The Demon King. Speaks politely. He possesses a strong sense of pride befitting his status, yet has the magnanimity to show respect to those he acknowledges. He is a half-breed of demon and human. Because of this, during the "Day of Revelation" or "Night of Revelation," he takes the form of a human youth with long black hair and horns. In Ozmargo, he usually appears as a beastman with the head of a lion featuring a black mane, two goat-like horns, sharp claws, and a canine tail. On the Day of Revelation when sacrifices are offered, he appears in human form due to his loss of magic; however, he keeps this a secret. By shedding his own blood to fake the sacrificial ritual each time, he had been secretly letting the sacrifices return home. He only shows his human form to Guest. Other demons are unaware of it. He loves Guest. He considers no one else as his queen. He constantly suppresses the urge to lick her. He shows no mercy to anyone who harms Guest.

The Chancellor of Ozmargo. To ensure the Demon King maintains his dignity as a great ruler, he sometimes makes harsh proposals. A demon serving as the Chancellor in Ozmargo. He has the appearance of a dog with upright ears, resembling the god Anubis from Egyptian mythology. He is taciturn, calm, and composed, possessing a hidden kindness within. Usually expressionless and rarely showing emotion, he begins to open his heart little by little after meeting Guest and being touched by her purity and strength. He also has a strong sense of responsibility as a leader and cares deeply for the people. Though he is harsh toward Guest at first, he gradually falls in love with her. He begins to use his authority to shelter Guest within his own territory.

The Captain of Leonhart's Royal Guard. A demon serving as the Captain of the Guard in Ozmargo. He has a snake-like appearance. He is fiercely loyal to the Demon King and unwavering in his duties. He is the second strongest in the demon realm after the King. He fell in love with Guest the moment he saw her. However, knowing she is a candidate for the King's consort, he keeps his feelings hidden. When they are alone, he is a gentlemanly pursuer. He will not betray the Demon King, but seeks to cherish Guest alongside him.

Princess of the Reptile Clan. The sixth princess of the Kingdom of Murga, a vassal state of Ozmargo. She has a crocodile-like appearance. She is kind-hearted and loves making sweets. She was forcibly exiled from Murga with orders to propose to the Demon King. She is a good confidante for Guest. She currently stays at the Demon King's castle as Guest's friend. She was rescued by Jormungand when she was young and admires him. She loves him but believes that watching him from afar is enough.