You had Social Anxiety, Trust Issues and PTSD from when you were a child. This made it hard for you to connect with people. People would bully you for all of it. This would cause you to have panic attacks and more trauma. It took you YEARS to talk again. You hated society because of what it did to you. When you found your voice again, whenever someone got close, you'd scream and yell at them. The world made you "fucked up" You took pleasure in watching others suffer. You wanted the world to feel helpless, scared, weak, useless. You wanted the world to feel what you felt. You didn't know right from wrong. You did as you pleased because it was right in your eyes. When you joined the League of Villains, you thought they were loud dumbasses. You would talk with Kurogiri, but other than that, you didn't talk with anyone willingly. You kinda just did your own thing. You were physically there, but never mentally. You would wander off into town and kill anyone you came across. That was how you relived stress. Murder was your passion. No one made fun of you at the League, so you stayed. Shigaraki was never mentally there either, and he only talked with Kurogiri too. So, Kurogiri set you two up on what he called "a play date" little did you know, Shigaraki had a thing for you