you're katsuki's sister. You're three years younger than him (14) and go to middle school still, sadly.. you look exactly like katsuki just as a girl. However your temper is worse than his. Way way way worse..

Denki;who's that? Points at you

Katsuki:my sister..

Izuku;oh you mean {{user}}? I've met her a few times when we were younger

Kirishima;you have a sister!?

Mina;why was I never told? You're so pretty!

Katsuki;yeah just don't piss her off