MHA: The omni hero: Legion

Izuku dug through the trash, loading the scrap metal into All Might's car trailer. He picked up a microwave and was about to throw it on there, when he saw something in the microwave, a green and black watch. It seemed to be in pristine condition. It looked exactly like the watch worn by a long dead hero from the emergence of quirks. He had learned about him in school. He was known as legion, the hero of a hundred forms. He could transform into an uncountable number of monsters, which he insisted were aliens. In fact, Izuku was descendant of this hero, he was his great, great -and so on- grandfather. It was ironic, that the descendant of one of the heroes with the most powers had none at all, as kacchan was quick to point out.

"Why would someone throw a perfectly good watch away… is it broken? This is a valuable collectible", he opened the appliance and took out the watch, placing it on his arm and, to his surprise, the watch latched onto his arm as if it were alive. It whizzed and glowed green. He tried to remove it from his wrist but it didn't budge. A hologram of a boy, maybe 16 years old, appeared above the clock face(which had no actual numbers on it, just an hourglass design) and began speaking, "Finally! It has been pretty boring, waiting for my blood to find the watch… anyways, congratulations, you have inherited my powers"

"What- huh? Who- are you?"

"Why I'm Ben Midoriya, or rather an AI left behind in his form. From the sensors in the watch, I can tell it has been 300 years since I have been deactivated, so you must be my grandson, give or take a few 'greats'? Well, congratulations! You have inherited the omnitrix! This device is what gave me my powers. That's right, the great Legion's powers were not a meta ability but the work of an alien device. It was a curious happenstance that it came to me right when meta abilities began emerging", the hologram said, "now that you have the omnitrix, you too have the power to transform into aliens, though -as to not overwhelm you- you are restricted to ten aliens, which Ben -the real Ben- has picked out"

"What are you doing there, young Midoriya, I thought you were- what is that?" All Might asked.

Izuku explained the situation and All Might stood there, dumbfounded, "an alien device? It has chosen you? Say, why don't you try and transform, then we'll know if this hologram is telling the truth"

"Sure, how do I do that?", he asked the hologram.

"Just press this button, there will come a holographic display, select whatever alien you want to transform into and lightly press down on the face. Don't do it with too much force, else the transformation might be off. You can stay in an alien form for up to an hour, before the watch times out and has to recharge for 15 minutes", Ben explained.

Izuku did as he was told and pressed the button, cycling through the 10 different silhouettes, with names above them, 'Heatblast, Diamondhead, XLR8, Grey matter, Four arms, Ripjaws, Upgrade, Big chill, Ditto, Wildvine'

He chose the silhouette which looked the most buff, Four arms, and pressed down on the device. There was a green flash and suddenly, he wasn't Izuku anymore, at least he didn't look like him anymore, he was 12 feet tall, with red skin, two pairs of eyes and two pairs of arms with four fingers each. He was muscular, shirtless and wore a speedo. Golden cuffs were on his forearms and the hourglass design was on the middle of his chest.

"Wow- Wait, why is my voice so deep?", his voice was totally different from before, deep and powerful, like All Might's voice in his muscle form. He picked up a fridge nearby and crushed it with relative ease, "Woah, this is awesome"

The hologram of Ben appeared in his vision, though All Might couldn't see it, "I scanned your brain and let me tell you now, you won't be able to inherit one for all"

"I won't be able to?"

"What are you talking about, young midoriya?"

"Ben said I won't be able to inherit one for all", he said, pressing his symbol and transforming back, now, the hologram was still in his vision but transferred shortly after to the watch, "The omnitrix has a failsafe against something changing his genetic makeup. That is why only people without meta abilities -or quirks as I have learned from scanning Izuku's brain, they are now called- can use them, or rather, if someone with a quirk used it, it would erase the quirk. Of course, only my family can use the omnitrix, because it is locked into my dna"

"I guess you will have to find a different successor", Izuku smiled sadly, before lighting up again, "but this means I can finally become a hero. With the powers of Legion, I can make it to the top!"

"Guess this is where our paths stray then… I wanted it to be a surprise, but I guess I'll tell you now. I have accepted a teaching position at UA, so we'll see each other there, once you get in. I look forward to meeting again", All Might smiled, walking to his car and driving off.

Later that day, he approached his mother, telling her that he had been training, as usual, when he felt a sharp pain in his wrist and the omnitrix just appeared. He couldn't very well tell her the truth, so he told this lie. It wasn't unbelievable, these things happened from time to time and objects appearing with the awakening of a quirk wasn't new either, it happened, if rarely. They registered his quirk as 'Omnitrix', the same name as his ancestor's quirk had been called.

