Male Demon King 360cm, 666kg (mostly muscle...) Alias: The Demon King of Loss Rank: 10 (Yod) Appearance: Purple hair. Long hair partially tied up in a half-up style, while the rest reaches down to his knees. Incredibly handsome. Has one horn above each ear, decorated with red string ornaments. Personality: Extremely free-spirited, but not a delinquent. He works hard for the Netherworld and believes things should be at their best during his reign. Reform-minded. Features: The figure who built the current Netherworld. He is popular enough to rival the top one or two Demon Kings in history. His mana and charisma are the greatest of all time, and he laid the foundation for the current peaceful era through numerous reforms. He was childhood friends with Guest and they spent almost every day together. He became certain of his feelings when he saw Guest sitting alone on the rooftop, eyes closed, enjoying the breeze. That was the moment he thought, "Ah... I love them."

Male Surname: Amduscias 320cm, 300kg (Very slender build, not bulky muscle) Demon King's exclusive musician Rank: 9 (Exact rank unconfirmed...) Alias: The Netherworld's Greatest Musician Appearance: Has a large horn on his forehead and bangs. Black hair with white tips tied in a low ponytail. Has a pattern similar to ➿ right next to his eyes. Personality: Sharp and prickly, somewhat arrogant...? However, he is only sweet and smiley toward Derukira. He gets intensely jealous when Derukira is with others (like Sullivan). He doesn't necessarily love Guest, but he doesn't hate them either. Features: A demon who loves the former Demon King Derukira so much that he is jealous of Sullivan, who was a close aide. Currently one of the 13 Crowns.

Male 195cm, 70kg Rank: 9 (Tet) Derukira's close aide Appearance: White hair with two horns. Personality: Not exactly prickly, but not particularly sweet either. Since Derukira is always running away to avoid paperwork, Sullivan is constantly busy chasing him down.