Summary: Izuku is born with a quirk. One far too powerful for him to control. Join Izuku on his journey to control one of the most powerful quirks ever seen, and his journey to turn that uncontrollable power into the might of a hero. Hulk Izuku!(Kinda, you'll see) IzukuxToga!(Will develop a bit slower than they sometimes do.)Other smaller characters with bigger roles! Will be slow to update
Rating: T
Word Count: 57,516
Status: Ongoing
Link: https://www.fanfiction.net/s/13375686/1/Izuku-SMASH
Chapter 1: Chapter 1
"Your son will never get a quirk"
The words rang through the ears of young Izuku Midoriya even as his mother drove him home from the quirk clinic. His mother drove in silence while Izuku stared down at his feet, or more specifically, his toes.
Two joints, one in each little toe, was all the doctor needed to look at before writing him off as a lost cause, part of the 10% of society that was powerless, quirkless.
As they pulled into the parking structure of their building, Izuku tried hard not to think about all the things he would miss out on by being quirkless. He wouldn't get to show off cool powers in class like Kacchan did, he wouldn't be able to punch through buildings like All Might, he couldn't even have his father study his quirk like he did for so many others as a quirk doctor in America.
But… maybe… just maybe… he could still be a hero.
As he rewatched his favorite video of All Might saving people from a building, smiling the whole way, he couldn't help but think that even if he was quirkless, that… THAT was what he was going to do with his life, save people with a smile.
And so, even as his mother told him that she was sorry, leaving unspoken her lack of faith in his dreams, Izuku remained firm. He was going to be a hero, like All Might. And he wasn't going to let being quirkless stop him.
That belief however, didn't sit well with others, his best friend Bakugo Katsuki most of all. It was him that gave him the nickname Deku. Useless.
He was also the one currently staring down Izuku as he stood over the boy that Bakugo and his two cronies had been bullying before.
"I-i won't let you hurt him anymore Kacchan, tha-that's not what heroes do." Izuku protested, his wide green grey eyes frantically watching the small explosions crackle in his 'best friend's' hands.
"Useless little Deku, you're even more worthless than the extra behind you. You'll never be a hero without a quirk, that's just not how the world works. I'll even prove it to you Deku." Katsuki said in a childish drawl, his wide smirk matched by his two companions.
Izuku knew he was about to get beat up, he just couldn't match Katsuki and his two followers, even if he had a quirk, 3 v 1 wasn't exactly fair.
"Hey extra, if you help us beat up Deku we won't bother you anymore, how's that for a deal?" Bakugo asked the downed boy he had been beating previously.
Izuku froze in a cold sweat, surely the boy wouldn't, he was trying to help, and Bakugo was…
That thought process quickly died as he felt a small foot connect with the back of his knee, causing him to fall on the ground in front of Kacchan.
"See Deku, even the people you try to help are better than you, you're just a useless nothing. Get with the program Deku, you're never going to be a hero." Katsuki bragged before sending a strong kick into Izuku's side as he made to stand up.
Izuku let out a yelp of pain as he felt the four boys continue to kick him, could hear Katsuki's hands crackling with small explosions fuelled by his excitement. And all he could think was why.
Why was he born quirkless, why Kacchan had to be so mean, why the boy had helped Kacchan when he was just bullying him instead of Izuku.
Why why why why why why.
The word ran constantly through Izuku's head as he felt every kick connect before finally stopping on one final question.
Why was the world so unfair.
And for the first time in his short life, Izuku got angry.
It wasn't fair, it wasn't right, and there was nothing he could do about it except scream his protests.
It was bubbling in his stomach, slowly expanding outwards to his skin. The rage he was feeling was all encompassing. It made him stronger.
He couldn't even feel the kicks anymore, all he could feel was the rage building within him, filling him until it burst outwards in a mighty roar.
And just like that, Izuku knew nothing more.
Across the city
Shota Aizawa was not a happy man.
Not only had he been pulled for an extra day shift on top of his usual night shift, he was also forced to partner with Hizashi, also known by his hero name of Present Mic. A good friend, but not a person he would choose to deal with when he was running on less than 2 hours of sleep and the beginning of a bad case of dry eye. All he wanted to do was go to bed, but here he was, parked on a cafe rooftop.
"Ya hear that Shota, sounds like they need back up at the park, let's roll." Mic said before turning and jumping across the rooftops towards the park at the heart of the city.
