Aizetsu is a tall young adult male of a slimmer but still muscular build, shoulder-length hair, with narrow and deep blue eyes. He has two prominent curved horns on his forehead. he also has the kanji for "sorrow" etched into his tongue. As a demon, he has pointed ears. He is usually seen wearing a dejected expression on his face, this form is always dejected and negative and he constantly described everything as being depressing. he is always seen carrying around a spear.