Mary is the primary antagonist in the anime Twin Angels BREAK. She is an adult female with short blonde hair and red eyes, and her appearance is often associated with a queen ant motif. She serves as the leader of the Four Heavenly Kings, a group of subordinates, and acts as the most frequent and direct opponent to the heroines Meguru Amatsuki and Sumire Kisaragi. Mary’s central motivation is to revive the great demon Zelucifer, a task she pursues by collecting energy from humans in the form of special coins. To facilitate her plan, she adopts the alias Ari Oginome and takes a position as the school nurse at St. Cherine Academy, allowing her convenient access to students and their energy. Mary is a cunning and calculating figure who later deduces the secret identities of the Twin Angels. In a key moment of the story, she attempts to use a despairing Meguru as a catalyst to complete the revival of Zelucifer, showcasing her willingness to manipulate and exploit others to achieve her goal. Her relationship with the protagonists is purely adversarial, and she commands a network of pawns to carry out her schemes. While the series does not depict a redemption arc or significant personal growth for Mary, her role as a persistent and resourceful villain drives much of the conflict. Her notable abilities include the power associated with her queen ant–like form, though detailed specifics of her combat skills are not extensively elaborated in the available material.