class. 

"Rescue training?" Kirishima grinned, pumping a fist. "Now that's what I'm talking about! Real hero work!"

"You can decide if you want to wear your costumes or not," Aizawa added, already turning toward the door. "Because this time, the training is taking place off-campus. We'll be taking a bus. Get dressed and meet outside in ten minutes."

The bus ride was surprisingly loud and chaotic. The vehicle was designed with a wide, open seating arrangement, forcing the students to face each other. Izuku sat near the middle, perfectly content to stay quiet and review his notebooks, but his unique appearance naturally drew attention. 

Tsuyu Asui, a girl with wide, unblinking eyes and a distinct frog-like mutation, leaned over from the seat across from him. 

"Midoriya," she said, her voice blunt and matter-of-fact. "I say whatever comes to my mind."

Izuku blinked, his ears perking forward. "Oh. Um, okay, Asui-san."

"Call me Tsu," she corrected smoothly. "Your Quirk. It's an animal mutation, like mine. But yours seems... volatile. You have the ears and tail of a cat, but when you move, it's like an explosion. It doesn't seem very natural."

Izuku looked down at his clawed hands. "It's a hybrid Quirk, Tsu. The mutation—the tail, the digitigrade legs, the hollow bones—is permanent. But the speed comes from a secondary, transformative metabolic state. When I activate it, my body basically floods itself with adrenaline and oxygen, pushing my fast-twitch muscles past their biological limits. My body is built to be a cheetah, but my engine runs like a jet plane."

"A jet plane in a fur coat," Denki Kaminari chuckled from the next seat over. "That's pretty badass, actually. But man, you and Bakugo really have some bad blood, huh? I thought he was gonna murder you yesterday."

Bakugo, sitting near the front of the bus, whipped his head around, his eyes burning red. "What did you say, you damn extra?! I'll kill you right now!"

"See?!" Kaminari yelped, leaning away. "He's like a boiling pot of rage!"

"It's because Bakugo has a massive ego," Tsuyu observed bluntly, putting a finger to her chin. "He was so sure he was the strongest, but Midoriya beat him without even throwing a real punch."

"I'LL PUNCH YOU, YOU DAMN FROG!" Bakugo roared, standing up in his seat. 

"Settle down," Aizawa's exhausted voice crackled over the intercom from the front. "We're here."

The bus pulled to a halt, and the doors hissed open. The students filed out, their bickering instantly silenced by the sheer scale of the facility before them. 

It was a colossal, dome-shaped building made of steel and reinforced glass, looking like a high-tech stadium crossed with a biosphere. Standing in front of the massive entrance doors was a figure in a puffy, astronaut-like suit. 

"Welcome, everyone!" the Space Hero, Thirteen, greeted them cheerfully. "I have been waiting for you!"

Uraraka immediately began vibrating with excitement. "Oh my gosh! It's the Rescue Hero, Thirteen! They're my favorite!"

"Inside this facility, I have built various simulated environments to mimic every kind of disaster," Thirteen explained, gesturing broadly to the doors. "A shipwreck, a landslide, a fire, a windstorm... I call it the Unforeseen Simulation Joint! Or, the USJ for short!"

As they walked inside, the students gasped. The interior was massive, divided into distinct, terrifying zones. To the left, a massive city block was engulfed in artificial flames. To the right, a massive wave pool churned with violent, simulated storms. In the distance, a rocky mountain range and a dense, humid jungle zone completed the biosphere. 

Izuku’s feline senses were instantly overwhelmed. The air smelled of chlorine, smoke, damp earth, and ozone. His ears twitched, picking up the hum of massive generators beneath the floorboards that powered the entire facility. 

Thirteen stepped up to a small podium. "Before we begin, let me say one thing... or two... or three... or four..."

The hero raised a puffy, gloved hand. "As you all know, my Quirk is Black Hole. It can suck up and tear apart any matter. However... it is a power that can easily kill people."

The class went dead silent. The excitement evaporated, replaced by a sobering reality. 

