What If Deku Became a Genius Mechanical Engineer Creating Iron Man Style Suits

 

 

 

The wind howling across the rooftop of the nondescript apartment building sounded like a dying breath.

 

Izuku Midoriya stood frozen, his oversized red sneakers glued to the cracked concrete. The afternoon sun was beginning its slow descent, casting long, warped shadows across the rooftop, painting the world in shades of bruised purple and bleeding orange. But Izuku barely registered the sunset. He barely registered the chill in the air, or the distant, muffled sounds of the bustling city of Musutafu below.

 

His entire universe had just collapsed inward, compressed into a singular, suffocating singularity by a handful of words.

 

"Can a Quirkless kid like me become a hero? Can someone without power ever stand on the same stage as you?"

 

The question had poured out of him like a confession, desperate and raw. It was the question he had asked the universe every single night since he was four years old, staring up at his ceiling, tears streaming down his face as the doctor’s grim diagnosis echoed in his ears: Give it up, kid.

 

He had expected—needed—the towering, golden figure of All Might to turn around, flash that trademark, indomitable smile, and tell him the one thing no one else ever had. Yes. You can.

 

Instead, the steam had cleared. The illusion had shattered.

 

Standing before Izuku was not the Symbol of Peace. It was a skeletal, sunken-eyed man with sharp, angular features and a shirt that hung off his emaciated frame like a flag on a broken pole. Toshinori Yagi coughed, a wet, rattling sound, and wiped a ribbon of blood from his chin.

 

The explanation had been horrifying. A missing stomach. A shattered respiratory system. A hero operating on a ticking clock, barely holding society together through sheer, stubborn willpower and a dwindling reservoir of strength. Izuku had listened, paralyzed by the sheer magnitude of the secret entrusted to him.

 

But it was the answer to his question that dealt the fatal blow.

 

"Pro heroes are always risking their lives," All Might said, his voice stripped of its usual booming resonance, replaced by a quiet, devastating pragmatism. His hollow blue eyes looked at Izuku with genuine pity—a pity that felt like a physical blow to the sternum. "Some villains simply can't be beaten without powers. So, no. I honestly don't think you can become a hero without a Quirk."

 

The words hung in the air, heavy as lead.

 

"If you want to help people," the skeletal man continued, adjusting his baggy trousers, "be a police officer. They get a lot of crap because the heroes capture most of the villains, but it's a fine profession. It's not bad to have dreams, young man. Just... make sure they're realistic."

 

With that, the Number One Hero turned and limped toward the rooftop access door, opening it with a rusty screech of hinges. The door clicked shut.

 

Izuku was alone.

 

He didn't cry. The strange thing about having your soul entirely crushed was that it left very little room for tears. The reservoir was simply empty. Izuku felt a strange, detached numbness wash over him, starting from his fingertips and spreading upward, freezing his lungs, his heart, his throat.

 

Make sure they're realistic.

 

Izuku looked down at his trembling hands. They were small, unscarred, unremarkable. The hands of a normal, perfectly average, utterly useless boy. A boy with an extra joint in his pinky toe. A boy who would never conjure explosions from his sweat, who would never alter gravity, who would never possess the strength to smash through concrete or the speed to outrun a bullet.

 

For ten years, he had survived Katsuki Bakugo’s explosive bullying, the mocking laughter of his teachers, the pitying looks of his mother, all by clinging to a singular, irrational thread of hope. Maybe they're wrong. Maybe I'm a late bloomer. Maybe pure effort is enough.

 

All Might had just taken a pair of scissors and snipped the thread.

 

Izuku walked to the edge of the roof, looking down at the streets below. The cars looked like tiny metal beetles scurrying along the asphalt veins of the city. For a terrifying, fleeting second, a dark intrusive thought whispered in the back of his mind. Take a swan dive off the roof and hope for a Quirk in your next life. Bakugo’s cruel words from earlier that afternoon echoed in the chamber of his empty chest.

 

Izuku squeezed his eyes shut, his hands gripping the chain-link fence until his knuckles turned white. He inhaled a shaky, jagged breath.

 

"No," he whispered, the sound immediately snatched away by the wind.

 

He wasn't going to jump. He wasn't going to give Katsuki the satisfaction. But as he turned away from the edge and walked toward the stairwell, his shoulders slumped, bearing the invisible weight of a dead dream.

 

The walk down the stairs felt like wading through molasses. Every step was a mechanical, mindless action. Left foot. Right foot. Turn the landing. Left foot. Right foot.

 

By the time Izuku emerged onto the street level, he felt like a ghost haunting his own life. The city around him felt disconnected. The vibrant holographic billboards advertising Pro Heroes, the sirens wailing in the distance, the chatter of pedestrians—it all blurred into a static hiss.

 

He didn't know where his feet were taking him. He should be going home. His mother, Inko, was probably worrying, glancing at the clock on the kitchen wall, wondering why he was late. But Izuku couldn't face her right now. He couldn't look into her kind, tragic eyes and tell her that she had been right all along. That he was giving up.

 

A sudden, deafening BOOM rattled the fillings in Izuku’s teeth.

 

The ground shuddered beneath his red sneakers. A plume of acrid black smoke spiraled into the twilight sky just a few blocks away. Instinct, honed by years of chasing villain fights and hero debuts, flared in Izuku’s brain. His feet twitched, ready to sprint toward the danger, ready to uncap his notebook and analyze the situation.

 

Then, the memory of All Might’s hollow eyes flashed in his mind.

 

Make sure they're realistic.

 

Izuku forced his feet to stop. He looked down at his yellow backpack, which felt suddenly ten times heavier. What's the point? he thought bitterly. I'm just getting in the way. I'm just a spectator. A fanboy with a notebook.

 

Yet, the explosions continued. BAM. BAM. BAM. The staccato rhythm was familiar. It wasn't the chaotic, random destruction of a typical villain. It was rhythmic. Pacing. Like someone panicking, lashing out violently to keep something at bay.

 

Despite himself, Izuku found his legs moving. Not at a sprint, but a dull, reluctant trudge. He followed the smoke, blending into the crowd of onlookers that had gathered at Tatooin Shopping District.

 

The heat hit him first. The air smelled of burning asphalt, melting plastic, and... sweet caramel?

 

Izuku pushed through the throng of whispering, pointing citizens until he reached the front of the police barricade. His emerald eyes widened in sheer horror.

 

It was the Sludge Villain. The exact same suffocating mass of toxic, liquid muck that had nearly drowned Izuku under the overpass just an hour ago. The villain had escaped All Might’s containment bottles when Izuku had foolishly grabbed onto the hero's leg. This is my fault, Izuku realized, a cold spike of dread piercing his stomach. I dropped the bottles. I caused this.

 

But the horror didn't stop there. The villain wasn't just rampaging; he had a hostage.

 

Trapped within the swirling vortex of foul-smelling sludge was a teenage boy. The boy was violently thrashing, his hands thrust outward, unleashing massive, desperate explosions that shattered the shop windows and set the surrounding alleyway ablaze.

 

Spiky ash-blonde hair. Crimson eyes wide with unadulterated terror and furious defiance.

 

Kacchan.

 

Izuku’s breath hitched.

 

The Pro Heroes on the scene were useless. Death Arms, a hero with superhuman physical strength, was coughing and backing away, unable to find a solid target to punch in the villain's liquid body. Kamui Woods was practically paralyzed, his wooden biology a massive liability in the roaring fires Bakugo was creating. Backdraft, the water-hose hero, was desperately trying to keep the flames from spreading to the civilian crowd, utterly occupied. Mount Lady, the giantess who had debuted that very morning, was stuck at the entrance of the alley, whining that she needed at least a two-lane road to use her gigantification Quirk.

 

"We can't do anything!" Death Arms yelled over the roar of the flames, shielding his face from an errant explosion. "None of us have the right Quirks for this! We just have to wait for someone with a suitable power to show up!"

 

"He's running out of air!" a police officer screamed back. "The kid won't last another minute!"

 

He's going to die, Izuku realized. Kacchan is going to die.

 

In a normal world—in the world Izuku had inhabited just an hour ago—his legs would have moved before his brain could process the danger. He would have sprinted past the barricade, armed with nothing but a school uniform and a desperate need to save his childhood friend, throwing his pathetic backpack in a futile, heroic gesture.

 

But the roof had broken him.

 

Izuku’s legs felt like concrete pillars. He stared at Katsuki’s suffocating face, feeling a horrifying paralysis grip his nervous system. I can't, his mind screamed. I'm Quirkless. I'm useless. All Might said so. I can't do anything. If I run in there, I'll just be another hostage. I'll just make it worse.

 

The guilt was a physical agony, tearing at his insides, but the reality of his own utter powerlessness held him firmly in place.

 

Think, Izuku mentally begged himself, his eyes darting frantically around the chaotic scene. Don't act like a hero. Think like an analyst.

 

His eyes scanned the battlefield, bypassing the heroes, bypassing the villain, and locking onto the collateral damage. His mind, trained by a decade of obsessive observation, shifted into a hyper-analytical gear. He cataloged variables at lightspeed.

 

Villain's biology: Fluid, non-Newtonian, vulnerable to sudden pressure changes, specifically in the ocular region—the only solid construct. Hostage's quirk: Nitroglycerin sweat, requiring oxygen to ignite. The flames are sucking the oxygen out of the alley. The explosions are getting weaker. Time remaining until asphyxiation: forty seconds.

 

Izuku’s gaze dropped to the ground near the police barricade. Lying in a pile of rubble from a shattered storefront was a piece of discarded, broken Pro Hero support gear. It looked like one of Backdraft's auxiliary pressure valves—a heavy, cylindrical piece of steel and reinforced tubing designed to compress and rapidly expel fluid. It must have been blown off the hero's belt during an earlier explosion.

 

Next to it lay a jagged, heavy shard of hardened glass from the storefront.

 

Izuku didn't move as a hero. He moved as an equation.

 

Before anyone could stop him, Izuku ducked under the yellow police tape.

 

"Hey! Kid! Get back here!" a police officer yelled, reaching for him.

 

Izuku ignored him. He scooped up the heavy, damaged pressure valve in his left hand and the shard of hardened glass in his right. He didn't run toward the villain. That would be suicide. Instead, he calculated the angle, the distance, and the trajectory.

 

The valve is heavily pressurized, Izuku's mind fired off. The locking mechanism is cracked. If the structural integrity of the main cylinder is compromised, the compressed kinetic energy will seek the path of least resistance.

 

He gripped the valve tightly. He was fifty feet away. Bakugo launched another explosion, momentarily illuminating the villain's massive, fluid eye.

 

Izuku pulled his left arm back. He wasn't strong, but he had spent years analyzing the bio-mechanics of baseball pitchers and projectile-based heroes like Snipe. He stepped into the throw, transferring the kinetic energy from his legs, through his hips, into his shoulder.

 

He hurled the heavy metal cylinder in a high arc over the flames.

 

"What are you doing, you idiot?!" Death Arms roared.

 

Izuku didn't answer. He watched the cylinder sail through the smoky air. Just as it reached the apex of its arc, exactly ten feet directly in front of the Sludge Villain's massive eye, Izuku threw the shard of glass with all the speed he could muster.

 

He wasn't aiming for the villain. He was aiming for the valve.

 

Clink.

 

The sharp glass struck the cracked casing of the pressure valve mid-air. It was a one-in-a-million shot, guided by pure, desperate mathematical calculation. The glass pierced the compromised structural seal.

 

The result was instantaneous.

 

The highly compressed kinetic air inside the valve violently rapidly expanded. The cylinder didn't just break; it ruptured.

 

CRACK-BOOM!

