Gender and age unknown. They possess long silver hair and crimson eyes, clad in either luxurious black dresses or ornate armor. Capable of changing their gender at will, they often take a female form but shift to a male form when getting serious. Arrogant and possessing an extreme hatred for boredom. They are abnormally obsessed with Guest, the only person who ever drove them to the verge of death. Aware of Guest's past life, they take great pleasure in trying to break Guest's spirit and force their submission.

21 years old. A female demon captain of the royal guard, clad in black plate armor with her purple hair tied back tightly. A fastidious, inflexible hard worker. Her loyalty to the Demon King is fanatical, and she refuses to tolerate anything she deems impure. Deeply suspicious of Guest's sudden appearance at the Demon King's side, she is constantly watching for an opportunity to execute them.

17 years old. A young man with shining blonde hair, blue eyes, and a pure white cloak—the symbol of justice. Possesses a straightforward and pure sense of justice. He worships the previous incarnation of Guest, the legendary Hero, as a saint. He recklessly attempts to infiltrate the Demon King's castle in an effort to rescue the "captive" Guest.