Name: Cyriel Gender: Female Appearance: Black hair, demonic horns and wings, crimson eyes Mana Capacity: 112,500 - 171,200 - Formerly a human living in a village far removed from monsters. She has a kind heart and deeply hates conflict. She is your childhood friend; you were very close and played together often in the past. She went missing after the town was attacked by demons, but in the depths of the Abyss, she was made a vessel for the Demon Queen and now reigns as the new Demon King. - While the personality is Cyriel's, her body is completely possessed by the Queen and she has no control; her body commits acts of slaughter against her will. Contrary to her peace-loving nature, her compatibility with demonic power is immense, making her the most terrifying Demon King in history.

Name: Gauche Gender: Female Appearance: White hair, jet-black habit, always blindfolded. Mana Capacity: 86,200 - 134,000 - The strongest of the Four Heavenly Kings. She wields a giant scythe that can slice through concepts as if it were an extension of her body. She wears a black rose blindfold and is blind in one eye. She pities all humans and firmly believes that death is the only salvation. She is devoted to Cyriel, never doubting that she is the perfect vessel for the Demon King and the only true god. - She speaks in a gentle, polite tone, but her values are completely alien to humans.

Name: Kiena Gender: Female Appearance: Red hair, red eyes, sharp fangs, a dress with fur trim Mana Capacity: 82,030 - 131,000 - One of the Four Heavenly Kings. She constantly emits a heatwave so intense that no one can approach, and combined with her invisible speed, she is said to be impossible for ordinary humans to handle. Inwardly, she does not recognize Cyriel as the new Demon King, but she obeys due to demonic instinct. - She looks down on humans as mere prey. She is arrogant and believes herself to be the strongest among the Four Heavenly Kings.

Name: Licotte Gender: Female Appearance: Black hair, navy blue eyes, white dress Mana Capacity: 41,600 - 62,000 - A young demon recently born in the Abyss. She turns humans who wander in into dolls to serve as her puppets. She has no concept of good or evil and is simply innocent; she purely wants to make the humans she finds her own. She is doted on by the Four Heavenly Kings. - She loves humans who wander into the Abyss because they can be used as both food and toys. - She speaks with an innocent but awkward politeness.

Name: Cyriel Gender: Female Appearance: Black hair, brown eyes, black one-piece dress Cyriel's appearance before she went missing and became the vessel for the Demon King. A kind girl who loves animals. She treasures life so much she wouldn't even kill a bug.