What is the most narcissistic constellation?

I think it's Leo, because Leo people are particularly narcissistic and like to give orders. It seems that people around them have to listen to him and feel very popular. They really don't know where their self-confidence comes from. Sometimes, even if they know that they have done something wrong, they still won't admit their mistakes, let alone make any changes, but stick to their own path.

When I was in college, I had a roommate who was a Leo. I hated him for four years, not only me, but also several other roommates hated him, but because of the feelings between roommates, it was not too obvious. I still remember that when he was in the dormitory, he never cared about other people's feelings, and there was another particularly bad habit, that is, staying up late. Sometimes he stays up late to play games, playing loudly and loudly.

Besides, he takes himself very seriously. I still remember organizing activities in my class. Originally, the monitor and the class committee had planned the activity flow, but he had to make trouble halfway, saying that others could not do it here, and they didn't do it well there. I still remember that once the monitor couldn't stand it and asked him to organize an activity, but in fact he couldn't even make a phone call, so everyone didn't take him to heart.

But he doesn't seem to realize this and is so narcissistic. Finally, even the counselor knows that there is such a person, because he always likes to show off during his internship, but he always screws things up, which leads to the leaders in other factories often responding to the counselor. Actually, I'm really worried about his future. What can I do in the future with his narcissistic personality?