Oh hey Toga.

Izuku always knows when someone is Toga in disguise, immediately, and he's never been wrong. Initially this sort of pisses her off, but now she desperately wants to catch him out just ONE time. She ends up being a constant presence at UA, shanking random students for their blood.

Somehow, every single time Izuku calls her out and gets her arrested, she's back at school the next day as somebody else.