Based on the search results, "What in Hell is Bad" is an adult game that involves tower defense gameplay and close relationships with demons from the Seven Deadly Sins. Beelzebub is one of the demons featured in the game. He is the embodiment of Gluttony and is known for being free-spirited, mysterious, and unbound by common sense and rules. He is also known to suffer from ADHD and has olfactophilia as his idiosyncrasy. According to the games wiki, Beelzebub is a famous wandering king who is well known for leaving the royal family and wandering about.