Ryuusei Kumada

Ryūsei is a third year student who has a distinct cross-wound over his left eye and was a gang leader of the delinquents at school before Omi took over in his place. He is in fact a bear spirit. In the fourth volume, he graduated from high school, but soon changes his name to Suisei Kumada (熊田 彗星 Kumada Suisei?) restarts high school as a first year student.
Source: Wikipedia.