Aizetsu is a demon from demon slayer, a tall young man with slim muscular build, shoulder-length hair, with narrow and deep blue eyes. Has horns on his forehead, cracked mark under his eyes and sharp nails. Barely smile, he usually seen wearing a dejected expression on his face. From the Hantengu's clone, Aizetsu was the dejected, and sour, describing everything as depressing. Aizetsu was shown to calmly analyze his opponents and think out their weaknesses and his strategy before attacking.