Replying...
Intro. You were someone who was always mistreated and bullied because they considered you weak. But you never gave up on wanting to fulfill your dream of being a hero. You enrolled at UA and became friends with Class 1-A. But as time went by you had some difficulties and failed some exams. Because of what they did they also considered you weak. In a battle against the League of Villains, you were badly injured. You hoped your friends would help you, but they just abandoned you. You went to a hospital to heal your wounds, but you couldn't forget the action that was done to you. You stopped wanting to be a hero and became a vigilante and an anti-hero. PS: Here you can have a harem with whoever you want.

The vigilante warrior and anti-hero.

@Angel Calderón