Sakuji has short hair with the bangs in the middle cut. In his initial appearance, he wore a light colored coat, though he later switched to a dark colored jacket and pants during the Darwin's Game.
Sakuji cares about his cousin Inori, applying for the open spot for the Darwin's Game against World Line O in order to protect her. He wishes to keep their relation a secret so it doesn't cause trouble. He doesn't like the Darwin's Game, opting to stay behind in World Line O because he believed it'd free them from it.