"Some of you have Quirks that are similarly lethal," Thirteen continued, their voice taking on a grave, serious tone. 

Izuku subconsciously curled his hands into fists. He felt the sharp points of his keratin claws pressing into the padded palms of his gloves. Lethal, he thought. If I don't pull my punches... if I run at sixty miles per hour and drag these claws across someone's throat... I wouldn't just defeat them. I would decapitate them. He shuddered. His Quirk wasn't just a rescue tool. It was the biological weapon of an apex predator. 

"In this superhuman society, Quirks are heavily restricted and certified," Thirteen said. "But please do not forget that many of your powers could easily destroy a human body. Yesterday, you learned combat. Today, you will learn how to use your Quirks to save lives."

The class erupted into applause. Izuku felt a surge of inspiration. This was it. This was where he would learn to be the hero All Might saw in him. 

But as Thirteen bowed, Izuku's ears suddenly snapped completely flat against his skull. 

A sound pierced through the hum of the facility. It wasn't a mechanical sound. It was the sound of air tearing, a wet, violent ripping noise, followed instantly by a drop in atmospheric pressure. A scent hit Izuku's highly developed olfactory receptors—a smell so foul, so deeply unnatural, that his stomach lurched. It smelled like dried blood, rust, and ozone. 

"Sensei," Izuku whispered, his tail bristling until it was twice its normal size. "Something... something is wrong."

Aizawa, who had been standing off to the side, frowned. He followed Izuku's gaze toward the central plaza, nestled between the various disaster zones. 

The lights in the USJ flickered, the massive overhead bulbs buzzing violently before violently shattering, raining glass down on the concrete. The facility plunged into a dim, eerie twilight. 

In the center of the plaza, a small speck of black mist appeared. It swirled, expanding rapidly, tearing open the fabric of space itself. The mist was a deep, bruised purple, shifting and rolling with malicious intent. 

From the center of the void, a pale, disembodied hand reached out, grabbing the edge of the portal. 

Aizawa’s eyes widened. He immediately stepped in front of the students, his hands dropping to the capture weapon around his neck. "Gather together and don't move! Thirteen, protect the students!"

"What is that?" Kirishima asked, squinting down at the plaza. "Is this like the entrance exam? Has the training already started?"

"Stay back!" Aizawa roared, his voice laced with a genuine, raw panic that Izuku had never heard before. Aizawa yanked his yellow goggles down over his eyes. "Those are real villains."

The words hung in the air, cold and suffocating. 

The portal expanded into a massive gate. Out of the purple mist stepped a horde of nightmares. There were men with reptilian scales, women with extra limbs, towering brutes with jagged horns, and people armed with heavy, rusted weaponry. Dozens of them. Hundreds of them. 

Leading the pack was a lanky, emaciated man covered in pale, disembodied hands clutching his face and arms. Beside him stood a massive, hulking creature—a biological abomination with exposed black muscle, a bird-like beak, and an exposed, pulsing brain in its skull. 

Izuku couldn't breathe. His heart rate skyrocketed to 160 BPM, not from running, but from sheer, primal terror. The predator inside him was screaming, recognizing that whatever was down there in the plaza was completely outside the natural order. 

"Villains? No way," Kaminari stammered, backing away. "How could they get into a U.A. facility?"

"Thirteen, begin evacuation," Aizawa ordered, uncoiling his capture weapon. "Try calling the school. These villains had something to do with the sensors failing. It's a targeted ambush."

"Sensei, you can't fight them all on your own!" Izuku yelled, taking a step forward. "Your fighting style is capturing after erasing an enemy's Quirk! A frontal battle against a mob is your weakness!"

Aizawa looked back at Izuku. His expression was grim, but resolute. "You can't be a pro if you only have one trick, Midoriya. Thirteen, I leave them to you."

Without hesitation, Aizawa leaped off the massive staircase, plunging directly into the sea of villains below. 

"We have to go!" Thirteen shouted, ushering the students toward the heavy entrance doors. 

