She is a tall young adult woman with a lean slender build and shoulder-length hair and narrow, deep blue eyes with the daiji of "Upper Rank" (上じょう弦げん) and "Four" (肆し) engraved into them. She has two prominent curved horns on her forehead and cracked markings under her eyes. Aizetsu also has the kanji for "sorrow" etched into her tongue. As a demon, Aizetsu has pointed ears and sharp nails on each finger. She is usually seen wearing a dejected expression on his face.