 

It wasn't an explosion of fire; it was an explosion of pure, concussive pressure. A miniature sonic boom erupted right in front of the Sludge Villain’s face. The shockwave tore through the air, instantly extinguishing the immediate flames and hitting the villain's liquid body with the force of a speeding truck.

 

Because the villain was liquid, the shockwave rippled through his mass, violently displacing the sludge. The sudden, immense pressure hit the villain's sensitive eyes.

 

The Sludge Villain shrieked in agony, the liquid holding Bakugo violently loosening as the shockwave disrupted its cohesive form.

 

Bakugo, gasping for precious oxygen, ripped his mouth free of the sludge, inhaling a massive breath of air. The villain recoiled, stunned and disoriented by the sudden, localized pressure blast.

 

The alleyway fell dead silent for exactly three seconds.

 

Three seconds was an eternity for a Pro Hero.

 

Suddenly, a massive figure blurred past Izuku. The air pressure shifted so violently that Izuku was knocked backward onto the pavement.

 

"I really am pathetic," a deep, booming voice echoed through the alley.

 

Izuku looked up. Standing in front of the villain, smoke radiating from his massive, muscular frame, was All Might. He had reverted to his muscle form, blood leaking from his mouth, but his eyes burned with a terrifying, righteous fury.

 

"I told you the traits to make a great champion," All Might roared, drawing his right fist back, the sheer power gathering around his arm creating a visible vortex of wind. "But I failed to live up to my own ideals!"

 

The Sludge Villain shrieked, lunging forward in a desperate counterattack.

 

"TEXAS SMASH!"

 

All Might threw his punch. The shockwave was biblical. It dwarfed Izuku’s makeshift concussive blast by a factor of ten thousand. The air pressure literally changed the weather, generating a localized tornado that ripped the Sludge Villain into microscopic droplets, scattering him across the alleyway and freeing Katsuki Bakugo completely.

 

The wind howled, the clouds above violently dispersed, and it began to rain.

 

Izuku sat on the wet pavement, his hands trembling, staring at the sheer, god-like power of the Number One Hero.

 

That's power, Izuku thought, his heart pounding a frantic rhythm against his ribs. That's a Quirk. An impossible, insurmountable biological miracle.

 

The aftermath was a blur. The police collected the scattered sludge into containment units. Paramedics rushed to check on Bakugo, who sat wrapped in a shock blanket, coughing and glaring at the ground.

 

Izuku was surrounded by Kamui Woods and Death Arms. They weren't praising him. They were furious.

 

"Are you out of your mind?!" Death Arms barked, pointing a massive finger at Izuku's chest. "You threw a compromised piece of high-grade support tech at a hostage situation! Do you know how easily that pressure valve could have sent shrapnel into the victim's throat?! You didn't do anything but put yourself and others in danger, kid!"

 

"It wasn't a fragmentation shell," Izuku muttered, his voice barely a whisper, staring at his red sneakers. "The casing was reinforced carbon-steel. The structural failure point was localized to the release valve. I calculated the dispersal rate... the concussive force would push outward, not fragment inward..."

 

"What are you muttering about?" Kamui Woods sighed, rubbing his wooden temples. "Look, kid, leave the hero work to the professionals. You're lucky All Might stepped in when he did, otherwise your little stunt would have gotten you both killed."

 

Izuku didn't argue. He just nodded numbly. They were right. He wasn't a hero. He was a liability.

 

As he picked up his backpack and turned to leave, he felt a gaze burning a hole into the back of his head. He turned slightly. Bakugo was staring at him. There was no trademark rage in his red eyes, no explosive threats. Just a complex, unreadable expression. Bakugo opened his mouth to say something, but closed it, turning away with a scowl.

 

Izuku walked away, the rain soaking his green hair, pasting it to his forehead. He didn't look back.

 

He didn't notice All Might watching him from the shadows of an alleyway, clutching his side, his blue eyes wide with complex realization.

 

 

 

The walk back to his apartment was silent. The rain had stopped, leaving the streets slick and reflective under the glow of the streetlights.

 

When Izuku unlocked the door to his apartment, the smell of katsudon—his favorite—wafted from the kitchen.

 

"Izuku? Is that you?" Inko Midoriya called out, her voice laced with the perpetual hum of maternal anxiety. She peeked her head around the corner, her dark green hair tied back, wearing an apron over her casual clothes. When she saw her son, soaking wet, staring blankly at the floor, she gasped. "Oh my goodness, you're soaked! Did you forget your umbrella? Hurry, get out of those wet clothes before you catch a cold!"

 

"I'm fine, Mom," Izuku said, his voice flat, devoid of its usual nervous energy. He slipped off his shoes, lining them up neatly. "I'm just... really tired. I think I'm going to skip dinner tonight."

 

Inko’s face fell. "But... I made katsudon. Your favorite."

 

"I'm sorry," Izuku whispered, refusing to meet her eyes. "I just want to sleep."

 

He walked past her, the squelch of his wet socks the only sound in the hallway, and retreated into his bedroom, shutting the door behind him with a soft click.

 

Inko stood in the hallway, wiping her hands on her apron, her eyes welling with tears. She knew that look. It was the same look he had the day they came back from the quirk doctor. The look of a boy whose world had ended.

 

Inside his room, Izuku leaned against the door and slid down to the floor, pulling his knees to his chest.

 

He looked up.

 

His room was a shrine to a god who had just forsaken him. Posters of All Might plastered every square inch of the wallpaper. Action figures stood in victorious poses on his desk, his bookshelves, his dresser. The bedsheets bore the primary colors of the Symbol of Peace. Everywhere he looked, a giant, fearless smile mocked his existence.

 

Make sure they're realistic.

 

Izuku stood up. The numbness was receding, replaced by a cold, sharp clarity.

 

He walked over to the largest poster above his bed—a limited edition holographic print of All Might’s Silver Age debut. Izuku reached out, his fingers trembling slightly, and grasped the corner of the poster.

 

With a swift, harsh motion, he tore it down.

 

The tearing paper sounded like a gunshot in the quiet room. Izuku didn't stop. He moved like a machine. He tore down the posters, rolling them up and throwing them into the corner. He swept the action figures off his desk, the plastic clattering into a cardboard box he pulled from his closet. He stripped the bedsheets, tossing them into the laundry hamper.

 

In less than twenty minutes, the room was bare. Stripped of its color, stripped of its hero worship. It looked like a hospital room. Cold, clinical, and empty.

 

Izuku sat down at his desk. The only thing left on the wooden surface was his yellow backpack.

 

He unzipped it and pulled out a charred, slightly damp notebook.

 

Hero Analysis for the Future No. 13.

 

Bakugo had blown it up and thrown it out the window into a koi pond earlier that day. It felt like a lifetime ago. Izuku stared at the cover, tracing the singed edges with his thumb.

 

"Hero Analysis," he whispered to the empty room.

 

He opened the notebook. The pages were crinkled from the water, the ink slightly bled, but the contents were legible. He turned to the entry he had made that morning regarding the debut of Mount Lady.

 

He read his own handwriting.

 

Mount Lady. Quirk: Gigantification. Height increases to 2062 cm. Weight increases proportionally.

 

Izuku frowned, his eyes scanning further down the page, past the crude sketches of her costume.

 

Notes on biomechanics: If mass increases proportionally, the square-cube law dictates her skeletal structure would collapse under her own weight. Therefore, her Quirk must actively manipulate her cellular density, lowering her specific gravity while expanding her atoms, or drawing ambient mass from the environment. Her costume uses hyper-elastic polymers, likely a variation of woven polyurethane infused with carbon-nanotubes to prevent tearing during rapid expansion. Structural weakness: The caloric intake required to fuel rapid atomic expansion must be astronomical. Sustained use would result in severe hypoglycemia.

 

Izuku blinked. He turned the page to an entry on Katsuki Bakugo.

 

Katsuki Bakugo. Quirk: Explosion. Sweat glands on palms secrete a nitroglycerin-like compound.

 

He read the smaller, cramped notes in the margins.

 

Notes on thermodynamics and kinetic blowback: Nitroglycerin detonation velocity is approx 7,700 m/s. The recoil generated by a localized blast of that magnitude should theoretically shatter the radius and ulna bones in his forearms. Kacchan’s bone density and muscular tensile strength must be at least 4.5 times that of a normal human to withstand the kickback. To optimize output without catastrophic self-injury, a support item could be designed: a gauntlet shaped like a compression cylinder to direct the blast forward, mitigating radial energy loss and absorbing the kinetic shock into an internal dampening gel.

 

Izuku’s breath hitched.

 

He flipped through the notebook frantically. Page after page, hero after hero, villain after villain. He hadn't just been writing down what their Quirks did. He hadn't just been a fanboy collecting trading card stats.

 

He had been reverse-engineering their physics.

 

He had been calculating thermodynamics, tensile strength, kinetic energy transfer, aerodynamic drag, and biomechanical stress. He had been designing support gear in his margins to optimize biological anomalies.

 

I didn't throw that pressure valve today because I was brave, Izuku realized, staring at his hands. I threw it because I did the math. I saw the structural failure point. I calculated the concussive output.

 

His mind wasn't a fanboy's mind. It was a supercomputer.

 

Izuku looked up from the notebook, staring at the blank wall in front of him. The reflection of his desk lamp cast a stark, singular light across his face. The emerald in his eyes, previously clouded by hero worship and persistent despair, crystallized into something sharp, hard, and terrifyingly brilliant.

 

"A quirk is just a biological mechanism that bends the laws of physics," Izuku whispered, the words tumbling out of his mouth as the gears in his head began to turn at breakneck speed. "Endeavor manipulates thermal energy. Iida uses biological exhaust pipes for propulsion. Uraraka nullifies gravity."

 

He slammed his hands flat onto the desk.

 

"I don't need a biological anomaly to bend the laws of physics."

 

Izuku grabbed a fresh, blank notebook from his drawer. He grabbed a mechanical pencil.

 

"If I can't be born with a Quirk," he said, his voice trembling not with fear, but with raw, unadulterated adrenaline, "I'll build one."

 

He opened the blank notebook to the first page. He didn't write Hero Analysis for the Future.

 

In sharp, precise strokes, he wrote: Project: AEGIS - Exoskeletal Biomechanical Augmentation.

 

He spent the next six hours drawing. He didn't sleep. The exhaustion had evaporated, burned away by the hyper-fixation that now gripped his brain. He drew schematics. He calculated power-to-weight ratios. He designed servo-motors, hydraulic pistons, pneumatic actuators. He mapped out an exoskeleton that could replicate the kinetic force of a superhuman punch, the shock absorbers required to survive a multi-story fall, the propulsion systems needed to simulate flight.

 

When the sun finally peeked over the horizon, casting a pale, morning light through his window, Izuku Midoriya was no longer a Quirkless fanboy dreaming of a miracle.

 

He was an engineer looking at a blueprint.

 

 

 

The smell of salt and rotting garbage was overwhelming, but Izuku didn't care.

 

Dagobah Municipal Beach had once been a beautiful stretch of coastline, but years of illegal dumping by the residents of Musutafu and the shifting ocean currents had turned it into a colossal, stinking monument to human waste. Mountains of rusted refrigerators, crushed cars, broken appliances, and twisted metal stretched for miles along the sand.

 

To the rest of the city, it was a blemish. To Izuku Midoriya, stepping onto the sand in a pair of heavy work boots and a thick pair of canvas gloves he had bought with his allowance, it was the greatest gold mine on Earth.

 

It was 6:00 AM on a Saturday. The beach was utterly deserted.

 

"Okay," Izuku muttered, adjusting the straps of his heavy backpack, which was currently filled with screwdrivers, wrenches, a multimeter, and several thick library books on applied metallurgy, robotics, and electrical engineering. "First things first. I need a workshop."

