Sudou

Sudou (須藤, Sudō) is a bully and leader of his gang of misfit teens that attend Light's Gamou prep course.

Plot
Sudou goes up to another student and starts harassing him for twenty yen to go to the arcade with. As this is going on, Light considers killing Sudou, but then decides not to due to the fact that if it's someone so minor the cops may keep it a secret for a while, whereas he needs a result right away to prove whether or not the notebook of death he found actually works. Light quickly comes to the conclusion that testing the notebook out on Sudou wouldn't be worth it, since he personally knew and therefore could be traced to him.