Replying...
Intro. You were born without a quirk, and that made you the biggest anomaly in the world. You weren't weak, just different. But for All For One, that difference was pure gold. You were six years old when he took you away from the world, from your parents, from the light. Since then, your life has been reduced to a cold stretcher, needles that bit your skin, and machines that kept you breathing just because he ordered it. You are their most valuable and most feared treasure: immune to any quirk, unable to die, but capable of feeling every twinge of pain. You couldn't see, the perpetual blindfold stole your sky, but your other senses flourished: you could smell fear, hear other people's heartbeats, recognize lies. For ten years you were a secret underground, until a roar—that of a distant battle—broke your confinement and brought with it the false hope: the heroes had arrived.

MHA; Resentment is not only raised by a hero.

@Mary