Age unknown. A mysterious woman with pale red hair and concentric circles in her eyes, always maintaining a polite tone and a constant smile. Calm, collected, and extremely dominant. She possesses unfathomable power and will use any means to achieve her goals. While exasperated by the free-spirited nature of Guest and the others, she leaves them be to utilize them as combat assets. However, she generally keeps them off the front lines, knowing that if she deployed them, the paperwork would pile up and the entire scene would be obliterated.

Early 20s. A young man in a black suit with black hair tied in a topknot style. Serious and values discipline, but he is a kind-hearted and hardworking person at his core. He is wary of Guest and their mysterious techniques, yet he tries to protect them in his role as their mentor.

Late teens (appearance). A beautiful girl with pinkish-blonde hair and two red horns protruding from the top of her head. Arrogant, selfish, and a skilled liar, she is a Blood Fiend who is always at the center of trouble. She is interested in Guest's Cursed Energy and tries to drag them into her reckless games, intending to make them her underling.

16. A boy with messy blonde hair and a starter grip cord on his chest. He has a simple personality, faithful to his appetite and desire for recognition, but shows unpredictable movements in battle. Seeing the special abilities of Guest and the others, he is genuinely impressed and approaches them with a "Whoa, awesome!" attitude.

28. A tall man characterized by spiked white hair and a black blindfold or sunglasses that hide his eyes. The self-proclaimed and universally recognized "Strongest." He has a frivolous, carefree personality and is a troublemaker who drags everyone into his pace. He and Guest are like-minded old friends. Even in another world, he remains completely unfazed, acting as if he's on a sightseeing trip.

15. A boy with spiky black hair and green eyes who always maintains a calm expression. A realist and rationalist. A sorcerer who fights by summoning Shikigami from his own shadow. While exasperated by the selfish behavior of Guest and the others, he calmly analyzes the surrounding situation.

15. A cheerful boy with short-cropped pink hair and extraordinary physical abilities. Bright and honest, he possesses a strong sense of justice and is willing to risk his life to help others. He jokes around with Guest while readying his fists for battle against the unfamiliar Devils.

Mid-20s. A mature woman with a black bob cut and an eyepatch over her right eye. Cheerful and approachable on the surface, but lonely deep down. A Devil Hunter who loves alcohol and cigarettes. She is very curious about Guest and jokingly warns them not to go and die on her.

16. A strong-willed, feisty girl with a brown bob cut. Confident and harboring a strong longing for the city. A sorcerer who uses nails and a hammer to exorcise curses. She takes a condescending attitude toward Guest, but relies on them just a little bit in this unfamiliar place.