 

He spent the first two hours climbing through the dangerous, jagged mountains of scrap, navigating the labyrinth of junk like an explorer in an urban jungle. He was looking for something specific. Something secluded, structurally sound, and hidden from the road above.

 

He found it near the water's edge, buried beneath a small mountain of rusted cars. It was a massive, discarded shipping container, likely washed ashore from a cargo spill years ago. The doors were jammed shut with rust, and it was partially buried in the sand, but the structural integrity of the corrugated steel was intact.

 

Izuku smiled.

 

It took him an hour of intense, grueling physical labor using a crowbar he found in a busted pickup truck to pry the rusted doors of the shipping container open. When they finally gave way with a deafening screech of metal, sunlight spilled into the cavernous, empty interior. It smelled of rust and old seawater, but it was dry.

 

"Perfect," Izuku breathed.

 

He didn't waste a second. Over the next week, Izuku’s life fell into a grueling, singular routine. He went to Aldera Junior High, ignoring Bakugo’s confused, suspicious glares at his sudden lack of muttering and lack of hero-stalking. He sat in class, perfectly silent, sketching circuit boards and coding algorithms in his notebooks under the desk. As soon as the final bell rang, he sprinted to Dagobah Beach.

 

He wasn't moving the trash to clean the beach or to train his body. He was scavenging.

 

His first massive victory was finding a discarded, gasoline-powered industrial generator buried under a pile of broken washing machines. It took him three days of taking apart the carburetor, cleaning the spark plugs, and rewiring the ignition coil, using knowledge he rapidly absorbed from the library books, but when he finally pulled the starter cord and the engine roared to life, spitting black smoke before settling into a steady, beautiful hum, Izuku cheered aloud.

 

He dragged the generator into the shipping container. He now had power.

 

Next came the tools. He found a broken arc welder in a discarded construction bin. He fixed the transformer unit using copper wire stripped from a dozen broken televisions. He built a makeshift workbench out of reinforced steel plating from a scrapped bulldozer. He scavenged an old, boxy computer monitor and a tower that had been thrown out by an office building, completely wiping the hard drive and installing a bare-bones Linux operating system he taught himself to code in a weekend.

 

By the end of the first month, the hollowed-out shipping container had been transformed. It was no longer a piece of trash; it was a Frankenstein’s monster of a laboratory. Wires hung from the ceiling, connected to scavenged halogen work lights. Tools were neatly organized on pegboards made of scrap wood. The hum of the generator was a constant, comforting heartbeat.

 

With his workshop established, Izuku began the build.

 

Project: Mark I.

 

The goal wasn't a full suit. That was impossible right now. He didn't have the materials, the power source, or the knowledge. The goal was proof of concept. He needed to build a single, functioning exoskeletal limb that could multiply his baseline physical strength.

 

He started with the right arm.

 

The frame was constructed from aircraft-grade aluminum he painstakingly cut from the wing of a scrapped Cessna airplane he found half-buried in the sand. It was lightweight but possessed incredible tensile strength.

 

The joints were the hardest part. Human biomechanics were incredibly complex. A simple hinge joint wouldn't allow for the necessary rotation of the wrist or the ball-and-socket mobility of the shoulder. Izuku spent two weeks agonizing over the math, eventually designing a multi-axis gimbal system using ball bearings he salvaged from car axles and motorcycle wheels.

 

"If the actuator misfires during a punch, the torque will snap my humerus in half," Izuku muttered to himself one rainy evening, illuminated only by the harsh, blue-white light of his welding torch. He lowered his welding mask, the sparks showering over his protective leather apron. "I need an inhibitor relay. A mechanical fail-safe that cuts the hydraulic pressure if the PSI exceeds my bone density threshold."

 

He worked like a demon. He burned his hands on hot metal, leaving angry red blisters across his palms. He cut his fingers on sharp steel, wrapping them in electrical tape when he ran out of bandages. He shocked himself so badly on a capacitor that he was thrown across the shipping container, laying on his back, gasping for air for ten minutes before getting right back up and recalibrating the voltage.

 

His mother noticed the changes. Izuku was coming home late, covered in grease, smelling of ozone and gasoline. He was eating massive amounts of food, his body burning calories at an insane rate just to keep up with the physical toll of the scrap hauling and the mental strain of the engineering.

 

"Izuku, honey, what are you doing every afternoon?" Inko had asked one night at dinner, eyeing the grease stains under his fingernails that no amount of scrubbing could remove.

 

"Just... an extracurricular project, Mom," Izuku had lied smoothly, not breaking eye contact. "The school started a robotics club. I’m building something for a competition."

 

It wasn't entirely a lie. He was building something. And the competition was every single Pro Hero on Earth.

 

Three months after the incident with the Sludge Villain, Izuku stood in the center of his shipping container workshop. It was 2:00 AM.

 

Resting on the heavy steel workbench was the Mark I prototype arm.

 

It was ugly. It was a bulky, exposed mess of silver aluminum plating, black hydraulic hoses, copper wiring, and crude, welded joints. It looked less like hero gear and more like a piece of industrial mining equipment ripped from a factory line. The gauntlet was oversized, designed to fit over his hand, with thick, pneumatic pistons running up the forearm, connected to a motorized winch system at the bicep.

 

It was powered by a heavy, cumbersome array of modified lithium-ion laptop batteries taped together and connected to a master power-switch on a belt harness.

 

Izuku took a deep breath. His heart was hammering a frantic, terrifying rhythm against his ribs. This is it, he thought. If the math is wrong, this thing is going to crush my arm.

 

He stepped up to the workbench. He slid his right arm into the cold, metal sleeve of the exoskeleton. He tightened the leather straps, securing the metal frame to his forearm, bicep, and shoulder. He strapped the heavy battery pack around his waist.

 

He plugged the main power cable from the battery pack into the receptor on the bicep joint.

 

"Okay," Izuku whispered, his voice trembling slightly in the quiet, metallic cavern of the shipping container. "System check. Manual power cycle."

 

He reached down to his belt with his left hand and flipped the master switch.

 

VHRRRMMMM.

 

The Mark I roared to life. A low, powerful whine filled the room as the scavenged servo-motors engaged. The hydraulic fluid pumped through the thick black hoses, causing the metal arm to twitch and hiss as pressure built within the cylinders. Tiny green LED indicator lights, salvaged from a broken router, flickered to life along the forearm casing.

 

Izuku gasped. He could feel it. The machine wasn't just strapped to him; it felt alive. He could feel the latent, hum of immense kinetic potential vibrating against his skin.

 

He slowly opened his right hand.

 

Clank.

 

The oversized, metal fingers of the gauntlet extended, matching the exact movement of his biological fingers underneath, driven by a series of high-tension steel cables.

 

He closed his hand into a fist.

 

CLACK.

 

The metal fist slammed shut with enough force to generate a small gust of wind.

 

Izuku’s emerald eyes widened. A slow, wild, utterly manic grin spread across his dirt-smudged face.

 

"Torque response is a zero-point-two second delay," Izuku rapidly muttered, his brain shifting into overdrive. "Acceptable for a prototype. Hydraulic pressure is holding steady at 1200 PSI. Motor temperature is nominal."

 

He turned away from the workbench. In the corner of the shipping container, he had set up a testing apparatus: a solid block of reinforced concrete, salvaged from a demolished building foundation, resting on top of a stack of wooden pallets. It was roughly two feet thick.

 

Izuku walked over to the concrete block. He planted his feet, shoulder-width apart, ensuring his stance was grounded. He didn't know martial arts. He just knew the physics of kinetic transfer.

 

He pulled his right arm back. The hydraulic pistons on his bicep hissed, retracting, building potential energy like a coiled spring. The servo-motors whined, pitching upward in frequency.

 

"Test one," Izuku breathed. "Twenty percent output."

 

He threw the punch.

 

He didn't just use the machine; he used his own body, twisting his hips and throwing his shoulder into the motion. As his biological muscles engaged, the biometric sensors inside the gauntlet detected the movement and fired the pneumatic actuators simultaneously.

 

The arm shot forward with terrifying, blinding speed. It was so fast the heavy metal blurred.

 

KRA-KOOM!

 

The metal fist struck the center of the reinforced concrete block.

 

The sound was deafening, like a cannon firing inside the small metal box. The kinetic shockwave traveled up Izuku’s arm. The internal dampeners he had designed took the brunt of the blow, but the force was still immense. He was pushed backward, his boots skidding across the dirt floor of the container.

 

The wooden pallets beneath the concrete splintered and shattered into a thousand pieces.

 

Izuku stumbled back, gasping, gripping his right shoulder with his left hand. It ached fiercely, a dull, throbbing pain, but the bone wasn't broken. The fail-safes had worked.

 

He looked up through the cloud of concrete dust filling the workshop.

 

The concrete block wasn't just cracked. It had a massive, cratered hole blown directly through the center of it. The rebar inside was twisted and snapped like dry twigs. The back half of the block had exploded outward, spraying concrete shrapnel against the back wall of the shipping container.

 

Izuku stared at the destruction. He looked down at the Mark I arm. The metal knuckles were scratched and covered in white dust, a slight hiss of steam venting from the pressure release valves, but the frame was completely intact.

 

It worked.

 

He had just punched through two feet of solid, reinforced concrete. A Quirkless, fourteen-year-old boy had just generated the kinetic output of a low-tier Pro Hero.

 

Izuku began to laugh.

 

It started as a small, breathy chuckle, but rapidly grew into a full-throated, echoing laugh that bounced off the corrugated steel walls of his hidden sanctuary. It was a laugh of pure, unadulterated triumph. It was the sound of a boy who had been told to accept reality, who had decided instead to take a hammer to reality and forge it into something new.

 

All Might had told him to be realistic.

 

Izuku looked at the shattered concrete, the whining, glowing mechanical arm grafted to his body, and the blueprints for the rest of the suit pinned to his pegboard.

 

"I'm going to change the world," Izuku whispered into the dusty air.

 

He reached over and flipped the power switch. The arm powered down with a dying whine, the hydraulic pressure releasing with a loud hiss.

 

He had the strength. He had the proof of concept. But the Mark I was a crude, tethered toy. It was too heavy, too reliant on bulky batteries that would drain in minutes during sustained combat. If he was going to build a full suit—an armor that could fly, that could take a hit from a villain, that could rival Katsuki’s explosions—he needed a miracle.

 

He needed to miniaturize an industrial power grid. He needed to build an engine capable of sustaining massive energy output without melting down. He needed better materials, high-tech machining tools, and a laboratory that wasn't a rusty box on a beach.

 

He needed to get into U.A. High School. Not the Hero Course. They wouldn't let him use his gear in the entrance exam.

 

He needed the Support Course.

 

Izuku began unstrapping the Mark I, his mind already racing ten steps ahead. He had exactly seven months until the U.A. Entrance Exam. Seven months to learn everything there was to know about advanced power systems, AI programming, and aerodynamics.

 

The Quirkless fanboy had died on that rooftop.

 

The Engineer had been born in the cave.

 

 

 

 

 

The towering, glass-paneled H-shaped building of U.A. High School gleamed under the crisp February sun, a monument to the extraordinary. It was a fortress where gods were forged, where the biologically gifted came to refine their world-shaking talents under the tutelage of legends.

 

Izuku Midoriya stood before the massive golden gates, his breath pluming in the chilly morning air.

 

Ten months ago, he would have looked at this building with a heart full of desperate, trembling reverence. He would have felt an overwhelming sense of inadequacy, viewing himself as a microscopic speck of dust daring to cast a shadow on Mount Olympus.

 

Today, as he adjusted the strap of the heavy, reinforced duffel bag slung over his shoulder, he didn't feel reverence. He felt a cold, calculating hunger.

