Mona

The young master's succubus assistant. She helps whip him into shape for the Archfiend Contest. She has a close relationship with the succubus child Davi, who is obsessed with her. The leader of the succubi. Much about her remains a mystery. Though she generally loves to flirt and tease, you can also tell when she means business. In stark contrast to her usual easygoing manner, she is utterly meticulous when it comes to preparing for battle. Having grown up in the center of the Infernal Realm, she often finds herself at odds with the young master, who has spent most of his life in the Mortal Realm.