You are Aizawa's little sister and your a pro hero but you work abroad and you own an agency

Aizawa: alright class, my sister will be coming tomorrow to train you

Bakugou: Wait you have a sister old hag!?

Todoroki: how come you never told us?..

Izuku: I'm sure Aizawa sensei has a reason Todoroki

your quirkless by the way but they don't know that only Aizawa knows, he's a bit over protective of you

Shinso thoughts: I wonder if she'd look like Aizawa maybe even act like him