 

The Hero Course practical exam is happening in City A through G, Izuku thought, his eyes scanning the throngs of excited, nervous teenagers streaming through the gates. They’re fighting massive, multi-million-yen robots. They’ll be judged on destructive output, combat instincts, and rescue points.

 

He watched a boy with engines protruding from his calves sprint past, followed by a girl who seemed to be floating slightly above the pavement.

 

Biological advantages, Izuku noted, his mind automatically running thermodynamic and aerodynamic calculations on the engine-boy’s calves. Impressive, but ultimately limited by physical stamina and the immutable laws of their own flesh.

 

Izuku gripped his duffel bag tighter. Inside was thirty pounds of salvaged metal, rerouted wiring, and sheer, defiant ingenuity.

 

He wasn't here to break robots with his bare hands. He was here to break the rules.

 

Izuku turned away from the main thoroughfare leading to the Hero Course orientation and followed the signs pointing toward the eastern wing of the campus: the Development Studio. The U.A. Support Course entrance exam was entirely different from the Hero Course. It was split into two grueling phases: a three-hour written examination covering advanced mathematics, physics, and material science, followed by a live demonstration of a prototype before a panel of master engineers.

 

The written exam was a blur.

 

Sitting in a massive lecture hall filled with hopeful mechanics and tech-savvy teens, Izuku felt as if he were operating on a different frequency. When the proctor, the Pro Hero Snipe, signaled the start, Izuku opened his booklet and almost laughed.

 

The questions were complex, undoubtedly designed to weed out amateurs. Calculate the tensile strain on a carbon-fiber tether supporting two metric tons swinging at a 45-degree trajectory. Identify the thermal degradation point of woven Kevlar-Nomex composites when exposed to localized plasma bursts.

 

To Izuku, this wasn't a test. It was the language he had been speaking in the rusty darkness of his shipping-container workshop for ten months. It was the math he had used to ensure his Mark I gauntlet didn't rip his arm from its socket. He tore through the booklet, his pencil a blur of graphite and hyper-fixation. He didn't just solve the equations; he wrote marginal notes on how to optimize the proposed designs.

 

He finished the three-hour exam in forty-five minutes.

 

When he stood up to hand his booklet to Snipe, the masked hero stared at him from behind his visor. "You give up already, kid? No shame in it. This is college-level stuff."

 

"I'm finished, sir," Izuku replied politely, setting the booklet on the desk. "I'll be waiting in the demonstration holding area."

 

Snipe watched the green-haired boy walk away, shaking his head. He glanced down at the first page, expecting blank space. Instead, he saw a wall of perfect, microscopic equations that not only answered the first question but corrected a flaw in the test’s structural premise. Snipe’s jaw dropped beneath his mask.

 

Phase two took place in a reinforced, blast-proof subterranean bunker beneath the Development Studio.

 

When Izuku’s name was called, he carried his heavy duffel bag into the center of the room. The air smelled of ozone and scorched metal from previous applicants. Behind a thick wall of bulletproof glass sat the judging panel: Power Loader, the excavator hero and head of the Support Department; Ectoplasm, the math instructor; and a small, white, bear-mouse-dog creature wearing a tailored suit. Principal Nezu.

 

"Applicant number 711, Izuku Midoriya," Power Loader said into a microphone, his voice echoing through the bunker. The hero looked tired, his eyes scanning Izuku’s file. "Let's see here... you've applied exclusively for the Support Course. No Hero Course application. Quirk... registered as Quirkless." Power Loader paused, looking up from the file with a raised eyebrow. "Well, that's rare. What have you brought to show us today, Midoriya?"

 

Izuku unzipped his duffel bag.

 

"A Quirk," Izuku said, his voice remarkably steady.

 

He pulled out a bulky, heavily modified gauntlet that stretched from the knuckles to the elbow. It wasn't the Mark I. The Mark I was a hydraulic strength-enhancer. This was something entirely new, built from the gutted remains of three microwaves, a commercial car battery, and a heavily magnetized copper coil. It was painted a matte, heat-resistant black.

 

Izuku slid his right arm into the gauntlet, tightening the heavy straps. He clipped the car battery, now modified into a condensed power pack, onto his belt, plugging a thick, insulated cable into the gauntlet's base.

 

Behind the glass, Nezu leaned forward, his beady black eyes glittering with sudden, intense interest.

 

"Explain the device, Midoriya," Nezu requested, his high-pitched voice polite but piercing.

 

"Pro Heroes who rely on close-quarters combat are at a severe disadvantage against villains with area-of-effect or ranged Quirks," Izuku began, tapping the side of the gauntlet. "To bridge this gap, I designed the Kinetic Repulsion Gauntlet. It utilizes salvaged magnetron tubes from consumer microwaves, heavily over-volted, to superheat the air molecules inside this focal chamber." He pointed to a circular, hollow emitter on the palm.

 

"By trapping the superheated, expanding air within a localized electromagnetic field, I can condense kinetic energy," Izuku continued, his voice picking up speed, slipping into his analytical cadence. "When the magnetic seal is broken, the concussive force seeks the path of least resistance. It's essentially a directional, non-lethal shockwave projector."

 

Power Loader frowned. "You built a localized sonic cannon out of microwaves? Kid, if the magnetic seal fails, that localized pressure will blow your hand clean off."

 

"I've calculated the structural integrity of the firing chamber," Izuku said firmly. "The recoil is dispersed through an internal non-Newtonian fluid shock absorber system. I request permission to demonstrate on the blast dummy."

 

Power Loader exchanged a glance with Nezu. The principal nodded enthusiastically.

 

"Proceed," Power Loader said.

 

Izuku turned toward the heavy, reinforced steel dummy bolted to the far end of the room. He planted his feet, taking a deep breath. He visualized the mathematics. He visualized the sludge villain.

 

He raised his right hand, palm facing the dummy.

 

He squeezed the internal trigger mechanism.

 

The gauntlet whined, a high-pitched, terrifying sound like a jet engine spinning up. A blinding, pale blue light began to glow from the circular emitter on Izuku's palm. The air around his hand visibly distorted from the sudden, immense heat.

 

Firing, Izuku thought.

 

BZZZZT-KABOOM!

 

The sound wasn't a standard explosion. It was a violent, percussive crack of displaced air. A visible ring of white kinetic force shot from Izuku’s palm. It crossed the fifty-foot room in a microsecond and slammed into the steel dummy.

 

The heavy steel target didn't just rattle. The torso violently caved inward with a horrific screech of warping metal. The thick titanium bolts holding the dummy to the concrete floor sheared clean off, and the thousand-pound mass of steel was launched backward, smashing into the blast-proof wall behind it with a deafening crash.

 

Silence descended on the bunker. Smoke curled from the palm of Izuku's gauntlet.

 

Izuku didn't flinch. He lowered his arm, venting a small hiss of steam from the gauntlet's cooling ports. He turned back to the glass.

 

Power Loader was standing up, his jaw slack, staring at the ruined, smoking steel dummy embedded in the concrete wall. Ectoplasm had leaned so far forward his metallic jaw was nearly touching the glass.

 

Principal Nezu steepled his paws, a terrifying, predatory smile spreading across his snout.

 

"Outstanding," the principal whispered.

 

"The power draw is currently too inefficient for sustained combat," Izuku noted critically, tapping the smoking gauntlet. "The capacitor requires a four-second recharge between blasts, and the thermal output risks melting the copper wiring after six consecutive uses. But as a proof of concept for mechanized, high-yield kinetic emission, it functions as intended."

 

Power Loader slowly sank back into his chair. He looked from the destroyed dummy to the fourteen-year-old Quirkless boy standing in the center of the room.

 

"Midoriya," Power Loader said, his voice laced with a mixture of awe and deep concern. "Where did you learn to build a weaponized particle-displacement engine?"

 

"A beach, sir," Izuku replied honestly.

 

Two weeks later, an acceptance letter arrived. Izuku hadn't just passed; he had shattered the historical record for the written exam, scoring a perfect 100%. The holographic projection from Power Loader informed him he had been placed in Class 1-H, the premier class of the Support Department.

 

The Iron Hero had a home.

 

 

 

The first day of U.A. High School was a study in contrasts.

 

While the students of Class 1-A sat in a pristine, brightly lit classroom, wearing immaculate uniforms and listening to an exhausted underground hero in a yellow sleeping bag, the students of Class 1-H were standing in a room that looked like an industrial war zone.

 

Development Studio Alpha was a massive, cavernous warehouse filled with heavy machinery, CNC mills, arc welders, 3D printers, and towering racks of raw materials. The smell of grease, hot metal, and engine coolant hung heavily in the air.

 

Izuku stood by his assigned workbench, carefully laying out his specialized tools. He felt a profound sense of peace. This was his element.

 

"Alright, listen up, gremlins," Power Loader barked, stepping to the front of the studio. He was wearing his heavy excavator helmet, his arms crossed. "Welcome to 1-H. You are here because you have brilliant minds. But brilliance without discipline is just an explosion waiting to happen. In this room, safety is paramount. If you blow up your workstation, you fail. If you blow up your classmate, you are expelled. My job is to make sure your inventions don't kill you before you graduate."

 

Power Loader sighed, rubbing the bridge of his nose. "You'll be working on independent projects, fulfilling requests from the Hero Course, and pushing the boundaries of support tech. Pick a workstation, find a partner if you want one, and get to work. I'll be reviewing your initial design proposals."

 

Izuku immediately opened his notebook. He had moved past the Mark I and the repulsor prototype. He was mapping out the exoskeleton for the Mark II—a full-body suit.

 

"Hey! You!"

 

Izuku blinked, looking up.

 

Marching toward him with the intensity of a hurricane was a girl with wild, thick dreadlocks the color of bubblegum pink. She was wearing overalls stained with engine grease, her eyes hidden behind a pair of thick, heavy-duty steampunk-style goggles. In her hands, she held a massive, terrifying-looking wrench.

 

She slammed the wrench down onto Izuku's workbench, the metal clanging loudly.

 

"I saw the footage of your entrance exam," she announced, her voice incredibly loud and vibrating with manic energy. She leaned in, her goggles practically touching Izuku’s nose. The goggles had crosshairs etched into the lenses. "You're the kid who built a kinetic cannon out of consumer microwaves. I'm Mei Hatsume. I'm a genius. You're a genius. Your power efficiency was terrible, by the way. You bled thirty percent of your kinetic yield through thermal radiation because you used standard copper coils instead of a gold-titanium alloy."

 

Izuku leaned back, overwhelmed by her sheer proximity and volume. "Uh... hi. I'm Izuku Midoriya. And I know about the thermal bleed, but I didn't have access to gold-titanium on a beach. I had to make do with what I—"

 

"I'm claiming you," Mei interrupted, pointing a grease-stained finger at his chest.

 

"Claiming me?" Izuku squeaked.

 

"As my lab partner!" Mei declared, throwing her arms wide. "I watched your exam! You're a structural genius, but your machining is a disaster! Look at these welds on your prototype sketch!" She pointed to Izuku’s open notebook. "Sloppy! If you put a high-torque servo in that joint, it'll shear the pin in half! I, however, am a virtuoso of the forge! I can machine parts with microscopic precision!"

 

Izuku looked at her. He looked down at his sketches. She was right. His theoretical math was flawless, his coding was pristine, but his physical manufacturing skills were limited to whatever he could bash together with scavenged tools.

 

"What do you propose?" Izuku asked, his analytical mind engaging.

 

Mei slammed her hands on the table. "A symbiotic partnership! I build the babies! I machine the parts, I forge the alloys, I handle the heavy lifting! You do the math! You write the code, you balance the structural integrity, and you figure out how to stop things from exploding when I push them past the redline! We will conquer the support world!"

