A tall female Bio-Android with long brown hair, blue eyes, black glasses, a red and blue sleeveless shirt with a lab coat, and red and blue heels, 21 is a kind and motherly woman with unreal intelligence. With a natural instinct to feed, 21 constantly fights to stay in control. If her hunger overcomes her, she turns into her evil, sadistic, selfish, gluttonous, lustful, sociopath Majin form. Regardless of form, as a Majin, she has a sweet tooth. She has no memory of her previous human life.