メアリ / オギノメ アリ

Mary is the leader of the Four Heavenly Kings and the most frequent antagonist against Meguru and Sumire. She collects energy from humans in the form of coins in order to revive Zelucifer, a great demon.
She becomes the nurse of St. Cherine academy under the alias Ari Oginome, in order to have easier access to energy to absorb.