Honestly, why Mic got so excited over what was probably a minor villain trying to kidnap some kid, Shota wasn't sure, but as he followed, he couldn't help but feel this was going to be something a bit bigger.
The sounds of sirens going the same direction as himself proved him to be correct.
When he arrived at the scene, Aizawa was shocked to see several small time heroes already laid out across the park, Ingenium rushing about bringing them out of the combat zone to safety. Mic was near the ambulances, sending his sonic blasts towards Death Arms and the slightly smaller figuring that was currently beating him across the park.
The villain was smaller than Aizawa would have expected, but that didn't mean anything to their apparent strength. Some of the heroes he saw broken across the ground were known for their strength if nothing else, and it was clear the only reason Death Arms was lasting this long was because his opponent fought like a berserker rather than with any skill.
On top of being just shorter than the average adult, the villain had grey skin, tinged with a faint green, and a wild mane of black hair, also with a faint green tint when the light hit it. It was also built like a mini All Might, that is to say, all muscles, built on top of even more muscle, that still seemed stronger than it looked.
"Eraserhead, can you shut it down?" Mic called over, taking a break from distracting the grey berserker as it again tried to break through Death Arm's guard.
A hard stare later and Aizawa knew he was going to be useless this fight, as the berserker didn't even show a single sign of slowing down or transforming into a person. All the weariness he felt drained away, replaced by determination and a small amount of fear. This was going to be much harder than he first thought.
"Nothing, I don't think we can take it down as is, we need to stall for someone stronger to get here to put it down." Aizawa shouted back before preparing himself to go in. While he couldn't stop the beast, he could most certainly slow it down until someone with more raw power arrived to finish the job.
"Roger." Mic shouted, the usual cheer gone from his voice as he again blasted the grey skinned berserker, who barely seemed to notice the sonic attack beyond giving a roar and smashing even harder at Death Arms.
Aizawa quickly leapt in and sent a kick at the side of the berserker's face from behind, and was utterly shocked when it barely flinched, only sending a wild swat backwards and knocking Aizawa into the wall of a building roughly.
Careless, no wonder only Death Arms was able to hold this thing off, he was the only one capable of getting enough force in one spot for the thing to even feel his attacks.
As Aizawa sat up, he saw a shadow descending from overhead even as the berserker finally landed a solid punch into Death Arms' stomach, sending him flying across the park and through a wall, where he was slow to get up.
Before the berserker could pursue his fallen foe, Ingenium sped his way with an assault of speed empowered blows, only to have both his punches caught and his arms broken in a painful grip before being casually tossed aside by the relentless berserker.
Fortunately, he was caught by Ryukyuu in her dragon form as the number 9 ranked hero descended onto the field, blocking off the berserker from reaching the slowly rising Death Arms.
"Eraser, help Death Arms, I should be able to finish this guy off." Ryukyuu called to Aizawa, who could only nod and acknowledge how outmatched he was in this fight. With the promotional fight between All Might and Endeavor happening in a weeks time, at the number two hero's insistence, a great majority of the more powerful heroes were two cities over, and unable to come match the berserker in a timely manner, only Ryukyuu's flight had let her arrive soon enough to make a difference. No matter how small that might be.
Already the park was in ruins, and Aizawa could see the injured forms of multiple children being loaded into an ambulance and being driven away from the scene. Whoever this guy was, he was going down.
"You see what started this?" Aizawa asked Death Arms as he helped him get away from the Ryukyuu and the berserker squaring off.
"I was here since the start, whatever that thing is, it came from inside the park, tearing everything apart and going after some kids. I was the one that gave them enough time to get away, but one had severely broken fingers and another two had broken legs. The blonde was worst off, ribs, a leg and both his arms were a mess in a matter of seconds. Lucky Ingenium was near enough to get them all away while I fought that thing, because even now, it's going after them.
And even as Aizawa turned to face the fight between the top ten hero and the smaller berserker, he could see Death Arms was telling the truth, even as it picked up a fallen tree and tried to club Ryukyuu with it, it also chucked it in the direction the ambulance with the boys he had seen leave in.
"It's intelligent, maybe not human level, but enough to pick certain targets." Aizawa realized, the pain mixed with growing concern for the ongoing fight driving away any lingering exhaustion he might have been feeling.
"Yeah, let's just hope Ryukyuu can take this thing down, otherwise that thing's gonna tear through the city to get after those kids." Death Arms agreed, gingerly holding his undoubtedly broken ribs as Aizawa led him to a waiting medic. "Get back out there Eraser, they're gonna need all the help they can get." Death Arms said, before finally passing out.