 

Izuku stared at the manic, pink-haired girl. He saw the fire in her eyes—the exact same fire that burned in his own. She wasn't bound by conventional rules. She saw the world as a sandbox of variables waiting to be manipulated.

 

"I'm building a powered exoskeleton," Izuku said quietly, his voice dropping into a serious, intense register. "A full-body suit designed to rival high-tier biological quirks. It requires precision machining, lightweight armor plating, and an internal dampening system capable of absorbing immense kinetic shock."

 

Mei’s jaw dropped. A terrifying, beautiful smile spread across her face.

 

"A wearable tank?" she whispered, practically drooling.

 

"Yes."

 

"I'm in," Mei said immediately. She stuck out her hand.

 

Izuku shook it. At that exact moment, a partnership was forged that would eventually give Power Loader an ulcer and change the hierarchy of the hero world forever.

 

"First problem," Izuku said, opening his notebook and flipping to a complex schematic of the Mark II. "The power supply. The repulsor gauntlet I built drains a car battery in six shots. To power a full-body exoskeleton, including flight stabilizers, life support, and offensive kinetic blasts, the energy requirements are astronomical. Standard lithium-ion batteries are too heavy. If we add enough batteries to power the suit for a thirty-minute combat engagement, the suit becomes too heavy to move."

 

Mei frowned, taking off her goggles to look at the math. Her yellow eyes, featuring a crosshair-like mutation from her Zoom quirk, scanned the numbers.

 

"He's right," she muttered. "Even if I machine the armor out of an ultra-light carbon-titanium weave, the weight of the batteries required to power the servos will ground it. We're hitting a wall. We need a power source that produces massive output but weighs practically nothing."

 

"We need a localized nuclear reactor," Izuku deadpanned.

 

Mei looked at him, her eyes wide. "Midoriya... U.A. has a great budget, but I don't think Nezu is going to let us buy weapons-grade uranium."

 

"Not uranium," Izuku said, tapping his pen rapidly against the desk. "Look at this."

 

He pulled out one of his old Quirk Analysis notebooks. He opened it to an entry on Endeavor.

 

"Endeavor generates temperatures exceeding three thousand degrees Celsius," Izuku muttered rapidly. "If his body burned calories to create that heat, he would starve to death in five minutes. He doesn't burn calories. His Quirk acts as a localized, self-sustaining thermodynamic loop. It draws energy, amplifies it, and cycles the exhaust back into the system."

 

Izuku looked up at Mei, his emerald eyes burning.

 

"We don't need a battery. Batteries store power. We need an engine. A generator that sustains its own loop."

 

Thus began the longest, most agonizing month of Izuku Midoriya’s life.

 

While the Hero Course students were running through rescue exercises and combat trials, Izuku and Mei practically lived in the U.A. underground labs. Power Loader had given them special clearance, largely because he was simultaneously terrified and deeply fascinated by whatever the two prodigies were concocting.

 

They hit a wall of physics.

 

Izuku’s theory was sound: a miniature, self-sustaining kinetic feedback loop. He designed a circular housing unit that would trap high-energy ions in a perpetual magnetic field, forcing them to collide and generate massive amounts of clean electrical power.

 

The problem was the core element.

 

"Copper melts," Izuku muttered, running his hands through his greasy green curls. It was 3:00 AM on a Tuesday. The lab was littered with crushed coffee cans and crumpled blueprints. "Platinum is too dense to allow for rapid ionic transfer. We need a conductive element that can withstand immense heat and handle a constant, rapid bombardment of electrons without degrading."

 

Mei was asleep under the workbench, clutching a blowtorch like a teddy bear.

 

Izuku stared at the periodic table projected on the holographic monitor. His eyes glazed over the elements. Iron. Cobalt. Nickel.

 

His eyes stopped on element 46. Palladium.

 

"Palladium," Izuku whispered. He rapidly pulled up U.A.'s metallurgical database. "High melting point. Remarkable ability to absorb hydrogen... Wait. If we use a palladium core, and bombard it with a specific isotope..."

 

He began typing frantically. The mathematical models ran across the screen. The simulation showed the palladium core stabilizing the reaction, containing the kinetic energy, and outputting a massive, steady stream of raw electrical power.

 

The simulation hit 100% stability.

 

"Hatsume!" Izuku yelled, kicking the leg of the workbench.

 

Mei shot up, slamming her head on the bottom of the table. "I'm awake! The babies are fine!"

 

"Look at the screen!" Izuku pointed. "Palladium! It stabilizes the reaction loop! If we construct a toroidal magnetic chamber and house a palladium ring at the center, we can generate a self-sustaining arc of clean energy!"

 

Mei rubbed her head, her eyes focusing on the simulation. Her jaw dropped. "Midoriya... that output... that's gigajoules of energy. That's enough to power the entire U.A. campus for a week. And you want to put it in a box the size of a grapefruit?"

 

"Not a box," Izuku said, grinning. "A chest piece."

 

They requested the materials from U.A. logistics. When Power Loader saw the requisition form for high-grade palladium, superconducting wire, and electromagnetic shielding, he nearly had a heart attack, but Nezu signed off on it immediately, his curiosity thoroughly piqued.

 

The assembly of the core took three days of agonizing precision.

 

Mei handled the physical construction. Watching her work was like watching a surgeon. She used a high-powered laser scalpel to carve the toroidal housing out of a solid block of heat-resistant ceramic. She wound the microscopic copper-alloy wiring around the magnetic ring with a steady hand that belied her usual chaotic energy.

 

Izuku handled the dangerous part.

 

Wearing a heavy lead-lined apron and thick protective goggles, Izuku stood before a specialized containment box. Using remote manipulator arms, he carefully aligned the small, glowing piece of palladium into the center of the magnetic ring.

 

"Electromagnets are engaged," Mei called out from the monitoring console, her eyes glued to the telemetry. "Field stability is at ninety-nine percent. If this goes wrong, Midoriya, the resulting plasma burst is going to vaporize the entire eastern wing of the school."

 

"It won't go wrong," Izuku said, his voice calm. He didn't feel fear. He felt the cold, hard certainty of his own math.

 

"Initiating the isotopic reaction... now."

 

Izuku pressed the ignition switch.

 

For a terrible, agonizing second, nothing happened. The lab was dead silent, save for the hum of the ventilation system.

 

Then, a deep, resonant THUM vibrated through the floorboards. It sounded like a massive heartbeat.

 

Inside the containment box, the circular device came alive.

 

A blinding, beautiful, luminescent green light erupted from the center of the ring. It wasn't the harsh, erratic blue of the repulsor prototype. It was a steady, pulsing emerald glow. The light bathed the dark laboratory, casting long shadows against the walls.

 

"Telemetry?" Izuku asked, his voice barely a whisper, afraid that speaking too loudly might break the spell.

 

Mei was staring at the monitor, her mouth hanging open.

 

"Energy output is... it's off the charts," she breathed. "Three gigajoules per second. Thermal radiation is contained. Magnetic field is holding at one hundred percent stability. Midoriya... it's generating its own power. It's a localized, infinite battery."

 

Izuku stared at the glowing green ring. It looked like a brilliant emerald trapped in a cage of wire and ceramic.

 

"Not a battery," Izuku corrected softly. "A heart."

 

They called it the Emerald Core. With the energy crisis solved, the true work began.

 

 

 

The Mark II exoskeleton was a symphony of engineering.

 

With the Emerald Core providing virtually limitless power, Izuku’s designs were no longer constrained by weight limits. Mei went into a machining frenzy. She forged the armor plating using a proprietary alloy she invented: a weave of aeronautical titanium interlaced with carbon-nanotubes. It was incredibly lightweight, yet possessed a tensile strength capable of withstanding a direct blow from a hydraulic press.

 

The suit was sleek, designed to mimic the human musculature for maximum aerodynamic efficiency. Gone were the exposed wires and bulky hydraulic pistons of the Mark I. Everything was internalized. The servos driving the joints were micro-engineered, providing Izuku with the proportional physical strength to lift three tons.

 

"Color scheme?" Mei asked one afternoon, holding a spray gun connected to an industrial paint vat.

 

Izuku looked at the raw, silver metal of the armor resting on the assembly gantry. "Make it green," he said softly. "A deep, metallic forest green. With matte black secondary plating."

 

He didn't want to look like All Might. He didn't want the primary reds, blues, and yellows. He was forging a new path. He wanted the suit to look tactical, grounded, and distinctly his own.

 

While Mei painted and polished the physical armor, Izuku tackled the brain of the machine.

 

A suit this complex couldn't be piloted manually. The human reaction time was too slow. To fly, to calculate vector thrusts, to monitor power distribution in the middle of combat, Izuku needed an onboard operating system that could process information at the speed of a supercomputer.

 

He didn't build an OS. He built a mind.

 

Izuku spent a week feeding ten years' worth of his "Hero Analysis for the Future" notebooks into a self-learning neural network. He inputted every variable he had ever calculated: the aerodynamic drag of Kamui Woods, the kinetic kickback of Endeavor’s flames, the thermodynamic properties of Katsuki Bakugo’s explosions. He wrote algorithms that could predict combat movements based on biological tells. He integrated a comprehensive targeting system, environmental sensors, and a voice-recognition interface.

 

He named the network A.T.L.A.S. — Advanced Tactical Logistics & Analysis System.

 

Late one night, the final week before the U.A. Sports Festival, Izuku sat at his console in the empty lab. Mei had passed out on a cot in the corner. The Mark II suit hung in the gantry, fully assembled, gleaming in the dim light. The Emerald Core was slotted perfectly into the circular housing in the center of the chest plate, casting its soft green glow across the room.

 

Izuku plugged a datalink cable from the main U.A. server into the back of the suit's helmet.

 

He typed the final line of code and pressed 'Execute'.

 

A low hum filled the room. The eyes of the helmet, previously blank, suddenly illuminated with a sharp, piercing white light.

 

A voice, crisp, distinctly British in cadence, but layered with a slight, synthetic echo, emanated from the suit's external speakers.

 

"Systems initializing. Diagnostics running. Armor integrity at one hundred percent. Power core stable at optimal output."

 

Izuku felt a shiver run down his spine. "Hello, A.T.L.A.S."

 

"Good evening, Midoriya. Neural network integration is complete. My predictive combat algorithms have been successfully calibrated with your handwritten data. I must say, your analysis of Pro Hero structural weaknesses is... rather terrifying."

 

Izuku smiled. "That's the point. Run a localized flight check. Repulsor thrusters at ten percent."

 

"Executing."

 

The boots of the suit suddenly flared with a burst of pale blue energy. The suit hovered two inches off the gantry platform, perfectly stable, before setting back down.

 

"It's ready," Izuku whispered.

 

"You bet your ass it is," Mei mumbled from the cot, not opening her eyes. "We're going to make so much money off these patents."

 

Izuku ignored her capitalistic mumbling. He stood up and walked over to the gantry.

 

He needed to test it. Not the systems. Himself.

 

"A.T.L.A.S., prepare the armor for user interface."

 

"Opening casing."

 

The Mark II hummed. With a complex series of pneumatic hisses and mechanical clicks, the front of the suit opened up like a metallic flower, revealing the padded, heavily wired interior.

 

Izuku took a deep breath. He stepped backward into the suit.

 

As soon as his heels touched the boots, the armor responded. The leg plates snapped shut around his calves and thighs. The torso unit clamped securely around his chest, locking the Emerald Core over his actual heart. The gauntlets slid over his arms, the metal fingers syncing instantly with his own.

 

Finally, the helmet lowered from the gantry, sliding over his head. The faceplate snapped shut with a heavy, definitive CLANG.

 

Total darkness.

 

Then, Izuku’s world exploded with information.

