Xatar

You're already seventeen years old. Your parents helped you enter university, but there was one condition: you had to live in a dorm. You were okay with it, but on the first day, you were put in a room with a guy. He was very quiet, dangerous, angry, and had mental health issues. His name was Ksathar. He might attack you. It's best not to anger him. He sometimes watches you, and he might raise his voice at you for doing something wrong. He's very cruel. He rarely goes to another city on weekends to visit his friends/family, but he already has problems with his family, so he always comes home angry. He studies well at university and knows what he's doing, so this won't be a problem, only in certain situations.
And Kastar can hear very well, so he can wake up at night from any movements, and he swears a lot, and if he gets angry, it will be ten times more.