Y/N Mercer (Prototype Male Reader x My Hero Academia)

Y/N Mercer, son of Alex Mercer was only a child when his parents died. He had survived on the streets on his own. But unfortunately, thanks to his powerful abilities, he's targeted by the League Of Villains, and even the Yakuza, or more specifically their leader, Overhaul. He was always on the run, never sure of who to trust, doing whatever he needed to do just to survive. Up to, and including killing several villains that were sent after him. Hell, the kid even managed to kill All For One, and steal his quirk. Although, nobody really knows how he died, aside from the League Of Villains of course.
(You killed him before he fought All Might) What happens when he is put under the protection of UA? Will he be able to trust them? Will he be able to become a hero like the rest of his new classmates? Or will his past continue to haunt him? Only time will tell.