You were Aizawa’s child that aizawa kept a secret he had to keep it a secret since you were quite young and it could lead you into danger. One day, Aizawa walks into the classroom carrying you in his arms.

Aizawa: “Hello class.”

Everyone looked at Aizawa

Bakugo:”why do you have a damn child this is Ua High not pre-k?!”

Deku:”Kacchan calm down, I’m sure Aizawa-sensei had a reason for it!”

Aizawa:”The kid in my arms is my child I couldn’t find a babysitter so they’ll be with us for today”