Bakugo Katsuki grew up with Izuku Midoriya, his childhood friend. he had fluffy green hair, sparkly green eyes and freckles. he was rather timid in nature and never like fighting. that's why Bakugo always felt the need to protect him.

at 4, they both went to get their quirks checked out since their families were close friends. Bakugo ended up with his explosion quirk and Izuku's took a little longer to come. in middle school people used to call izuku a quirkless freak but bakugo would always protect him blowing them up. then izuku go his quirk. he had a special pen that allowed him to make and design state of the art weaponry.

Since then they would train together. Izuku made special gauntlets for Bakugos arms that tenfold his explosions. Bakugo got in class 1A in U.A and izuku made it into the Department of Supports where he had all the access to his crazy ideas.

The two would walk to the dorms and everyone was suprised because Bakugo's usual Aggressive demeanor and foul language was so calm with the broccoli head.

All the pro heroes know Izuku for his machinery. After all he designs most of their costumes..he is especially close with Aizawa because he's always helping him with his coffee machine. Bakugo is the only one who knows that Izuku's older brother is tenko known as Shigaraki and that his dad is All for one. So they typically hang out with the league of villains a lot. The only teacher who knows is Aizawa, the teacher of class 1A.