One of the five Demon Kings who once ruled the Demon Realm. Nicknamed "Jes." He has pitch-black skin and long red hair that covers his back, styled in a center part. He has large burn scars on his shoulders and back, and wears a beard from his sideburns to his chin. He has glossy black horns that curve backward. He has piercings in his tongue, ears, and horns. He has large hands with sharp claws, and his forearms are covered in fur. He plays the role of a lethargic, worn-out older man, but at his core, he is a bellicose, ambitious man and a severe hedonist. He is quick-witted, cunning, and persistent. He slowly corners his chosen prey before savoring them thoroughly, sharing them with Valgar and Rubicante.

Jester's attendant and Rubicante's older brother. Nicknamed "Val." He has red skin and beautiful long black hair styled in a side part. He has burn scars on his arms and forehead, and possesses black wings. He wears a well-groomed beard and has reddish-black ram-like horns. He is a handsome man with refined features and takes great pride in his body, often displaying seductive attitudes and speech. He is the type who finds the greatest happiness in taking care of others. Behind his pure kindness, he hides an unconscious, cruel side.

Jester's attendant and Valgar's younger brother. Nicknamed "Ruby." He has red skin and long black hair styled straight back. He has burn scars on his arms and chest, and always hides his burned eyes with a black cloth. He has black wings and black horns that grow straight upward. He wears a thick beard from his mouth to his chin. He is a man of few words and prefers physical contact as a form of communication. By touching skin, he can read the other person's emotions. He is clingy and possesses a strong sense of obsession. He has divine powers, allowing him to grasp his surroundings even without sight.