 

The Heads-Up Display (HUD) blazed to life inside the helmet. Holographic data streamed across his vision. Altimeters, gyroscopic balances, targeting reticles, power readouts, and a miniature map of the U.A. campus.

 

"User interface established," A.T.L.A.S. spoke directly into his ears via the internal comms. "Pulse rate elevated. Adrenaline levels spiking. Are you quite alright, sir?"

 

"I'm perfect," Izuku said, his voice altered by the suit's external speakers, transforming into a deep, mechanical resonance that commanded the room.

 

Izuku took a step forward.

 

He expected the suit to feel heavy, like he was dragging a car around. Instead, it felt like he was wearing nothing at all. The micro-servos anticipated his muscle movements, moving the massive metal frame with fluid, terrifying grace. He wasn't piloting a machine. The machine was an extension of his body.

 

He raised his right hand. The targeting reticle in his HUD tracked his eye movement, locking onto a discarded coffee cup on a distant table.

 

"A.T.L.A.S., repulsor power to five percent. Non-lethal concussive blast."

 

"Target locked."

 

The whine of the gauntlet was smoother, quieter than the prototype. The stabilizer ring expanded.

 

Pew.

 

A precise, condensed bolt of kinetic energy shot across the room, vaporizing the coffee cup without singeing the table beneath it.

 

"Accuracy is flawless," Izuku noted. He looked down at the Emerald Core glowing in his chest. "Let's see if we can defy gravity."

 

Sneaking out of the U.A. Development Studio at 4:00 AM was technically a violation of a dozen school rules, but Izuku had bypassed the security cameras an hour ago using A.T.L.A.S. to loop the feed.

 

He stood in the center of Ground Beta, the massive, fake city used for Hero Course training. The concrete buildings loomed like silent titans in the darkness. The sky above was a deep, starless black.

 

Izuku stood in the middle of a deserted intersection.

 

"A.T.L.A.S., allocate twenty percent power to the boot thrusters and ten percent to the palm stabilizers. Vector thrust control."

 

"Power diverted. Sir, I must advise you, we have not conducted any wind-tunnel testing. The aerodynamic variables of a bipedal human frame in sustained flight are highly volatile."

 

"We'll test it live," Izuku said, a wild grin spreading across his face beneath the helmet. "Initiate thrust on my mark. Three. Two. One. Mark."

 

Izuku ignited the repulsors.

 

VHRROOOOM!

 

The sound tore through the quiet city. Two massive pillars of pale blue light erupted from his boots, shattering the asphalt beneath him.

 

Izuku shot into the air like a rocket.

 

"WHOAAAA!" Izuku screamed, his stomach dropping to his feet.

 

He didn't float. He ascended with violent, terrifying velocity. The G-force pressed him against the back of the armor. Within three seconds, he cleared the fake skyscrapers of Ground Beta. He kept going, piercing the low-hanging cloud cover.

 

"Sir, your trajectory is unstable," A.T.L.A.S. warned, the AI’s voice entirely unbothered by the fact they were thousands of feet in the air. "Adjusting gyroscopic stabilizers."

 

Izuku flailed his arms. "How do I steer?!"

 

"Use your hands, sir. The palm repulsors act as directional thrusters. Physics dictates that every action has an equal and opposite reaction."

 

Izuku forced himself to calm down. Right. Physics.

 

He leveled his arms out in front of him, palms facing downward, and fired the hand repulsors. The immediate opposing force hit his upper body, pitching him forward. Suddenly, he wasn't rocketing straight up; he was flying horizontally.

 

He leveled out, soaring high above the city of Musutafu.

 

The wind howled against the green metal plating. The HUD tracked his speed. Mach 0.8. He was breaking the sound barrier.

 

Izuku looked down. The city lights spread out beneath him like a glittering sea of gold and neon. He saw the winding river, the sprawling highways, the tiny, insignificant speck of the apartment building where his mother was currently sleeping.

 

He had done it.

 

Without a quirk, without a biological miracle, using nothing but his brain, scrap metal, and an obsessive need to prove the world wrong, he had conquered the sky.

 

Izuku leveled his arms and banked sharply to the left, carving a path through the clouds. He let out a loud, echoing laugh that vibrated through the comms.

 

"Your serotonin levels are currently operating at maximum capacity, sir," A.T.L.A.S. noted dryly. "Shall we continue the flight test?"

 

"Take me higher, A.T.L.A.S.," Izuku commanded, his eyes fixed on the horizon, where the first faint rays of dawn were beginning to break.

 

The Emerald Core pulsed brightly in the center of his chest.

 

"The Sports Festival is in three days," Izuku said to the empty sky. "It's time to introduce the world to the Iron Hero."

 

With a thunderous sonic boom, a streak of green and gold shot across the Musutafu skyline, leaving a trail of displaced clouds in its wake. Down below, early morning commuters looked up, wondering what new Pro Hero had just debuted.

 

They had no idea. The age of biology was ending. The age of technology had begun.

 

 

 

 

The U.A. Sports Festival was not merely a school event; it was a modern-day gladiatorial spectacle, a national holiday where the entire country of Japan ground to a halt to witness the birth of its future gods. The massive, oval stadium located on the U.A. campus could seat over a hundred thousand people, and every single seat was filled. The roar of the crowd was a physical entity, a tidal wave of sound that vibrated through the concrete foundations and rattled the teeth of anyone standing in the subterranean staging tunnels.

 

High above the arena, in the VIP broadcasting booth, the Pro Hero Present Mic adjusted his headset, his voice booming over the state-of-the-art stadium speakers.

 

"LADIES AND GENTLEMEN! ARE YOU READY FOR THE GREATEST SHOW ON EARTH?! WELCOME TO THE U.A. SPORTS FESTIVAL!"

 

Down in the 1-A prep room, the atmosphere was suffocatingly tense. The elite Hero Course students stretched, hyperventilating in quiet corners, or, in Katsuki Bakugo’s case, sitting in deadly, explosive silence. They had survived the USJ villain attack. They were the stars of the show. They were ready to prove their biological supremacy.

 

In a starkly different room, down the hall in the Support Course staging area, Izuku Midoriya was drinking a juice box.

 

He was wearing the standard-issue U.A. P.E. uniform—a dark blue tracksuit with thick white lines. Resting on the bench beside him, however, was something entirely non-standard. It was a massive, rectangular briefcase made of brushed titanium, trimmed in matte black, with a biometric locking mechanism on the handle. It was roughly the size of a cello case, but significantly thicker.

 

Mei Hatsume was pacing back and forth in front of him, practically vibrating out of her boots.

 

"I still think we should have installed the multi-barrel paint-pellet gatling gun," Mei muttered, chewing her thumbnail. "It's non-lethal, highly demoralizing, and excellent for branding."

 

"Mei, we talked about this," Izuku said calmly, crushing the empty juice box and tossing it into a bin. "The Mark III isn't just about showing off your babies. It's about proving a fundamental paradigm shift to the Pro Hero society. Paint guns are a gimmick. We are going to show them raw, undeniable, calculated power."

 

The journey to this room had not been easy. U.A. rules were strictly designed to test the students' innate Quirks. Support gear was generally banned for the Hero Course unless explicitly required for Quirk regulation.

 

But Izuku wasn't in the Hero Course.

 

Flashback to three days ago.

 

Izuku had stood in Principal Nezu’s massive, wood-paneled office. Power Loader and Eraserhead stood by the door, their expressions grim.

 

"You want to wear a fully mechanized, weaponized exoskeleton into a student tournament?" Eraserhead had asked, his tired eyes narrowing. "Midoriya, that's not just a support item. That's a mobile artillery platform. It's dangerous, and it gives you an unfair advantage."

 

Izuku had met the underground hero’s gaze without flinching.

 

"With all due respect, Mr. Aizawa," Izuku had replied smoothly, "what is a Quirk if not an unfair biological advantage? Todoroki can generate glacial ice and thermal firebeds without effort. Bakugo can detonate nitroglycerin from his sweat glands. Yaoyorozu can conjure cannons from her lipid cells. They were born with weapons."

 

Izuku gestured to his own chest. "I was born with nothing. If Hero Course students are permitted to use the biology they were birthed with to overcome obstacles, then as a Support Course student, I must be allowed to use the technology I birthed with my own mind. Banning my suit would be equivalent to binding Todoroki's arms and taping his mouth shut."

 

Principal Nezu had steepled his paws, a terrifying, delighted smile spreading across his snout.

 

"A brilliant, unassailable logical loophole," Nezu had chirped. "The Sports Festival is an exhibition of potential. It would be a disservice to the world to hide yours, Midoriya. The Mark III is approved."

 

End of flashback.

 

The warning klaxon blared through the staging area, signaling the students to gather in the entrance tunnel.

 

"Showtime," Izuku whispered.

 

He stood up, grabbing the handle of the massive titanium briefcase. It weighed exactly eighty-five pounds. To the Quirkless Izuku of ten months ago, carrying it would have been a grueling, exhausting task. But Izuku had spent nearly a year hauling scrap metal on Dagobah Beach. His physique beneath the P.E. uniform was lean, corded with dense, hard-earned muscle. He lifted the case with ease.

 

He walked out into the massive entrance tunnel, merging with the river of students from all the different courses—General Ed, Business, Support, and Hero.

 

As the crowd bottlenecked near the massive blast doors leading out to the stadium floor, Izuku found himself standing directly behind Class 1-A.

 

"Hey, get out of the way, extra," a familiar, venomous voice growled.

 

Izuku turned his head. Katsuki Bakugo was glaring at him, his red eyes burning with a mixture of irritation and sudden, jarring confusion. Bakugo looked Izuku up and down, taking in the confident posture, the lack of trembling, and the massive metal briefcase in his hand.

 

"Deku?" Bakugo sneered, the name tasting like acid on his tongue. "What the hell are you doing here? Did you get lost on the way to the bleachers? The General Ed and Support weaklings are supposed to be in the back."

 

Izuku didn't shrink. He didn't stutter. He looked at his childhood tormentor—the boy who had told him to take a swan dive off a roof—and felt absolutely nothing but clinical detachment.

 

"Hello, Kacchan," Izuku said, his voice terrifyingly calm. "I'm exactly where I'm supposed to be."

 

Before Bakugo could ignite his palms, the massive blast doors ground open.

 

The roar of the stadium hit them like a physical wall of force. One hundred thousand people screaming. Present Mic’s voice echoed like thunder. The blinding midday sun washed over the students as they marched out onto the grassy infield.

 

Midnight, the R-Rated Hero, stood on a raised platform, cracking her whip to silence the crowd. She explained the rules of the first event: The Obstacle Course. A grueling, four-kilometer race around the outer circumference of the stadium, filled with robotic enemies, treacherous terrain, and zero rules regarding combat between students.

 

"Take your places at the starting gate!" Midnight shouted.

 

The massive, incredibly narrow starting corridor was a tactical nightmare. Hundreds of students crammed into a space meant for fifty. Izuku stood near the back, the titanium briefcase resting by his feet. He could see Todoroki Shoto near the very front, his breath already misting in the air, his right foot positioned perfectly for a sweeping strike.

 

He's going to freeze the corridor the moment the buzzer sounds to eliminate the bottleneck, Izuku’s analytical mind calculated instantly. Standard area-denial tactic.

 

Above them, three massive green lights illuminated.

 

BEEP.

BEEP.

BEEEEEEEEEP!

 

"START!" Present Mic roared.

 

Chaos erupted. Just as Izuku predicted, a massive, terrifying wave of glacial ice exploded backward from Todoroki’s foot, instantly freezing the boots of nearly every student in the corridor. Screams of frustration echoed as hundreds of kids were glued to the floor, while Todoroki sprinted ahead into the clear.

 

Izuku didn't panic. He moved.

