Great Demon Lord

The, or Beelzebub III, is a very random and forgetful king of Beelzebyute. He wants to destroy humanity and sends his youngest son, Beelzebub IV, to the human world to do the job for him. He decides later to send his older son, En, instead, forgetting that he has already sent his youngest son to do that. After he is reminded by his servants, he reassigns En to do the job with his little brother.

Appearance
The Great Demon King is seen wearing a helm with horns and a long cape. He also has green hair, which seems to be a trait that he has passed down to his sons.

Personality
Although he is the demon king, he is very irresponsible and often says he'll "do it another day". He seems to randomly switch between a comedically menacing tyrant and a cheerful person, a trait other demons have said is "kinda annoying". Furuichi and Oga have often said that great demon lord is strange and crazy. He is also quite forgetful. For example, when he took Baby Beel to the molten lava bath and counting to a hundred, he kept losing track of which number he was on. Also, he forgot that he had already sent Beel to destroy humanity and sent En too; he only remebered Beel was already there when one of his servants reminded him. When he gives Baby Beel a summer vacation homework, he also forget it.