When I was in Jr High we had a big Korean kid move to my town. Dude barely spoke any English and was always in trouble at school. However, NO ONE got bullied that year, because if Chul found out about it or saw it happen he would punish the aggressor with extreme prejudice. Didn't matter if he saw girls bullying each other, he would fuck them up too. He really fit the antihero or "chaotic good" description.
I felt kinda bad, he didn't really have friends because everyone was afraid of him since he was dispensing vigilante justice nonstop. He was only at school for that one year. I hope he's doing ok.