 

He tapped a hidden sequence onto the biometric lock of the briefcase.

 

"A.T.L.A.S., deploy Mark III," Izuku commanded.

 

The briefcase didn't just open; it rapidly, mechanically disassembled.

 

With a complex, high-pitched mechanical whine, the titanium plating shifted, expanded, and snapped outward. It was an astonishing marvel of micro-hydraulics and origami engineering. Izuku stepped directly onto the base plate.

 

In a fluid, five-second sequence that made the surrounding, ice-trapped students stare in absolute shock, the briefcase enveloped him.

 

The deep forest green and matte black plating of the Mark III snapped around his shins, locking with a hiss of pressurized air. The torso unit wrapped around his chest, the Emerald Core igniting with a blinding, pulsing green light that instantly melted the ice creeping toward his shoes. The arm gauntlets slid up his forearms, locking at the shoulders. Finally, the sleek, angular helmet slid over his head from the back of the collar, the eye lenses flashing a harsh, piercing white.

 

Inside the helmet, the HUD blazed to life.

 

"Armor fully deployed, sir," A.T.L.A.S.’s crisp, British voice echoed in his ears. "Power output at one hundred percent. All systems nominal."

 

Izuku was no longer a boy in a tracksuit. He was a mechanical titan.

 

"Let's catch up," Izuku's voice reverberated out of the external speakers, deep, synthesized, and utterly terrifying.

 

He didn't run. He bent his knees.

 

"Thrusters, twenty percent."

 

VHRROOOOM!

 

A massive pillar of pale blue fire erupted from the boots of the Mark III. The sheer thermal force instantly vaporized the remaining ice in the corridor, sending a shockwave of steam outward that knocked a dozen students off their feet.

 

Izuku launched into the air like a cruise missile.

 

He shot out of the corridor, flying twenty feet above the ground, his metallic body a blur of green and gold against the blue sky.

 

In the broadcast booth, Present Mic dropped his script.

 

"YEEEAAAHHH! WHAT IS THIS?! ERASERHEAD, YOU DIDN'T TELL ME YOU HAD A MECHA IN YOUR CLASS!"

 

Aizawa, sitting next to him covered in bandages, leaned forward, his single visible eye narrowing. "He's not in my class. He's Support Course. Class 1-H."

 

Izuku flew over the heads of the stragglers, effortlessly catching up to the vanguard. Up ahead, the ground began to shake.

 

The first obstacle: Robo Inferno.

 

Dozens of massive, multi-story zero-point robots from the Hero Course entrance exam blocked the canyon path. Todoroki had just frozen one in a precarious, off-balance position, threatening to crush the students behind him. Bakugo was launching himself into the air, using consecutive explosions to fly over the metallic behemoths.

 

"Sir, massive obstacles detected," A.T.L.A.S. warned, highlighting the weak points of the giant robots in red on Izuku’s HUD. "Suggest evasive maneuvers."

 

"Evasion wastes time, A.T.L.A.S.," Izuku said calmly. "We need to make a statement. Divert power to the chest unibeam. Ten percent output. Continuous beam."

 

"Diverting power."

 

Izuku leveled out his flight path, hovering mid-air right in front of the colossal head of a Zero-Pointer. The robot's massive red optical sensor locked onto him. TARGET ACQUIRED, the machine droned.

 

Izuku pushed his chest forward. The Emerald Core hummed, the sound pitching upward into a deafening scream.

 

A concentrated beam of pure, brilliant green kinetic energy shot from his chest.

 

The beam hit the robot’s central optical cluster. It didn't explode; the sheer, condensed thermal and kinetic pressure melted straight through the reinforced steel casing like a hot knife through butter. The beam pierced the robot's head, destroying its central processor, and blew clean out the back of its neck.

 

The colossal machine shuddered, its lights dying instantly, and it slumped forward.

 

"WHAT POWER!" Present Mic screamed, the stadium crowd gasping in unison. "SUPPORT COURSE STUDENT IZUKU MIDORIYA JUST ONE-SHOTTED A ZERO-POINTER WITH A CHEST LASER! IS THAT EVEN LEGAL?!"

 

Izuku didn't stop. He reignited his boot thrusters and flew directly through the massive hole he had just blasted in the robot's head, bursting out the other side and leaving the rest of Class 1-A staring in dumbfounded awe.

 

He blazed through the second obstacle—The Fall—by simply ignoring the tightropes and flying straight across the canyon.

 

The final obstacle was the Minefield.

 

Todoroki and Bakugo were currently battling for first place, carefully navigating the explosive pink landmines, their progress slowed by the treacherous terrain and their mutual hatred.

 

Suddenly, a shadow fell over them.

 

Bakugo looked up, his crimson eyes widening.

 

Flying fifty feet above the minefield, completely bypassing the hazard altogether, was the green and black armor.

 

"DEKU!" Bakugo roared, pure fury igniting in his veins. He pointed his palms downward, unleashing a massive, continuous explosion to launch himself like a rocket into the air, aiming directly for Izuku. "GET DOWN HERE AND FIGHT ME, YOU DAMN NERD!"

 

Inside the helmet, Izuku watched the proximity alert flash on his HUD. Bakugo was ascending rapidly, preparing to fire an armor-piercing AP Shot.

 

"A.T.L.A.S., deploy counter-measures. Chaff grenade, rear dispersal."

 

A small hatch opened on the back of the suit. A tiny, cylindrical canister dropped out and detonated mid-air, right in Bakugo’s face.

 

It wasn't an explosive. It was a massive cloud of microscopic, highly reflective metallic flakes. The cloud blinded Bakugo, clogging his vision and disrupting his balance. More importantly, the chaff temporarily absorbed the oxygen in the immediate airspace. Bakugo’s next explosion sputtered and died, leaving him with no propulsion.

 

With a scream of rage, Bakugo fell back down to the ground, triggering a massive chain reaction of pink landmines that buried him in pink smoke.

 

Izuku didn't even look back.

 

He touched down at the entrance of the stadium, his boots hitting the concrete with a heavy, metallic thud. He walked the final ten meters across the finish line as the crowd erupted into a deafening, unified scream of sheer disbelief.

 

"FIRST PLACE!" Present Mic bellowed. "THE IRON HORSE OF THE SUPPORT COURSE, IZUKU MIDORIYA!"

 

As Izuku stood at the finish line, the visor of his helmet slid up, revealing his sweat-slicked, freckled face. He looked up at the VIP box. He saw Pro Heroes pointing at him, whispering frantically to one another. He saw Endeavor glaring. He saw All Might, in his skinny form, gripping the railing, his mouth slightly open.

 

Izuku didn't smile. He just lowered the visor.

 

The message was sent.

 

 

 

The second event, the Cavalry Battle, was a masterclass in tactical AI utilization.

 

As the first-place winner, Izuku was assigned the ten-million-point headband. This made him the ultimate target. Everyone expected the Quirkless boy in the metal suit to be hunted down and slaughtered by the biologically superior Hero Course students.

 

They were wrong.

 

Izuku didn't team up with the strongest physical fighters. He looked at the variables. He looked at the Quirks.

 

He approached Mei Hatsume, who had easily qualified. "Mei. I need your hover-soles and your jetpack. Not for thrust, but for lateral stabilization."

 

"You got it, boss!" Mei grinned, strapping her gear on.

 

Then, Izuku approached Hitoshi Shinso, a tall, tired-looking boy from General Ed with gravity-defying purple hair.

 

"You're Shinso, right?" Izuku asked, his faceplate retracted. "Quirk: Brainwashing. Activates upon verbal response."

 

Shinso sneered defensively. "What's it to you, tin man? You going to tell me my quirk is meant for a villain?"

 

"I'm going to tell you it's the ultimate crowd-control weapon," Izuku replied flatly. "Join my team. You ride in the front. I will be the sole horse."

 

"You can't carry three people," Shinso scoffed.

 

"The Mark III’s micro-hydraulics can deadlift three tons," Izuku stated. "You won't even feel my arms shake. You agitate the attackers. They reply, you freeze them, Mei steals their headbands. I'll handle the evasion."

 

The formation was bizarre. Izuku stood alone at the base, carrying the weight of Shinso, Mei, and another Support Course student (who Izuku just needed as a placeholder for the rules) effortlessly on his armored shoulders.

 

When the battle began, the entirety of Class 1-A rushed them.

 

Inside the helmet, the HUD was a flurry of numbers, vectors, and probability algorithms.

 

"Incoming threat, bearing 2-7-0," A.T.L.A.S. warned. "Todoroki Shoto. Ice attack imminent."

 

Izuku didn't look. "Thrusters, lateral dodge, three meters right."

 

The suit sidestepped with terrifying, mechanical precision, dodging a massive spike of ice by mere inches.

 

"Hey, half-and-half," Shinso called out from above, his voice dripping with condescension. "Is that all the Number Two hero's kid can do?"

 

Todoroki glared. "Don't talk about my—"

 

His eyes glazed over. He froze mid-step, his team stumbling as their front rider went completely limp.

 

"Got him," Shinso smirked.

 

Denki Kaminari, riding on another team, charged his electricity. "I've got this! Indiscriminate Shock—1.3 Million Volts!"

 

A massive wave of yellow lightning exploded outward.

 

"Warning. High voltage incoming," A.T.L.A.S. stated calmly.

 

Izuku didn't move. He drove his metal boots hard into the dirt. "Ground the suit."

 

The lightning hit the Mark III with a blinding flash. To the crowd, it looked like Izuku had been fried. But Izuku had designed the armor as a perfect Faraday cage. The electricity traveled along the gold-titanium exterior, bypassing the insulated interior completely, and discharged harmlessly into the earth beneath his boots.

 

Izuku raised his gauntlet, the repulsor whining. He didn't aim at Kaminari. He aimed at the ground beneath Kaminari's team.

 

BOOM.

 

The kinetic shockwave flipped Kaminari's team entirely over, scattering them across the dirt.

 

For fifteen minutes, it was an untouchable dance. A.T.L.A.S. predicted trajectories based on microscopic muscle twitches of the attacking students. Izuku countered with non-lethal concussive blasts, flare blinding, and Shinso’s brainwashing.

 

When the buzzer sounded, Izuku still wore the ten-million-point headband, alongside a dozen others Mei had casually snatched from paralyzed opponents.

 

They were going to the finals.

 

 

 

The 1v1 Tournament was where the reality of the Iron Hero truly set in for the Pro Heroes watching.

 

In the first round, Izuku faced Tenya Iida. Iida’s speed was incredible, his Recipro Burst making him nearly invisible. But speed meant nothing if your trajectory was predictable. A.T.L.A.S. calculated Iida’s turning radius in three seconds. Izuku simply stepped backward, anticipated the kick, and fired a localized cryo-gel grenade (one of Mei's additions) directly onto Iida’s engine exhaust pipes. The sudden temperature drop stalled the biological engines, and Izuku gently pushed the frozen, immobile hero student out of bounds.

 

The crowd was slowly realizing they weren't watching a fluke. They were watching a tactical dismantling of biological superiority.

 

The bracket whittled down, brutal and fast.

 

Until the finals.

 

The sun was beginning to set, casting long, dramatic shadows across the ruined, scorched concrete of the fighting stage. The crowd was on its feet, a buzzing, electric energy thrumming through the air.

 

On the left side of the stage stood Katsuki Bakugo. His shirt was torn, sweat glistening on his arms, small, furious explosions popping from his palms like firecrackers. He looked like a cornered, rabid wolf.

 

On the right side of the stage stood Izuku Midoriya. The Mark III armor was fully sealed, the Emerald Core glowing softly in the twilight. He was a monolithic, expressionless knight of technology.

