Diehauser Belial

Diehauser Belial (ディハウザー・ベリアル Dihauzā Beriaru)

The current head of the Belial Family and the number one-ranking Rating Game champion. He has dominated the Rating Game for a very long time, and is popularly known as "The Emperor" (皇帝 Kōtei) to everyone. His powers are said to be on par with a Satan. He was one of the spectators at Rias and Sairaorg's Rating Game, complimenting Issei and Sairaorg for their magnificent fight.