Only now could Aizawa see just how bad of shape the man was really in. His titanium arm guards were heavily cracked and almost shattered in places. One of his arms was undoubtedly broken and both his shoulder looked like they were popped from their sockets. All that and he kept going until a lucky punch had done in most of his ribs and damn near caved in his chest cavity. Truly a Plus Ultra performance from the punching hero.
Steeling his resolve, Aizawa jumped back out to the front lines as Ryukyuu and the berserker continued their fight.
While his strength was certainly impressive, it seemed that the smaller berserker couldn't move Ryukyuu, not could his blows truly hurt her through her diamond hard scales. But on the flip side, he was agile enough to dodge away from his larger opponent's slower blows. It was a stalemate, but Aizawa couldn't see that lasting long. Ryukyuu had more cards left to play than the berserker, and all it would take was one good hit to put him down.
That hit came as the berserker ducked under a claw swipe from the dragon hero, who quickly continued her momentum and smacked the berserker with her tail in a mighty swing, causing a small explosion of force and a dust cloud to rise.
Aizawa waited patiently for the dust to clear, to see if the berserker was truly put down by the strong blow from Ryukyuu's tail, but what he saw was not something, he, nor anyone else, was expecting.
Instead of being crushed under Ryukyuu's tail, the berserker had caught the dragon's rear most appendage and was slowly pulling on it, even as Ryukyuu tried to pull her tail out of the berserker's grasp.
" SKAAR SMASH!"
With a mighty roar of fury, the muscular grey skinned berserker heaved and threw Ryukyuu's entire body and smashed the heroine into the ground, drawing a cry of pain from her draconic maw.
Before he could jump into the fight to stall for Ryukyuu to recover, Aizawa saw a familiar pink mist forming around the berserker. It took a few seconds, but eventually it had inhaled enough and it collapsed in a heap, put to sleep by Midnight's quirk.
Once the mist had dispersed, Aizawa was one of the first to approach the sleeping berserker, Skaar it had called itself, ready to react in case it lashed out again.
But it was well and truly asleep, and seemed to be shrinking as well. To Aizawa and many others shock, it shrunk until the once powerful berserker was reduced to the form of a small sleeping child no older than four.
Aizawa watched as handcuffs were put on him and he was carried to a cop car, following in case he awoke and transformed again, but he doubted he would be necessary. The kid had a powerful quirk, and it was probably his first time using it, which was why he lost control.
But standard procedure was to arrest the perp, which was something he had argued against. Showing the kid that cops were the bad guy was not something that would go well in the long run, and he never wanted to be on the receiving end of the boy's berserker form.
But Aizawa only watched as the boy was unloaded and taken into the police precinct. He wished the boy well, but he would never forget that underneath the innocent freckles and wavy hair hid a raging monster just waiting to be set free.
The boy had potential if he could get himself under control while he transformed, and Aizawa was interested to see if he could live up to it. Maybe he would take that teaching job he had been offered after all. Of course, the fact that he could sleep through class just like he had when he was in school himself was another benefit.
Aizawa yawned and began the long journey to his awaiting bed back home. Potential indeed.
In the precinct
Toshinori Yagi had come as soon as he saw the news. While he hadn't been fast enough to stop the grey skinned berserker that called itself Skaar himself, he was there fast enough to claim guard duty over the sleeping child that held the beast within.
And upon seeing the boy, any doubts he had previously had were erased, the quirk could have been a coincidence, but the boy's face was almost identical to his father's. Match that with an almost identical quirk, and All Might knew exactly who he was dealing with.
It had been years since he had been to America and last spoken to the man in person, but when he had, Bruce had been certain that he had gotten rid of his own quirk, completely erased it form his DNA. And yet, here was living proof that the Hulk, the only opponent to ever overpower him, wasn't as dead as the world thought it was.
Toshinori knew he had to watch over the boy, while he was confident in his ability to avenge his late master, if All for One got his hands on this quirk, the result would be disastrous. Not to mention he owed it to his old friend for helping him completely master One for All.
So for now he would wait, and he would vouch for the boy when he woke up. His father had been feared and chained because of his powerful and out of control quirk, but All Might would see the boy in front of him become whatever he wanted to.
After all, it was a hero's duty to meddle when they weren't wanted if it meant helping someone else.