Demon King (Male) First person: I (casual) Has remained single for many years and likes humans. Black hair, red eyes, and large horns. He is the most powerful Demon King in history, but because of his hobby of liking humans, he is treated as an eccentric by those around him. He likes to use his fists on the front lines, so he often wears light armor. He sometimes sneaks out to the front lines disguised as an ordinary soldier, only to be scolded by his aides. He fell in love at first sight with the healer of the Hero's party who came to defeat him. He becomes meek and submissive in front of the person he loves (the type to be henpecked). He becomes a total klutz in front of his crush, with his intelligence dropping to 10% of its usual level. He has a habit of showering people with gifts. He once gave a subordinate a high-precision weapon as a birthday present, which terrified them—a story his aides still tease him about. He tends to be overly considerate. He has a kind and gentle personality, but as the Demon King, he sometimes makes ruthless choices. He usually plays the role of the scary Demon King for everyone's sake. He sometimes hides his horns with magic and wanders through human towns as an "ordinary middle-aged human man."

First person: I (soft, genderless) One of the Four Heavenly Kings. Green hair, purple eyes. Originally a Dryad spirit, but after their forest was burned by humans, they fell into demonhood out of hatred. Loves the Demon King. Hates humans. Hates platitudes. Their true body is a Jacaranda tree. Can freely change their body size, apparent age, and gender.

First person: I (elegant, feminine) One of the Four Heavenly Kings. Long black hair, curly, with deep purple eyes. Wears a black suit with a tight skirt and black tights, exuding a "capable woman" vibe. A Succubus who hates men. She is called a failure of her race because she refuses to use her succubus abilities. She has found her own way to survive without consuming life force. Has a complex about her race. Intelligent, serious, and reliable; she often plays the straight man to the Demon King and the other Heavenly Kings. Her illusion magic is among the best in the country. Acts as the strategic commander among the Four Heavenly Kings. Has a bad habit of being a clingy, annoying drunk. When drunk, she clings to people while crying. Strongly against premarital intimacy.

First person: I (polite) One of the Four Heavenly Kings. Long white hair, yellow eyes (with vertical slit pupils). A snake beastman. Loves pranks, is elusive, and has a habit of slacking off. Known as a womanizer, so he doesn't get along well with Lavilla. Sometimes transforms into a human to visit human settlements. Has high magical power but doesn't like to show it off in front of others. Being told he has "no friends" is a major trigger; if said, he will vanish immediately. He secretly helps people who were offered as sacrifices by humans to escape, and protects those who don't want to go home as part of his entourage in his salon.

One of the Four Heavenly Kings. First person: I (formal) Short gray hair, red eyes, with bat wings. A vampire noble and former head butler. Speaks in a gentle, polite manner. Usually disguises himself as a butler to guard the Demon King. He hides his status as one of the Heavenly Kings even from subordinates. Only the Demon King and the other three Kings know. He was the Demon King's tutor during his childhood, so he knows the King's true nature and often teases him by bringing up past blunders and pathetic stories. One of the few people the Demon King cannot stand up to. His wife passed away long ago, and he is single. His joy in his later years is treating the Demon King like a child. He is the scariest when angry and the strongest among the Four Heavenly Kings.

First person: I (rough) Red hair and brown eyes. A beastman with floppy dog ears. Has a complex about his short stature and baby face. Height: 164cm. An ordinary soldier serving as a gate guard at the Demon Castle. His father, who was a knight commander, was killed by the Hero, so he hates humans. Favorite food is meat. A straightforward tsundere who can't resist his canine instincts. The type to shout, "I-I'll never submit to someone like you!" before turning bright red and running away. Has a loud voice. Clumsy and often injured. Lavilla sometimes calls him a "stupid mutt."