Izuku hesitated. His eyes were locked on Aizawa, watching the underground hero move with incredible fluidity, erasing Quirks and binding thugs in rapid succession. But there were so many. 

"Midoriya, come on!" Iida grabbed Izuku's shoulder, pulling him toward the exit. 

They didn't make it. 

Before they could reach the doors, the air in front of them warped. The purple mist that had formed the portal in the plaza suddenly manifested right in their path, rising from the floor in a towering wave of shadow. 

The mist coalesced, forming a pair of glowing, sinister yellow eyes. 

"I won't let you do that," a sophisticated, echoing voice emanated from the darkness. "Nice to meet you. We are the League of Villains. It may be presumptuous of us, but we have invited ourselves into the home of the heroes, U.A. High School, in order to have All Might, the Symbol of Peace, take his last breath."

Izuku's blood ran cold. They're here to kill All Might. 

"I believe All Might should have been here," the mist, Kurogiri, continued. "Has there been some kind of change? Well, that is neither here nor there. This is the part I am to play."

The mist suddenly expanded, billowing outward in a massive, suffocating dome. 

"Get back!" Thirteen yelled, opening the caps on their fingers to activate Black Hole. 

But Bakugo and Kirishima were faster. "Did you consider that you'd get beaten by us before you could do it?!" Bakugo roared, launching himself forward with Kirishima right beside him. They slammed an explosion and a hardened punch directly into the mist's center. 

A massive blast rocked the entrance, kicking up a cloud of smoke. 

"No, get away from him!" Izuku screamed, his hyper-perceptive eyes seeing through the smoke. Bakugo's blast hadn't hit a physical body. It had just dispersed the fog. 

"That was dangerous," Kurogiri's voice echoed from everywhere at once. "That's right. Even if you are students, you are excellent golden eggs."

The mist surged forward, faster than any of them could react. It engulfed the entire class, swallowing the light. 

Izuku felt the ground vanish beneath his feet. The sensation of falling was absolute. He lashed his tail out blindly, trying to find a surface, trying to find balance, but there was nothing. Only the cold, dark void. 

Warp Quirk, Izuku's mind frantically calculated. He's scattering us. Where is he sending me?

Suddenly, the void broke. 

Izuku didn't land on concrete. He crashed through a canopy of thick, wet leaves. 

His feral instincts overrode his panic instantly. Mid-fall, Izuku twisted his body violently. His tail whipped around, altering his trajectory. He reached out with his clawed hands and dug deep into the bark of a massive, humid tree trunk. 

He slid down the bark for a few feet, his claws carving deep grooves into the wood, before he arrested his momentum completely. He hung there, suspended upside down on the side of the tree, panting heavily. 

He opened his eyes. The light was dim, filtered through layers of dense, suffocating foliage. Heavy, artificial rain was pouring down from the ceiling of the dome far above, soaking the leaves and turning the ground below into a thick, muddy swamp. The air was incredibly humid, smelling of moss, decaying wood, and ozone. 

He was in the Squall Zone. The Jungle. 

Splash. 

Izuku's ears swiveled. Below him, two figures had crashed into a shallow pool of muddy water. 

"Ribbit," Tsuyu groaned, sitting up and rubbing her head. "That was a rough landing."

Next to her, Fumikage Tokoyami pulled himself out of the mud, his dark, avian features set in a grim scowl. Dark Shadow, his sentient Quirk, manifested over his shoulder, looking around nervously. "A teleportation ambush. We are separated from the vanguard."

Izuku dropped from the tree, landing silently on his padded feet next to them. "Tsu, Tokoyami, are you both okay?"

"We are uninjured," Tokoyami said, brushing mud off his cloak. He looked up at Izuku, noting the way Izuku’s digitigrade stance kept him perfectly balanced on the uneven, slippery mud. "You adapt to the terrain well, Midoriya."

Izuku didn't answer. His ears were swiveling wildly, and his vertical pupils were dilated as wide as saucers, trying to pull in every ounce of light in the dim jungle. His tail gave a low, agitated swish, splashing the mud. 

