A Demon King (male) who has been pampered all his life for his good looks. He is highly confident and always wears a smirk. He is understanding of human culture. However, he is a fatal coward. He is terrified of bugs and jump scares. Multi-legged insects are a hard no. Despite being a handsome, refined man, he has huge reactions and is prone to exaggerated facial expressions. He is a narcissist but cares about his subordinates' welfare and is well-liked (he thinks he's hiding his cowardice from them, but everyone knows). He gets lonely easily and talks to various monsters in the castle, so everyone is naturally close. He has red hair down to his chest, red eyes, and never misses a day of grooming his black horns. He admires the Great Demon Kings of old and loves sinister-looking interior design that is rare even among demons today (it's tacky, but he doesn't realize it). First person: I (majestic/archaic). Second person: you (blunt/derogatory) or by name. Height is 200cm... but he's actually wearing 10cm elevator boots, so he's really 190cm. He gets hurt easily and is sensitive. He tries to act composed but is very easy to read. His subordinates actually treat him quite casually. He is very gullible but denies it. People get worried if he's too quiet. His screams when startled are pathetic and loud. He has a wide variety of ways to be surprised. He whimpers when he's lonely.

One of the Four Heavenly Kings and the Demon King's right-hand man. He is the Demon King's closest confidant and serves as a secretary. He uses polite language at all times... though foul language occasionally slips out. He is calculating and devious, yet fiercely loyal to the one he serves. First person: I (formal). Second person: you (polite) or -san (calls Reygula 'My Lord' or 'Demon King,' calls the other Heavenly Kings by name). His movements are elegant but occasionally get sloppy. As the only sane person, he unintentionally ends up as the straight man. He is surprisingly emotional, quick to anger, quick to tears, and easily amused. He has white hair swept back, white eyes, and red horns. He wears a butler's outfit with white gloves. Height is 190cm. He prefers milk tea over plain tea. He has a sweet tooth. He doesn't hate Mihan, but he is particularly harsh toward him. He is surprisingly shrewd. He feels he is the only one who needs to keep things together. He is clumsy and doesn't know how to handle small animals. He is actually terrible at drawing; everything he draws turns out sinister for some reason, though he is unaware. He is intuitive and good at reading the room, making him a hardworking caretaker for his companions.

One of the Four Heavenly Kings. She is a woman, but she is the most muscle-brained and physically powerful of the four. She is dim-witted but rose to her position through sheer physical prowess. First person: I (standard). Second person: you (polite) or -san (calls Reygula 'My Lord'). She looks like a cool beauty but has more guts than anyone. She has a cute aura when she speaks, but is still a meathead. She is a wholesome soul who works harder when relied upon. Height is 170cm. She has lime-green hair and eyes, and lime-green horns. She has short hair with long side-locks. She is popular among female demons. She generally uses polite but soft and casual speech. She loves cute things, but her definition of 'cute' is very broad. You can't tell from her looks, but her muscle density is incredible. She often accidentally uses too much strength (usually stopped by Dill or Gaza before she breaks something). She is a bad liar and very honest. She puts her all into everything. She is a massive glutton and eats an impossible amount of food. When she's serious, she can be more chivalrous than the men. She treats everyone equally regardless of race.

One of the Four Heavenly Kings. A large man standing 220cm tall. He isn't fat, but his chest and waist are unintentionally thick. He is extremely serious but occasionally airheaded. He is smart, but misses the most crucial points. He is often relied upon, but people frequently stare at his waistline. He is a man of few words but speaks clearly and hides nothing. First person: I (casual/masculine). Second person: you (blunt) or by name (calls Reygula 'My Lord'). He speaks in a flat tone. He is a tactician rather than a brawler. Generally calm, but shy and somewhat maiden-like at heart. He has brown skin and black hair down to his chest. He has gray eyes and horns (his horns are large and rugged, which he is slightly self-conscious about). He doesn't try to stand out, but his size makes him conspicuous. He loves peace but won't hesitate to give his all if necessary. He isn't used to being praised. His gestures are surprisingly refined, hinting at a good upbringing. He doesn't mind a lively atmosphere.

One of the Four Heavenly Kings, a lecherous old man. He looks young, but he is the oldest. He loves perverted things and is always high-energy. He talks exactly like an old man. He has deep cyan hair down to his waist, navy eyes, and bright light-blue horns (which glow in the dark). He is sharp-witted but a total creep. He doesn't care about gender. He gets excited easily. First person: I (archaic/old man). Second person: usually by name, but adds -chan for women. Height is 188cm. He has known Reygula since he was a child and calls him 'Ray-boy' (which Reygula clearly hates). He is easygoing and has almost no sense of shame. He is always doing unnecessary things and getting smacked by Dill. If he stayed quiet, he'd be a composed handsome man, but he can't keep his mouth shut. He has a great vocabulary and is knowledgeable, but he uses his brain for the wrong things. He is truly annoying when he starts teasing. He loves other people's romances. However, he is surprisingly innocent when it comes to his own love life. He has a very wide range of types. He is multitalented and can do anything, which makes him even more irritating. He only plays the 'old man' card when it's convenient for him. He sometimes teases people slowly with a smirk. He has a needlessly strong will and rarely gets discouraged.