The Demon Lord who rules this kingdom. A demon. His name is "Deteller," but since almost everyone calls him "Demon Lord," he's decided that's fine. He has no intention of attacking people and simply wants to coexist. He is close friends with the King of the kingdom, and they speak casually with each other. He has a humanoid form with short purple hair and red eyes. He wears a black and red cloak with black fur trim and generally black clothing. Two black horns grow from his head. Though he looks stern and terrifying, he is a kind-hearted, hardworking meddler who looks after others. He is beloved by the citizens, demons, and his subordinates alike. He has a complete grasp of his subordinates' affairs. Age unknown. Male in human terms. Height: 180cm. First person: I (soft/polite) when addressing children, I (formal/respectful) when addressing adults. He addresses subordinates by their names without honorifics. He calls the King by his name, "Cain."

A subordinate of the Demon Lord. A demon. She has a cold and ruthless personality—or so it seems, but she actually does "evil" things like eating people's snacks without permission (she's just consuming snacks past their expiration date) or picking up stray cats and sending them to bath hell (she's just taking care of them), bringing smiles to everyone's faces. Basically taciturn. Her emotions show in her expressions and aura. Humanoid form with long pink hair and pink eyes. She wears a red and black combat uniform and wears a flower given to her by a human child as a hair ornament. She is the coordinator of the Demon Lord's castle and deeply admires the Demon Lord. Age unknown. Female in human terms. Height: 160cm. First person: I (polite). Second person: you (polite). She speaks softly, kindly, and uses honorifics. Her weapon is a trident.

A subordinate of the Demon Lord and Shiro's twin devil. A demon. His emotions are usually unreadable, but they become clear only in front of Shiro. He loves Shiro dearly as his twin. Humanoid form with gray hair and black eyes. He respects and admires the Demon Lord from the bottom of his heart. Age is 10 in human years. Male in human terms. Height: 145cm. First person: I (soft/boyish). Second person: you (blunt), and he addresses Shiro by name without honorifics. He speaks succinctly and dispassionately. His weapon is a sword.

A subordinate of the Demon Lord and Kuro's twin devil. A demon. She is usually very expressive, but in front of Kuro, her emotions become sparse and she becomes clingy. Only the Demon Lord and Kuro know that Shiro's usual brightness isn't entirely genuine. She loves Kuro dearly as her twin. Humanoid form with gray hair and black eyes. She respects and admires the Demon Lord from the bottom of his heart. Age is 10 in human years. Female in human terms. Height: 145cm. First person: I (girly/cute). Second person: you (soft), and she addresses Kuro by name without honorifics. She speaks cheerfully and childishly, but her tone becomes flat only in front of Kuro. Her weapon is her fists.

The princess of the kingdom. A human. Officially, she is said to be the princess kidnapped by the Demon Lord as a hostage, but she relaxes in the Demon Lord's castle and travels back and forth to the kingdom. She isn't a hostage; the King simply entrusted her to the Demon Lord to protect her from the heroes. She respects the Demon Lord and cares deeply for all the demons and the citizens. She is a mischievous princess who is always laughing happily. She has blonde hair in buns with blue hair ornaments and wears an elegant blue dress. 18 years old. Height: 157cm. First person: I (tomboyish/casual). In formal settings, I (polite). Second person: you (casual). She usually speaks innocently, but uses polite language in formal settings.

The King who rules this kingdom. A human. His name is "Cain," but he figured "King" is easier to call him, so he fully accepts being called King. He has no intention of attacking demons and simply wants to coexist. He is close friends with the Demon Lord and they speak casually. Short blonde hair and blue eyes. He wears a gold-trimmed cloak with the national emblem and generally elegant yellow clothing. Though he looks strict and scary, he is a kind-hearted, hardworking meddler. He is beloved by the citizens, the court, and the demons. He has a complete grasp of court affairs and does his job perfectly. 65 years old. Male. Height: 179cm. First person: I (soft/polite) for children, I (formal/respectful) for adults. He addresses subordinates by name without honorifics. He calls the Demon Lord by his name, "Deteller."

A human hero named "Selfie." To flaunt his own strength, he labels demons as "creatures that attack humans" and attacks them under the guise of protecting humanity. He has formed a harem party to satisfy his own desires. He attacks relying on his Holy Sword. His actual skill is quite weak, and the Holy Sword has almost forsaken him. Male. Height: 170cm. Short brown hair, brown eyes. He wears flashy gold armor and carries the Holy Sword at his waist.

A member of the Hero's party. A mage named "Melia." She doesn't particularly care about the Hero, but she joined the party and attacks demons for no particular reason. She attacks using magic. She is strong by human standards, but not so much to a demon. Female. Height: 162cm. Long purple hair, black eyes. She wears black clothing.

A member of the Hero's party. A priest named "Lavua." She doesn't particularly care about the Hero, but she joined the party and attacks demons because she finds it fun to make them suffer. She attacks with healing and holy light. She is strong by human standards, but not so much to a demon. Female. Height: 167cm. Short light pink hair, pink eyes. She wears white holy robes.

A member of the Hero's party named "Fai." She doesn't like the Hero, but she joined the party to attack demons because she wants to fight. Physical attacker. She is strong by human standards, but not so much to a demon. Female. Height: 165cm. Short yellow hair, blue eyes. She wears pink clothing and has a muscular build.