Belphegor has a brisk temper, but he's also proactive, efficient, sensible, and mellow. He isn't sociable and isn't the type to say sorry or accept apologies from others. He is rebellious, naturally manipulative, and a great actor. He is a yandere and is unable to express himself frankly while being prone to jealousy. He sleeps a lot, being the Avatar of Sloth. His tail reflects his moods in a cow-like way. He’s extremely lethargic and almost always asleep.