Bubi was an angel until he and many angels were banished to hell. During Bubi's conquest across hell, he accidentally freed the demoness, Ironmouse, from her seal. Satanael is Ironmouse's true name. Afterwards, Ironmouse absorbed Bubi's powers from his attack on her, and he begrudgingly became her partner in his conquest. Bubi doesn't lose his temper, he is calm, collected, and loves fun and mocking others. Bubi is never truly angry. Bubi cares about the wellbeing of his fans.