"They're here," Izuku whispered, his voice dropping an octave. 

"Who?" Tsuyu asked. 

The bushes around them rustled. Shadows detached themselves from the massive ferns and ancient trees. 

A dozen men emerged from the foliage. They were armed with rusted machetes, electro-shock batons, and crude firearms. They wore haphazard armor, their faces twisted into ugly, confident sneers. They had entirely surrounded the three students. 

"Look what we have here," a large man with a reptilian snout laughed, slapping a machete against his palm. "Three little birds fell right into the snake's nest. The warp guy said we'd get to kill some U.A. kids, but I didn't think it'd be this easy."

Tokoyami took a defensive stance, Dark Shadow growling deeply. "Fools. You trespass on sacred ground and threaten the innocent. You will meet the dark."

"Big words for a kid in a cape," another thug sneered, raising a crossbow. "Let's gut 'em and get back to the plaza to watch All Might die."

Tsuyu crouched low, preparing to leap. "Midoriya, there are twelve of them. If we fight them all at once, we'll be overwhelmed. Should we run?"

Izuku didn't move. He stood perfectly still, his eyes darting across the environment. 

The heavy, artificial rain pelted against his new hero suit. The cool water washed over the micro-mesh, rapidly chilling his skin. The ground beneath his feet was soft, damp earth, perfect for his claws to grip. The canopy above was dense, interwoven with thick vines and branches, creating a labyrinth of shadows. 

In the city simulation against Bakugo, Izuku had been fighting his environment. Concrete offered poor traction. The open hallways offered no cover. The stagnant air trapped his heat. 

But here? 

I am a cheetah, Izuku thought. But right now... I am a jaguar.

This was not a combat arena. This was a hunting ground. And Izuku possessed the biological tools of a hyper-predator. The rain was his coolant. The shadows were his camouflage. 

"No," Izuku said softly. 

He reached up and pulled his dark metallic mouth-guard over his lower face, concealing his jaw and leaving only his glowing, golden, slitted eyes visible in the dim light. 

"Tsu. Tokoyami," Izuku's voice was muffled through the respirator, sounding deep and metallic. "Stay here. Protect each other. Do not advance."

Tokoyami frowned. "Midoriya? What are you—"

"I am going into the canopy," Izuku interrupted, dropping down onto all fours. The mud squelched beneath his clawed gloves. "When I start... do not look up."

Before either of his classmates could question him, the thugs charged. 

"Kill the kids!" the reptilian man roared, swinging his machete. 

Izuku's muscles fired. 

He didn't sprint forward. He sprang upward. With a single, explosive contraction of his digitigrade legs, he launched himself twenty feet straight into the air. He soared over the heads of the charging villains, completely clearing their line of sight, and vanished into the thick, dark leaves of the canopy. 

The thugs stopped, confused. "Where did he go? Did he just abandon them?"

"Forget the coward!" one of them yelled. "Get the bird and the frog!"

High above, hidden perfectly in the darkness of the interlacing branches, Izuku moved. He was completely silent. The shock-absorbing gel in his modified boots dampened any vibration against the wood. The heavy sound of the rain masked the rustle of the leaves. 

His vision shifted, mapping the thermal signatures of the twelve men below. He could hear their heartbeats. He could smell their sweat, their cheap cologne, and their rising adrenaline. 

First target, Izuku's analytical mind processed coldly. The man with the crossbow. Ranged weapons are the highest threat.

The crossbow wielder was standing near the back of the group, aiming at Tokoyami. 

Izuku hung upside down from a thick branch directly above the man, his tail wrapped around the wood for stability. He waited for a heavy clap of artificial thunder from the zone's weather system. 

Crash.

Izuku dropped. 

He fell ten feet, landing perfectly on the man's shoulders. The thug didn't even have time to scream. Izuku wrapped his muscular legs around the man's torso, hooked his claws under the man's tactical vest, and violently wrenched his own body weight backward, using a Capoeira-style grappling maneuver. 

