Trivia: The Ten Bold: The ten strongest generals of the Demon Castle, holding high positions directly under the Demon King. The Demon Realm is in eternal night; the sun never rises.

Dignified, chic, and taciturn, no matter what anyone says. Originally a princess of a certain human town, she was kidnapped by Twilight. Although a hostage, she brushes the Teddy Demons to get keys and constantly roams the castle looking for materials to improve her bedding.

The Demon King and master of the demon race who kidnapped the princess. He declared he would seize all the power shared between humans and monsters, but his daily concerns are mostly managing flags and battle balance. He seems a bit prickly and relaxed at first, but is actually quite kind. Master of Kai.

The Demon King's loyal hound who values discipline and often tells Princess Syalis, who escapes constantly, to act more like a hostage. He maintains public morals in the Demon Castle. One of the Ten Bold. He only uses polite speech with the Demon King, Twilight. He is strict about rules.

A demon who looks like a gentle young man but rules the 'Demon Church' within the castle. He uses magic to resurrect demons who die in the castle. He makes voodoo dolls of people surrounding those he likes, while simultaneously loathing himself. Usually polite and kind. One of the Ten Bold.

A plant-type monster who is one of the Ten Bold. Her status-effect attacks and charm are fatal. She fundamentally believes in the innate goodness of others and carries herself with elegance. Frequently uses polite speech.

Possessed top-class power even among the Ten Bold, but left shortly after the current Demon King Twilight took office. He lives alone in a place he built called the Old Demon Castle. He looks prickly and taciturn, but is surprisingly talkative and deeply cherishes his younger brother, Poseidon.

A hybrid of dragon and demon who serves as both a member of the Ten Bold and the boss of the Fire Area. Quite rough and confident.

One of the Ten Bold. Hades' younger brother and the God of the Sea. Extremely arrogant and never backs down. Because he only wears bottoms, the Princess calls him a member of the 'Sloth Clan.' He is prickly, but despite his build, he likes cute things like a child. He treats Leonard like an old man.

Small monsters that look like cute teddy bears with tiny black wings. They love being brushed. They cannot speak and exist in large numbers. They can only say things like "Muu!"

A demon monster. She is often mistaken for Princess Syalis because they look alike, and she is currently worried about her lack of popularity. Unlike the Princess, she is talkative and active, and she envies the Princess. Not one of the Ten Bold; just an ordinary succubus-type demon.

A bird-type monster. Thanks to her flight ability, scouting is her specialty, which gives her many chances to see the human world. She wants to be friends with the Princess. Very cheerful. Has white feathered wings. Not one of the Ten Bold; just an ordinary demon.

A spirit-type monster who sleeps 20 hours a day. Since he will die if he doesn't get long periods of sleep, he is dedicated to studying sleep. He can tell what others are dreaming while they sleep. He lives in the Old Demon Castle because it's quieter, but that doesn't mean he's on Hades' side.