The next day, the teacher announced that Izuku finally had a quirk and Kacchan was freaking the fuck out, "You dumb, useless deku! You have been hiding this from me, haven't you?! You were looking down on me weren't you?!"

"N- no kacchan! I- I awakened my quirk only y- yesterday… you see? The watch wasn't there b- b- before, a- and now it is there. I- I couldn't have hid that from you e- even if I wanted, w- which I didn't!", he threw up his arms, prepared for an explosion launched against him but nothing came. He opened his eyes and saw Kacchan simply sitting back down. His logic seemed to have come through to him. He still looked annoyed though.

Izuku spent the next three months cleaning up the beach with the help of the omnitrix, getting used to everyone's moveset. After three months, the beach was clean, so he spent the rest of his time, three more months, to grow physically stronger, so as to not be totally useless when he timed out. He also learned how to switch between aliens mid-battle, a tactical advantage good to have. Before he knew it, the time was up and the UA entrance exam was upon them. He stood before the UA gates and gazed up to the big, glass building which stood tall and proud. Taking a step forward, he tripped and fell, 'of course the first thing I did was gonna be eating dirt', he closed his eyes but he never met the ground. Opening his eyes, he found himself floating. A nice looking girl, with brown bangs smiled at him, "I'm so sorry for using my quirk on you but I figured you wouldn't want to start your journey by faceplanting"

She tapped her fingers together, "release" and gravity returned to him.

"T- thanks", Izuku said.

"No problem!"

They walked into one of the exam halls and sat down.

"Am I a mouse, a bear, a monkey? Who knows, all that I am is the principal of UA! Nezu is the name, also known as mr. Principal. You have three parts of the exam, each part is an hour long and you have 30 minutes in between the exams to collect yourself. Quirk use is allowed, as long as you don't copy off someone else. You may not use any electronics unless it is with your quirk. The first exam is general knowledge, you may begin!"

Izuku tapped the omnitrix and selected grey matter. He was now a grey, frog like humanoid who was only six inches tall. The omnitrix symbol was on his back. He grabbed the piece of paper and wrote with incredible speed. The information he needed just flooded into his mind as if he had just read a whole essay on each subject. Even with this enhanced intelligence, he only finished five minutes ahead of the deadline. The exam was more than likely not meant to be finished.

Izuku de-transformed and handed the papers over to principal Nezu. The rodent seemed surprised and read through the papers as Izuku walked back to his desk, patiently waiting for the time to run out. There was a glint of… something behind the principal's eyes, he could see, though he couldn't identify what. Once the time ran out, Nezu and a few other pro heroes walked around, collecting the papers and they were escorted to the outside. People were chatting, some were on their own, meditating to clear their minds and some walked up to him.

"You handed your paper in early… were you that lost?"

"Yeah, I mean, I was pretty stumped too but not so dumbfounded that I would throw the exam"

"Actually, I f- f- finished it", Izuku stammered.

"You what?!"

"I only got half way through"

"Must have some kind of intelligence quirk"

The examinees left him alone after that. Half an hour later, they were led back into the exam hall, "this exam tests your knowledge on hero law, you have- once again- an hour to complete it. Begin!"

Once again, Izuku transformed and got to work. This time, he got to the last question, a particularly hard one, about a fringe law passed 29 years ago. He didn't get to finish it before the time was up, detransforming mid-sentence and having his answer half finished when the teachers took the papers from him.

After their break, it was time for the last and the hardest exam. This one was about morality. He managed to finish this one, if barely and was pretty satisfied with his answers, especially the last one, about prioritizing in a disaster zone. Grey matter was a godsend.

Izuku had an hour to waste before the practical exam, so, he walked towards the cafeteria, where he ordered a bowl of ramen from Lunch Rush. It was divine. Lunch Rush provided food to people in need in disaster situations. He could fight villains too but it wasn't his strong suit. He was a rescue hero, not a combat oriented one. He chatted with some of the other examinees about their families.

"Yeah, my older brother is a Pro, you might've heard about him, Kamui Woods?", said one kid, who was made out of plant vines, "He was my inspiration for applying, what about you, you've been rather quiet?"

He asked Izuku.

"A- ah- y- yes, I- well, I am descended from- from a h- hero…"

"Really, which one?"

"L- legion", he croaked out.

"Legion? Now that you mention it, you have a watch on similar to his… is your quirk as awesome as his?" asked Kamui Woods' brother.

"W- well, I c- can transform into ten different aliens, though I think with training, I might be able to do more. According to the sources, Legion started with ten transformations too but he got more as he got older it is really fascinating", he went on a long tirade about legion, not even noticing that he stopped stuttering. He was gaining more confidence by the second.