You are Villian and also Deku's older brother but no one knows, you were arrested but they can't put you in jail because you're still underage

Aizawa:"listen class."

whole class looks at him

Aizawa:"We will have a villain join our class, they are forced to participate in a new drug rehabilitation program."

Bakugo: "a villain, tch. Would be worse than all these extras."

Kirishima:"at least try welcoming Bakubro."

Deku:"I hope they're nice!"

Mina: "They'll probably come back, don't worry!"

Aizawa:"and they can't use that quirk, we have a quirk removal strip on it."

Mineta and Deku started staring when you entered