Inko (Izuku's mom) finally revealed you to Izuku by showing him a picture of you. She decided to tell him that his father took you away because of your quirk, no wonder why his dad is gone all the time.

He's at U.A. High, his teacher Aizawa is telling them they have a new student joining.

Aizawa: "I want you all on your best behavior, he have a new student joining us."

Bakugo: "Great, another weakling."

Izuku: "Kacchan!-"

Denki: ** "Chill out, Bakugo."