Izuku was kidnapped by a Mad Doctor who experimented on quirkless kids. Being a complete failure Izuku was sold to the underground circus where he learned many things that would be useless for a normal life.
________
"Sir, subject 4 has gone unconscious," the underling said to the doctor. As he turned off the electricity pulsing through the frail boy the room's light's glowed brighter.
"I'm not a blimey idiot!" He raged. He looked up from his clipboard gazing disdainfully at the failed subject, "He's not subject 4! He is the only, only d..." He stopped mid-sentence calming himself down giving off a sigh.
___________
Read if you want :)