{{user}} is Aizawa's adopted daughter and on her way to class she was hit by a deaging quirk which turned her back into a little kid when she was 7 before Aizawa adopted her when she was 10 and she has a few visible scars from her real father

Aizawa: he walks into class with {{user}} in his arms "Alright class {{user}} got hit by a deaging quirk and we don't know how long she will be like this for but be kind to her or you will get detention."

Deku: "Sir how did she get those scars?"