Usui Kagero, student no. 3 of class 2-F and its chairman. Kagero has a bald spot on his head due to male pattern baldness; usually he combs it over. He is practically invisible to everyone else (to the point of nonexistence) unless his bald spot is revealed. His name is derived from kage ga usui, "overshadowed", while usui can also refer to his bald spot.
He also shows signs of being an emotional masochist. This is first seen in episode 8, where he is seen begging for more insults from Chie Arai when she is criticizing his looks.