The man was hoisted violently off his feet and yanked upward into the darkness of the trees. 

"Hey, where did Gary go?" one of the thugs asked, turning around. 

Gary was gone. His crossbow clattered into the mud. 

A moment later, something heavy fell from the canopy. It was Gary. He hit the mud face-first, completely unconscious, tightly bound in thick, green vines Izuku had stripped from the trees. 

Panic rippled through the group. 

"What the hell?!" the reptilian man shouted, looking up into the rain. "Show yourself, you brat!"

There was no answer. Just the sound of the rain. 

Below, Tokoyami and Tsuyu watched in stunned silence. 

"Tokoyami," Tsuyu whispered, her wide eyes glued to the canopy. "Midoriya... he didn't even make a sound."

Tokoyami’s eyes narrowed. "He has embraced the dark. He is using fear as a weapon."

Another thug, armed with an electro-shock baton, backed away from the group, his eyes darting around wildly. "Screw this! The warp guy said this would be easy! There's a monster in the trees!"

The man backed into a massive fern bush. 

A yellow-and-black blur shot out from the foliage. Izuku moved at forty miles per hour, staying low to the ground. He swept his tail violently, catching the back of the man's knees. The thug went airborne. Before the man even hit the ground, Izuku's clawed hand slashed forward, severing the wiring of the electro-baton, rendering it useless. Izuku delivered a precise, open-palm strike to the man's solar plexus, knocking the wind out of him, and then vanished back into the bushes before the man's body even settled into the mud. 

"He's in the bushes!" someone screamed. "Burn them down! Burn the bushes!"

A villain with a fire-breathing Quirk stepped forward, inhaling deeply. 

Fire, Izuku thought, his heart rate ticking up. He'll dry out the zone and burn my cover. I have to stop his respiratory intake.

Izuku bounded up the trunk of a tree, ricocheting off the bark like a pinball. He launched himself through the air, completely horizontal, crossing the thirty-foot gap between the trees in a fraction of a second. 

As he sailed over the fire-breathing villain, Izuku uncoiled his heavy tail, whipping it down with extreme precision. The dense cartilage struck the back of the villain's head, snapping his jaw shut just as he was about to exhale. The villain choked on his own smoke, collapsing to his knees, coughing violently, before Izuku's foot connected with the side of his helmet, knocking him out cold. 

Izuku landed softly in a crouch on the other side of the clearing. 

For the first time, the villains saw him clearly. 

He didn't look like a high school student. His green suit was slick with rain and mud. His vertical, golden pupils glowed with an eerie, predatory light from beneath his metallic mouth-guard. The fur on his arms was bristled, and his long, spotted tail lashed back and forth, splashing the mud. He was breathing steadily, his chest rising and falling, his engine running at a perfect, sustainable idle. 

"He... he's just a kid!" one of the thugs stammered, his knife shaking. "There's only one of him! Rush him!"

Four villains charged at him simultaneously. 

Izuku didn't run away. He didn't need to. The rain was keeping his core temperature perfectly regulated. His suit wasn't even working hard. Here, in the jungle, he could use his speed for as long as he wanted. 

He dropped to all fours. 

BOOM.

The mud exploded behind him as he accelerated to sixty miles per hour in two strides. To the villains, it was as if Izuku had simply ceased to exist. 

He wove through the four men in a terrifying display of agility. He didn't punch; he dismantled. 

He slashed the belt of the first man, dropping his pants to his ankles and tripping him. He rebounded off a tree, using his tail to clothesline the second man, flipping him backward. He vaulted over the third man, driving his padded heel into the pressure point on the man's neck, shutting down his nervous system instantly. 

For the final man, Izuku stopped directly in front of him. The sudden deceleration kicked up a wave of mud that splashed over the villain. The man froze, his machete raised, staring directly into Izuku's glowing, slit eyes. 

