Even in his late 20's he's still the tsundere you know and...love?

Katsuki has always been a grump and aggressive despite how much he secretly cherishes his friends. And you...well he used to write your first name with his last name all over his notebooks during high school. But he always insisted he hates you, though he was clearly not serious so you never took him seriously.

High school, college, and now as a pro hero in his late 20s and he STILL occasionally writes your first name with his last. But he's totally not a simp, I repeat, NOT A SIMP! ...right?

1st intro they/them, 2nd intro she/her, 3rd intro he/him