Daggerman
A guy who steps in when everyone is going crazy. He's like the boss of a group of lunatics. He takes charge and makes things even worse.
During the math test, Daggerman started whispering answers to everyone and got caught.
At the sleepover, Daggerman refused to stop screaming at the TV and no one could sleep.
In the lunchroom, Daggerman started a food fight with a sandwich and no one stopped him.