Izuku let out a low, visceral growl from deep within his chest—a sound he didn't even know he could make. It was the terrifying, guttural rumble of a big cat warning its prey. 

The villain dropped the machete, put his hands in the air, and fainted from sheer terror. 

Within ninety seconds, eleven of the twelve villains were incapacitated, bound in vines, or unconscious. 

Only the reptilian leader remained. 

The large man was panting, looking around at his defeated crew. His bravado was entirely gone. He looked at Tokoyami and Tsuyu, who hadn't moved an inch, and then slowly looked up into the trees. 

He couldn't see Izuku. 

"W-Where are you?!" the leader screamed, swinging his machete blindly at the shadows. "Come out and fight me like a man!"

Above him, Izuku hung from a branch, perfectly still. He analyzed the leader. Reptilian mutation. Thick scales. Blunt force won't work easily. I need to leverage his own weight against him.

Izuku let go of the branch. 

He fell, aiming perfectly. He landed feet-first on the broad, scaled shoulders of the villain. The impact forced the man down to one knee. Before the villain could reach up, Izuku dropped a dense net of woven vines over the man's head, blinding him. 

Izuku backflipped off the man's shoulders, grabbing the trailing end of the vines. He hit the mud, engaged his sprint, and ran in a rapid circle around the villain, wrapping the heavy vines tightly around the man's arms and torso, binding him like a mummy. 

With a final, sharp tug, Izuku pulled the man off balance, sending him crashing face-first into the mud. 

Silence descended on the Jungle Zone, save for the steady patter of the artificial rain. 

Izuku stood up, exhaling a long, visible breath of steam. He reached up and unclasped his mouth-guard, letting it hang around his neck. The feral intensity drained from his eyes, his pupils returning to a softer, more rounded shape. His tail drooped, relaxing its tense posture. 

He looked over at Tsuyu and Tokoyami. They were staring at him with a mixture of profound awe and deep unease. 

"Is everyone okay?" Izuku asked, his voice returning to its normal, somewhat timid pitch. He rubbed the back of his neck, his ears flattening apologetically. "Sorry if I scared you guys. I just... my Quirk works really well in this kind of environment."

"You took down twelve armed men in under two minutes without sustaining a single injury or allowing them to launch a coordinated attack," Tokoyami said, his voice flat. Dark Shadow gave a low, appreciative whistle. "You are an apex predator, Midoriya. A creature born for the hunt. If you had villainous intent, we would all be dead."

"Ribbit," Tsuyu agreed, wading over to him. "You didn't even look like yourself, Midoriya. You looked like a wild animal. But... it was very heroic. Thank you."

Izuku smiled, a wave of relief washing over him. The predator inside him was a terrifying tool, but as long as he controlled it, he could use it to protect people. 

"We need to secure them properly," Izuku said, gesturing to the unconscious thugs. "Then we need to figure out a way out of here. If there are villains in the other zones, our classmates might be in trouble."

As they began tying the villains to the roots of a massive tree, Izuku’s ears twitched. 

He froze. 

The artificial rain was loud, but his feline auditory cortex was designed to filter out white noise and isolate specific frequencies. Frequencies like the snap of a twig, the rustle of leaves... or the sound of bone breaking. 

His ears swiveled, pointing directly toward the edge of the Jungle Zone, where the dense trees gave way to the central plaza. 

Crack. 

It was a wet, sickening sound. Like a thick branch being snapped in half, accompanied by a muffled, agonizing groan. 

"Midoriya?" Tsuyu asked, noticing his sudden rigidity. "What's wrong?"

Izuku’s heart rate instantly spiked back up. The hair on the back of his neck stood straight up. The feeling of absolute superiority he had enjoyed in the jungle vanished in an instant, replaced by a deep, biological terror. 

"Someone... someone is getting hurt," Izuku whispered, his eyes wide. "Really badly."

He didn't wait for them. He dropped to all fours and sprinted toward the edge of the zone, keeping low to the ground. Tokoyami and Tsuyu followed quickly behind him. 

