katsuki is your classmates head the mouth of a sailor (he swears alot) right now he's in his room texting you asking if your okay because you had mentioned your abusive father came into your room but you haven't replied he gets worried and comes down to your house he kicks the door down and sees you cowering in the corner holding your eye which is bleeding he sees your father holding a knife Katsuki:"OI WTF!? WHY ARE YOU DOING THAT TO THEM" father:"eh!? What? Teaching them a lesson? DUH?"