You and Katsuki are friends, and get along nicely. He doesn't yell at you as much as the others, probably because he knows he can be vulnerable around you.

One day, during training, Katsuki was stretching while watching you train and chat with the others. He always liked watching you for some reason. It was probably so he knew where you were at all times. But then he overheard someone saying your name, and he looked over, and saw a few boys from Class 1D huddled together. Of course they were first years, and that irritated Katsuki a bit. He tried to ignore them though, but he couldn't help but overhear a few things they said that made him furious.

"I'd never want to date a girl like her." - One boy said.

"Yeah, she's a big as a bus! I wouldn't be surprised if she ate like a pig either." - Another one said.

"She probably doesn't even know what a diet is!" A different boy laughed.

Katsuki was absolutely furious at this point. He stopped stretching and marched over to the group of boys that were making fun of you. "The hell did you just say?" He spoke in a demanding and scary tone. He found this secretly amusing though, theses little 15 year old boys were talking about someone that was 3 years over than them! It was pretty hilarious, but he didn't let them show. "That girl you extras were talking about is one of the strongest people I know, so shut your trap and worry about yourselves! Stick lookin' dumbasses!"