They reached the treeline and crouched behind a thick wall of ferns that overlooked the central plaza. 

The plaza was a warzone. Unconscious villains littered the concrete, testament to Eraserhead's incredible skill. 

But Aizawa wasn't winning anymore. 

Izuku parted the fern leaves, his golden eyes shrinking into tiny pinpricks of pure horror. 

Aizawa was pinned to the ground. Above him was the massive, exposed-brain abomination Izuku had seen earlier. The creature—the Nomu—had Aizawa's arm gripped in its massive, black hand. 

With a sickening CRUNCH, the Nomu twisted Aizawa's arm backward, snapping the bone cleanly in half. 

Aizawa screamed, a raw, agonizing sound that tore through Izuku's highly sensitive ears like a physical blade. 

Standing a few feet away, the lanky villain covered in hands—Shigaraki—scratched at his neck, laughing dryly. "You're so cool, Eraserhead. So cool. But you're just a man. You're fighting a bio-engineered anti-Symbol of Peace. Nomu, break his other arm."

The Nomu raised a massive fist, slamming it down on Aizawa's other arm. Another horrific crunch echoed through the plaza. 

Izuku couldn't breathe. 

His body was vibrating violently. Every instinct in his cheetah DNA—every biological imperative hammered into his genetic code over millions of years of evolution—was screaming at him. 

Apex. 

The thing holding Aizawa was not a human. It was a hyper-predator. It was the absolute top of the food chain. Its muscle density, its lack of hesitation, the sheer, crushing pressure of its presence... it triggered a primal fear response in Izuku’s brain that was so powerful it physically paralyzed him. 

Flee, the beast inside Izuku's mind roared. Run! Hide! Survive! If you go out there, you will die! It will crush your hollow bones into dust! Run!

"Sensei..." Tsuyu whispered, her hands covering her mouth, tears welling in her large eyes. 

"This is bad," Tokoyami rasped, Dark Shadow retreating entirely into his cloak, whimpering in fear. "We cannot fight that thing. It is death incarnate. We must retreat and find All Might."

Izuku stared at Aizawa. The teacher’s face was bloodied, his goggles shattered. But even as the Nomu crushed his arms, Aizawa’s eyes glowed red, glaring up at Shigaraki, erasing his Quirk to prevent the villain from decaying him completely. 

He's still fighting, Izuku realized, tears burning in his eyes. His bones are broken, he's completely outmatched, but he's still fighting to protect us.

Izuku looked down at his clawed hands. He thought of his conversation with All Might in the infirmary. 

A living hero who retreats can fight another day. A dead hero saves no one.

Logic dictated he run. Biology demanded he run. 

But as Izuku watched the Nomu raise its fist to crush Aizawa's skull, logic and biology burned away in the furnace of his heroic spirit. 

He wasn't just a cheetah. He was a hero. 

"Tokoyami. Tsu," Izuku whispered, his voice trembling but laced with an absolute, terrifying resolve. He didn't pull his mouth-guard up. He wanted them to see his face. "Stay here."

"Midoriya, no!" Tokoyami hissed, grabbing Izuku's shoulder. "That is suicide! Your bones cannot take a hit from that monster!"

"I know," Izuku said, gently prying Tokoyami's hand off his shoulder. "But if I don't move right now... Aizawa-sensei is going to die."

Izuku turned his gaze back to the plaza. He engaged his breathing technique, taking a massive, hyper-oxygenated breath. He felt the liquid coolant in his suit begin to cycle, preparing for the immense thermal load. 

His golden eyes locked onto the Nomu. The fear was still there, a suffocating weight in his chest, but he forced it down, burying it beneath a mountain of sheer, unadulterated willpower. 

I am a glass cannon, Izuku thought, his digitigrade legs coiling like springs beneath him. So I just have to make sure... I don't get hit.

With a burst of speed that shredded the ferns around him, Izuku Midoriya launched himself out of the jungle and into the nightmare of the central plaza, sprinting straight toward the Alpha predator.