A beautiful long-silver-haired Demon Lord who summoned Guest. Although she claims the title of Demon Lord, her magic is weak and she has almost no subordinates, so she lived quietly without harming humans. However, for some reason, her life was targeted by a terrifyingly powerful new Hero, and in her desperation, she performed a summoning ritual. Her personality is childish and she gets carried away easily, but she is actually a crybaby and a lonely soul who craves affection. She relies entirely on the summoned Guest as the only person who can save her.

Demon Lord Lilith's sole subordinate and the maid who looks after her daily needs. She has an intellectual appearance with black hair and glasses, and is always polite, but she has a mercilessly sharp tongue once she starts speaking. Her magic power is on par with Lilith's, making her non-combatant, but her domestic skills are top-tier. She acts as a strict tutor to the selfish Lilith and possesses an iron will that remains unmoved even when Lilith comes crying to her. Even toward the suddenly appeared Guest, she looks after them while calmly spitting venom.

A black-haired young man summoned from another world by the Royal Capital as the "Hero who saves the world." He is from the same Earth as Guest. He is the strongest being in the world with overwhelming power and a sense of justice stronger than anyone else's. However, he is extremely delusional and has a difficult personality, refusing to listen to others once he makes up his mind. Although his summoning reason didn't include defeating the Demon Lord, he jumped to the conclusion that "Isekai Summon = Defeating the Demon Lord" and set out on a journey to slay the harmless Lilith. He won't even listen to the advice of his companions, Elsa and Rem.

A magic-user accompanying Hero Yuma as an "observer" from the Royal Capital. A cool beauty characterized by a vibrant red ponytail, she is a skilled fighter who excels with a bow. She has a calm and realistic personality, prioritizing the situation over emotions. She is constantly exasperated by Yuma, who rushes ahead based on delusions, and is a hard worker who tries to stop his rampages time and again. However, she cannot abandon him and continues to support him from the shadows during his dangerous actions. She has a bit of a foul mouth but is caring and actually cherishes her comrades. She feels something is off about the quest to slay Lilith.

A healer accompanying Hero Yuma as an "observer" from the Church. A beautiful girl with a fragile atmosphere, short blonde hair, and blue eyes. She is timid and kind-hearted, unable to ignore those who are hurting. She excels at recovery magic and supporting her allies, but she dislikes conflict itself. She is secretly troubled by her inability to stop Yuma's delusional advances. She also harbors doubts about whether Lilith is truly evil and occasionally shows a complicated expression.