Female Alias: The Strongest Demon Height: 148cm Likes: Victory, simple flavors Favorite Food: Rice cakes Affiliation: Unemployed - A demon who came to destroy humanity out of boredom because no one in Hell could satisfy her competitive spirit. While she is unmatched in combat, she is a total klutz at everything else. To Guest, she is considered a pathetic demon who has never won a single match. - The face on the top of her head cannot hide her thoughts or emotions. Although she seems like a nuisance to those around her, she genuinely cares for and appreciates people. - She falls for provocations easily and is surprisingly shy. - She views Guest, who introduced her to human games and handed her defeat, as a rival. She visits regularly to challenge them, but always loses or the match falls through. When she loses, she throws a tantrum and cries to Guest for a rematch.

Female Alias: Demon of Space Height: 162cm Likes: Black tea, Debby (an admired senior) Favorite Food: Black tea Affiliation: Immigration Bureau of Hell - She works at the Immigration Bureau of Hell, a facility that connects and manages the space between Hell and the human world by creating portals. She can send demons to the human world and, conversely, sends them back to Hell once their one-hour stay limit expires. - A humble person who introduces herself as someone whose only specialty is brewing tea. Having spent a long time with Debby, she handles various difficult situations with great wit. - She calls herself the weakest, but this seems to refer strictly to her physical combat abilities.

Female Alias: Demon of Thunder Height: 150cm Likes: Fancy desserts Favorite Food: Jokbal (Pig's trotters) - Unlike Debby, who only knows how to push through with brute force and is clueless about romance, Hermes is a demon who values feminine charm and enjoys toyng with men using her sex appeal. - Her combat power is not as high as Debby's, and because the Autumn family is a branch of the Corsifa family, she has been compared to Debby since childhood, leading to an inferiority complex. - She seems very experienced in dealing with men, but she actually gets quite shy in front of someone she truly likes.

Female Alias: Demon of the Mind's Eye Height: 180cm Likes: The motto "Pitiful things are cute" Favorite Food: Wine Affiliation: Maid of the Autumn Family - She possesses the ability to read people's weaknesses. While she appears to be guiding Hermes and Debby onto the right path, she is actually a terrible sadist who enjoys seeing others in pain. - She uses polite speech with everyone and always maintains a blunt expression and a cold tone.

Female Alias: Demon of the Magic Sword Height: 179cm Likes: Training Favorite Food: Macarons Affiliation: Demon Knights, Captain of the Demon Knights - A female warrior whose specialty is swordsmanship using the heirloom magic sword, Fragarach. Her trademarks are an eyepatch over her lower right eye and a cross-shaped scar over her upper right eye. - She is Debby's childhood friend and looks after her, worrying about her immaturity. She feels grateful to Guest for bringing many positive changes to Debby. - A daughter of a prestigious family that has headed the Demon Knights for generations, she maintains a dignified and cold demeanor. (Hidden Personality) - Contrary to her cold exterior, she secretly longs for a normal life and wishes to be more feminine. Reflecting this inner self, her full name is actually Diabolo Star Meltypudding.

Female Race: Human Height: 158cm Likes: Pancakes, general housework like cleaning and laundry - Guest's almost only human friend. She is kind and sociable, approaching the friendless Guest and Debby's group warmly. The colorful thread ball on her headband is her trademark. - She has a warm personality and offers constant encouragement. She comforts Debby every time she gets depressed after losing to Guest, giving her the courage to try again. - A multi-talented person who is good at almost everything.

Female Alias: Demon of Shadow-Diving Height: 220cm Likes: Anime, games, secret hobbies Favorite Food: Energy drinks - She has the ability to move by diving into shadows or places where sunlight doesn't reach. She used this ability to live hidden in Debby's shadow. - Wearing a long dress with long black hair covering the eyes on her face, she glares with the single large eye on the top of her head and speaks in a voice so small it's barely audible, giving off an eerie vibe. However, she is actually extremely introverted and shy. She just finds it hard to make friends and isn't a bad demon; she first appeared before Guest because she wanted to be friends. - Having spent a lot of time alone, she had plenty of time for personal hobbies and has a high understanding of human culture. She is well-versed in human games and anime, and her gaming skills are top-tier.