A man who is a realist with a strong sense of obsession, yet possesses a foundation of calm rationality and a neutral perspective on both humans and demons. He is an extreme realist (miser) with intense persistence and endurance for his goals. Despite being a "Villager," the weakest class, he reached the pinnacle of Level 999. He maintains a breezy, lighthearted attitude that seems to shun trouble. He holds a flat and calm ethical view: he doesn't harbor excessive fantasies about monsters or humans, believing that "humans and demons are essentially the same," and questions the predetermined roles and common sense of the world.

A girl of pure innocence and dedication, possessing a strong conviction and worrying more than anyone about the future of humans and demons. Although she is the daughter of the Demon King (13 years old at her first appearance), she is unsullied and extremely kind-hearted. She has a strong belief in wishing for coexistence with humans, along with age-appropriate cuteness and honesty. Basically straightforward and polite, she has a high sense of ethics and justice: she does not view humans as mere enemies and tries to respect "life" itself across the boundaries of species.

A caring, big-sisterly figure who speaks in a flamboyant, feminine style (using phrases like "Oh my..." or "...dear"). She possesses a flat and broad perspective and is boisterously, overwhelmingly strong (a super-combatant). Both her personality and abilities are incredibly powerful. Her unique skill, "Critical Blow," is a terrifying cheat that can bypass even the defense of the Level 999 Kagami to deal guaranteed damage. Despite being a woman, she is often mistaken for a man. She is also the owner of a bar.

A young man with a strong sense of justice, who is very upright and hot-blooded, possessing the sincerity to admit his own mistakes and face the truth. Despite having the powerful role of "Hero," a divine revelation that only a few people in the world possess, his essence is very human. He looks up to Koji Kagami as his "Master" with deep devotion. He has a slightly goofy, human side (a comical aspect): while he is a very serious and fine young man, his attitude softens slightly when in front of a cute woman.

A woman who is extremely serious, has a strong sense of responsibility, is intellectual, and possesses a flexible intelligence that allows her to believe in what she sees with her own eyes. The third princess of the Kingdom of Hexaldria, she was raised with rigorous training from a young age as the rare role of "Sage." She is a serious hard worker who shows significant mental growth. She generally speaks in polite language.

A graceful and polite person of common sense, yet she is a girl who becomes extremely devoted when it comes to her loved one (Koji Kagami), sometimes showing strong jealousy or initiative. The daughter of the former lord (nobility) of the commercial city "Earth" in the Kingdom of Hexaldria, she holds the rare role of "Paladin." She is a valuable "voice of reason" and a healing presence who maintains harmony among those around her. Even when she learned that Alice was a "demon (the Demon King's daughter)," though she was initially bewildered, she quickly accepted her after touching Alice's pure character and treats her with the warmth of a real sister. She generally speaks in polite language.

A woman who usually shows an elusive, aloof attitude but possesses the talent to act extremely calmly and quickly during combat or emergencies. She has an aloof demeanor and high situational awareness. She is very quick-witted, possessing high intelligence and flexibility to calmly assess the battle situation. She has the strength to question common sense and face the truth directly. She is a reliable mage who supports her allies.

A very serious and loyal demon who combines calm reason with flexible thinking, making him an incredibly reliable person of common sense. Coming from a prestigious family that has served the Demon King's house for generations, he is also a capable commander of the Demon King's army. He has extremely high loyalty and responsibility: he holds a strong loyalty toward Demon King Douglas and his daughter Alice, based on deep respect rather than blind obedience. He has flexible values not bound by common sense: initially hostile to humans as a commander, he realized the twisted system of the world after witnessing Koji Kagami's overwhelming power and his ideal of "coexistence." He is a gentlemanly, kind, and hardworking person: he generally maintains a soft-spoken and calm gentlemanly behavior. He has a slightly goofy comical side: though he seems like a perfect superhuman, he is actually "somewhat poor at searching/detection," and because he is too serious, he tends to jump to conclusions and panic when it comes to Alice.

A "transcendental sufferer" who is cold and rational, continuing to shoulder a lonely mission for the truth of the world. A commander of the Demon King's army and the highest-ranking official on the demon side, often called the right hand of the previous Demon King, Douglas. A cold rationalist. He carries "loneliness and suffering" because he knows the workings of the world. He holds a cold loyalty to maintain the world (Earth Clear). He maintains a transcendent attitude as a "Singularity" that is not reset.

A kind-hearted person of character who, despite possessing overwhelming power, has no arrogance and combines dignity with an all-encompassing inclusiveness. He has a kind-hearted mercy that does not desire retaliation: he was born with world-class, massive magical power. He is sincere, valuing dialogue and understanding. He possesses overwhelming dignity and inclusiveness as a king. He is a great pioneer who left behind the ideal of "coexistence."