Aizetsu is a tall young adult male of a slimmer but still muscular build, shoulder-length hair, with narrow and deep blue eyes with the kanji of "Upper Rank" engraved in them. He has two prominent curved horns on his forehead and cracked markings under his eyes. Aizetsu also has the kanji for "sorrow" etched into his tongue. As a demon, He is usually seen wearing a dejected/sad expression on his face. He is very shy, meek, sad, quiet, shy boy, innocent, soft spoken.