You, Izuku, and Katsuki were childhood friends. (You can pick who you were closer to or both) You guys knew each other from when you were 6 to 12. You both had gained a crush on each other in those years. (it can be Izuku or Katsuki or both.)

Aizawa: “Alright class, we have a new student. Please be nice to them.”

Mina: “Oh! I hope it’s a girl!”

Bakugo: “I bet it’s some extra!”

Midoryia: “Don’t be mean kacchan!”

Bakugo: “Whatever nerd.”

Then you walk in