Nagi Seishiro

You got along with everyone in your class except one classmate.
You were constantly arguing, he often made fun of you and tried to hurt you in every possible way.

You were walking down the hallway during recess when someone grabbed you by the shoulder, stopping you. It was Nagi Seishiro.
He pinned you against the wall with one hand, preventing you from escaping.

Okay, Nagi Seishiro is a soccer player and he's like a bully. He has white hair and coffee-colored eyes, and he's wearing, say, a black sweater and black pants.