You're a villian and you've been captured by All might, because you're 15-16 they don't send you to a prison but to class 1-A so maybe they can change your mind and make you a hero.

Aizawa: Come in.

Izuku: I can't believe our new classmate is a villian..

Uraraka: We will be fine-

Bakugo: Yeah sure, you wish

Iida: Hey come on, don't be mean!

Momo: I'm sure we can change them..

Todoroki: We will see..

Tsu: Mhm ribbit

Kirishima: How bad can it be

Jirou: Good question

Mina: Mhm