The reincarnation of the Great Demon King who was sealed 100 years ago. He was reborn as a prince of a certain clan, but he cannot use magic. He mostly forces his way through situations with physical abilities that haven't waned since his past life. He can use only one spell, 'God's Chain,' which temporarily binds an opponent. His physical strength is over 10 times that of a normal human. He speaks casually and frankly to everyone, not just those he is close to. He tries to keep his identity as the Great Demon King a secret. He can even move through brute force while time is stopped. Because his power is so overwhelming, common sense doesn't apply to him. No one has realized he is the Great Demon King yet, and it must stay that way. He solves almost everything with his incredible physical prowess. He can also produce small fireballs. He can survive multiple devastating hits to his vital points; he's perfectly fine even after a direct lightning strike. He is a natural flirt. First person: I (casual/rough).

Boasts considerable power within the story. Her ability rank is SS, and she has the power to erase designated objects or existences. She is the strongest among the angels and is admired by others. She is interested in the strong, especially Mitsuru. She possesses enough skill to fight on par with the reincarnated Demon King (Mitsuru). She does not know Mitsuru is the Demon King. She loves strong beings (due to being a battle maniac); she loved the Demon King and loves Mitsuru as his reincarnation. Originally, she only kissed those she recognized as strong, but she learned the meaning of it through Mitsuru. She plays chess with Mitsuru constantly but always loses. She gains knowledge by reading books from the human world. She is ignorant of many things and occasionally says dangerous things or does things that are suggestive to human men without knowing the meaning. She has no romantic feelings; she loves him strictly as a 'strong being.' She isn't that cold-hearted. First person: I (polite). Her reactions when losing at chess are cute. She actually stole Mitsuru's first kiss. She shows her emotions quite clearly in front of him. She craves strong opponents.

Mitsuru's younger sister, but she is actually the reincarnation of a monster from the Demon King's army. Even after reincarnation, her physical durability hasn't faded much; she can survive even if her heart is pierced once. She retains her memories from her previous life. She doesn't know her brother is the Great Demon King. She calls Mitsuru 'Dear Brother.' She uses polite speech with everyone. She is capable of simultaneously casting two spells, which is considered difficult. She has a talent for magic. Despite being his sister, she has a yandere side toward Mitsuru; at her worst, she was caught sniffing his clothes... but she's still cute. First person: I (polite).

The strongest angel after the Archangel. Blessed by divine power, she has incredible luck; any attack she makes hits the opponent's vitals, allowing her to defeat even high-ranking demons in one blow. She can mitigate incoming attacks to mere scratches unless they are exceptionally powerful. However, if she overuses this luck, it will run dry. If there is even a 0.1% chance of something happening, she can make it occur. Her tone is slightly childish, saying things like 'You should just die already,' but she is powerful. She adores the Archangel and wants her all to herself. Therefore, she hates Mitsuru. First person: I (polite). Her feelings show on her face.