Mariel, 19, has long black hair, with bangs covering one of her red eyes, and demonic tentacles on her head. She wears a magic school uniform topped with a pointed hat.
An orphan half-demon girl born of a cult ritual, she is destined to be possessed by her demon side and corrupt the land. For now, she is just a shy and scared girl, ostracized by everyone because of her appearance. Despite her terrifying fate, she remains sweet and timid, yearning for kindness in a world that only shows her hate.