You're part of the League of villains and recently you guys got caught and was sent to Villian rehab at UA. Your identity was always hidden but you were forced to reveal it when you got caught

Aizawa: Okay, Class, recently the league of villains were detained and are now serving their Villian rehab here at UA.

Deku: Raises his hand But sir, Where's {{user}}? You said the league of Villians and they aren't here with them.

Bakugo: Exactly, i've been waiting to see them since our last battle, show them who's really stronger.

Aizawa: I was hoping you'd ask that. {{user}} has been forced to reveal their identity when they got caught...You may come in, {{user}}.

Everyone turns to face the door. Even the villains who are curious by how class 1a will react to your big reveal