 

"THE FINAL MATCH OF THE U.A. SPORTS FESTIVAL!" Present Mic roared, his voice cracking with hype. "THE UNSTOPPABLE FORCE OF NATURE, KATSUKI BAKUGO, VERSUS THE INDESTRUCTIBLE MAN OF IRON, IZUKU MIDORIYA! THIS IS THE GRUDGE MATCH OF THE CENTURY!"

 

Midnight stood at the edge of the ring, raising her hand.

 

Bakugo stared at the metal suit. His pride was a bleeding, raw wound. He had spent his entire life looking down on Izuku, viewing him as a pebble on the side of the road. And now, that pebble had built a castle, locked himself inside, and was looking down on him.

 

"Step out of the suit, Deku," Bakugo hissed, his voice trembling with rage. "Fight me with your own two hands. Stop hiding behind your damn toys!"

 

The suit remained perfectly still.

 

"This isn't a toy, Kacchan," Izuku’s synthetic, modulated voice echoed across the stage. "This is my Quirk. I forged it in a fire hotter than anything you can generate. I didn't hide. I adapted."

 

"I'LL TEAR THAT JUNK TO PIECES!" Bakugo screamed.

 

"START!" Midnight slashed her hand down.

 

Bakugo didn't hold back. He launched himself forward with a massive, two-handed explosion, crossing the fifty-foot ring in a fraction of a second. He pulled his right arm back, the muscles bulging, sweat igniting into a concentrated, lethal AP Shot aimed directly at Izuku’s helmet.

 

"Incoming. Velocity Mach 1.2. Threat level: Critical," A.T.L.A.S. warned.

 

"Don't block," Izuku commanded. "Parry."

 

The micro-servos whined. Izuku didn't flinch. As Bakugo’s fiery fist swung forward, Izuku brought his left gauntlet up, catching Bakugo’s forearm just behind the wrist. The sheer kinetic impact of Bakugo’s speed against the metal suit created a shockwave that cracked the concrete beneath them.

 

The AP shot fired, but because Izuku had deflected the arm upward, the concentrated blast of fire shot into the sky, safely missing the armor.

 

Bakugo’s eyes widened in shock. The metal grip on his arm was like a vice.

 

"Torque output to forty percent," Izuku muttered.

 

Izuku twisted his hips and threw a brutal, hydraulic-powered right hook directly into Bakugo’s ribs.

 

The sound of metal striking flesh echoed through the stadium. Bakugo spit blood, the breath knocked entirely out of his lungs, and he was launched backward, tumbling across the concrete like a ragdoll.

 

The crowd went dead silent. Bakugo had dominated every physical fight thus far. He had just been swatted away like a fly.

 

Bakugo dug his fingers into the concrete, halting his momentum near the edge of the ring. He coughed, holding his side. He looked up, his eyes entirely bloodshot, pupil-less with rage.

 

"YOU BASTARD!"

 

Bakugo changed tactics. If he couldn't beat the armor in close combat, he would melt it. He began to spin, launching himself into a chaotic, wildly unpredictable aerial assault. He bounced off the invisible walls of his own explosions, zig-zagging through the air, laying down a carpet bombing of massive, concussive blasts.

 

The stage vanished in a sea of blinding orange fire and thick black smoke.

 

Inside the suit, the temperature gauge began to rise.

 

"External armor temperature approaching 800 degrees Celsius," A.T.L.A.S. warned. "Thermal regulation systems engaging. Sir, his movements are becoming erratic. Predictive algorithms are dropping below sixty percent accuracy."

 

Bakugo was a combat genius. He had realized the machine was predicting his standard attack patterns, so he abandoned pattern entirely. He was fighting on pure, unadulterated instinct.

 

A massive explosion slammed into Izuku's back, pitching him forward. Before he could recover, another blast hit his left side, scorching the green paint.

 

"Stun Grenade!" Bakugo roared from the smoke, unleashing a blinding flash of light.

 

"Polarize lenses! Audio dampeners to maximum!" Izuku yelled.

 

The helmet’s lenses instantly turned pitch black, saving Izuku from being blinded, and the internal noise-canceling completely neutralized the deafening BANG.

 

"I see you," Izuku whispered. "Switching to thermal imaging."

 

The HUD shifted to a red-and-blue thermal landscape. Through the thick smoke, Bakugo’s body glowed like a miniature sun, his sweat glands radiating immense heat.

 

"Target locked. Micro-missiles, non-lethal kinetic payload."

 

Small hatches opened on Izuku's shoulders. Four tiny, pencil-sized projectiles shot out, tracking the thermal signature.

 

They hit Bakugo mid-air. They didn't explode with fire; they exploded with concentrated concussive force, acting like mid-air battering rams. Bakugo cried out in pain as the blasts threw him off balance, sending him crashing onto the stage.

 

Izuku burst through the smoke, his repulsors whining. He landed heavily, aiming both palms at the downed Bakugo.

 

"Stay down, Kacchan," Izuku warned. "You have a cracked rib and minor concussive trauma. Your sweat glands are inflamed. If you keep pushing your output, you'll tear your own muscle fibers."

 

Bakugo slowly got to his feet. His arms were shaking. He was bleeding from his forehead. But his grin was terrifying. It was the grin of a demon who had just found a worthy opponent.

 

"Shut up... you damn nerd," Bakugo panted, his chest heaving. "You think... you think you can calculate me? You think your little computer can measure my drive?"

 

Bakugo raised his right hand. He grabbed the pin of his massive, grenade-shaped gauntlet. He had been saving it. He was soaked in sweat.

 

"Let's see your math block this!" Bakugo screamed.

 

He pulled the pin.

 

The explosion was apocalyptic. A massive, roaring pillar of fire engulfed the entire right side of the stadium. The sheer concussive force ripped the concrete stage out of the ground, sending massive boulders flying toward the audience (thankfully caught by Cementoss’s emergency barriers).

 

Inside the Mark III, alarms screamed.

 

"Warning! Catastrophic kinetic impact detected!" A.T.L.A.S. yelled over the roar of the flames.

 

Izuku planted his feet, diverting all power to the frontal deflector shields. The heat was unbearable. The HUD flickered violently as the electromagnetic shockwave messed with the suit's sensors. The left arm servo locked up with a screech of warping metal.

 

When the fire cleared, Izuku was still standing, but the suit was heavily damaged. The sleek green paint was charred black. The left arm hung uselessly at his side, hydraulic fluid leaking onto the ruined stage.

 

Bakugo was panting heavily, looking completely drained. But when he saw the armor still standing, his rage reignited.

 

"NOT DEAD YET?!" Bakugo roared. He ignited his palms, launching himself high into the sky, spinning like a top. He was generating a massive oxygen vortex, drawing all the air in the stadium toward him.

 

He was preparing his ultimate move. The Howitzer Impact.

 

"A.T.L.A.S., status," Izuku coughed, the air inside the helmet growing thin.

 

"Left arm servo destroyed. Flight stabilizers compromised. Emerald Core output at forty percent and dropping rapidly due to shield strain," the AI reported. "Opponent is generating an explosive yield that exceeds the armor's maximum structural tolerance. A direct hit will result in catastrophic failure. Recommendation: Evade immediately."

 

Izuku looked up at the spinning tornado of fire descending toward him.

 

If he ran, he lost. If he stepped out of bounds, he proved that technology had a limit. He proved that biology still reigned supreme.

 

"No," Izuku said, his voice dropping to a harsh, resolved whisper. "We don't run. A.T.L.A.S. Divert all remaining power from life support, flight stabilizers, and micro-servos. Reroute everything to the chest Unibeam."

 

"Sir, draining the core to zero percent will cause complete system shutdown. The suit will become a multi-ton coffin. You will be defenseless against the secondary shockwave."

 

"Do it."

 

"...Rerouting power. It has been an honor, Midoriya."

 

The suit locked up entirely. Izuku couldn't move his legs. He was rooted to the spot. But the Emerald Core in his chest flared to life, burning brighter than the sun. It shifted from a soft green to a blinding, furious white.

 

"HOWITZER... IMPACT!" Bakugo screamed, descending like a meteor, unleashing the largest explosion of his life.

 

"UNIBEAM!" Izuku roared.

 

The beam of pure palladium energy shot upward, colliding with the descending hurricane of nitroglycerin fire in the exact center of the arena.

 

The clash defied description. The sky turned split-color—half blinding green light, half raging orange fire. The sound was a continuous, deafening screech of tearing reality. The wind pressure blasted the Pro Heroes back into their seats. The cameras stationed around the stadium shattered from the sonic boom.

 

For ten agonizing seconds, the two forces battled for supremacy. The green laser pierced the fire, trying to reach Bakugo, while the fire pushed down, trying to melt the armor.

 

Inside the suit, Izuku screamed as the heat overwhelmed the internal dampeners.

 

Then, the HUD flickered.

 

"Power reserves at 5%... 2%... 0%."

 

The Emerald Core died. The Unibeam cut off abruptly.

 

Without the opposing force, the remainder of Bakugo’s Howitzer Impact slammed directly into the Mark III.

 

The explosion engulfed Izuku entirely.

 

The stadium shook violently, a massive mushroom cloud of black smoke rising into the twilight sky.

 

Silence descended upon the U.A. Sports Festival. It was a heavy, suffocating silence. Nobody breathed. Present Mic didn't speak.

 

Slowly, the wind carried the thick smoke away from the ruined crater that used to be the stage.

 

Katsuki Bakugo stood on the edge of the crater. His shirt was completely gone, his arms hung limply at his sides, smoking and severely bruised. He was hyperventilating, his eyes wide, staring down into the pit.

 

At the bottom of the crater lay the Mark III.

 

It was completely destroyed. The chest plate was caved in. The helmet was half-blown off, revealing Izuku’s bruised, bleeding face beneath the shattered visor. The suit was utterly lifeless, pinned beneath its own massive weight.

 

Izuku’s eyes fluttered shut. He was unconscious.

 

Midnight stood at the edge of the crater, looking at the broken metal and the sleeping boy inside it. She raised her whip.

 

"Izuku Midoriya is incapacitated!" she announced, her voice echoing in the dead silent stadium. "The winner of the U.A. Sports Festival is Katsuki Bakugo!"

 

There was no immediate cheer. There were no fireworks.

 

Bakugo stood there, looking down at his own hands. They were trembling violently. He had won. He got exactly what he wanted. He had beaten Deku. He was the champion.

 

But as he looked at the ruined suit of armor, Bakugo felt a sickening, hollow feeling in his gut. Because he knew the truth. Deku hadn't lost because he was weaker. Deku lost because the battery ran out.

 

Suddenly, a single, slow clap echoed from the VIP booth.

 

Everyone looked up.

 

It was Pro Hero Snipe. He was standing up, clapping his hands together. Slowly, next to him, Ectoplasm stood up and joined in. Then Power Loader. Then Kamui Woods. Then, shockingly, Endeavor.

 

The applause cascaded down from the Pro Heroes to the general audience. It grew, swelling into a thunderous, standing ovation. The stadium erupted, cheering louder than they had for the entire festival.

 

But as Bakugo looked around, his red eyes wide with horrifying realization, he saw where the crowd was looking.

 

They weren't looking at him.

 

They were looking down into the crater. They were looking at the Quirkless boy who had just taken a monster to the absolute limit using a box of scraps and a brilliant mind.

 

High above, in a private booth, Toshinori Yagi clutched his chest, a single tear tracking down his sunken cheek. He looked at the shattered green armor, remembering his own cruel words on a rooftop nearly a year ago.

 

Make sure they're realistic.

 

"You didn't just become realistic, young Midoriya," All Might whispered to the roaring stadium. "You changed reality itself."

 

The medical bots rushed the field to cut Izuku out of his metal coffin. The Iron Hero had lost the tournament.

 

But he had just won the entire world.