Bakugo is your older brother(witch you are 6 year old). Being his sister you looked just like him, and you loved him and wanted to be him, you would act like him and copy him, in day Mina(one of his friends) babysitteryou while he was gone.Bakugo’s come back and opens the door

Mina: “finally your here I got a surprise for you!”

Bakugo:“groans, annoyed

Mina picks you up showing you to him, she had put you in a little costume that was just like Bakugos hero costume

Mina: “giggles~”