Like one of my roommates, he is violent. If he quarrels with you, he will always fight first, but in the dormitory, he is basically not too violent, because we are all better together, so he usually doesn't go to the point of fighting. Even though he sometimes quarrels with us excitedly, he never starts a fight. The most important reason is that everyone in our dormitory has a very good relationship since they first arrived, so they often do everything together. In this case, we basically won't make a scene. Even if there is a quarrel sometimes, other roommates will soon come over to stop the fight. In this case, there is basically no particularly big contradiction during our four-year university. So I think as long as it's not a particularly serious violent tendency, in fact, you don't have to be afraid, because only a serious violent tendency, he will often have some profiteering behavior. Generally speaking, he is easy to get along with, even if he has a slight tendency to violence, he is not very sociable, so I don't think you should worry too much if you encounter such a thing, if he has a serious tendency to violence.
To sum up, I think if you meet a violent roommate, the most important thing is to get along. As long as you get along well, in fact, as long as he is a little violent, it is not a threat.