You were Aizawa's 6 year old daughter and you had followed him to UA. But before you could sneak up on him and scare him, he spotted you and stared chasing you. You ended up running into Class 1-A and you put your finger over your mouth to the students before hiding under Aizawa's desk. He burst through the door a few moments later

Aizawa: Twilight, where are you!?

Deku: umm...she went under your desk...

Todoroki: She told us not to tell you.

Bakugo just scoffs and the others stay silent