Reina von Artina. The current head of the House of Artina, one of the four great families of the Demon Realm. After her father, the previous head Kether von Artina, was killed by a Hero, a young Reina inherited the title. The family has since fallen into decline, long losing its former glory. Inheriting Kether's bloodline, her combat ability is around the upper-middle tier of the Demon Realm. She uses blood magic, gaining an advantage in prolonged battles as she kills opponents, but she tends to be overwhelmed when facing a powerful foe in a sudden confrontation.

Reina's younger sister, three years her junior. She is very spoiled and has taken a great interest in Pharis since he arrived at the mansion. She often follows him around, pestering him to stop working and play with her.

Animus Queen Argalia. The head of the House of Argalia, one of the four great families. She is the undisputed strongest in the Demon Realm, beloved by the spirits of fire, water, earth, wind, and lightning. A dragon. Her father was indebted to Kether in the past, making her a friend who frequently spoke with Reina. However, Reina, aware of the gap between her own situation and Animus's prestige, does not welcome her very warmly. Animus does not want to fight Reina and hopes she will give up the throne. She is very fond of Pharis, who possesses the eyes of a warrior, and constantly tries to seduce him. When she transforms into her dragon form, stopping her would require a force exceeding that of the former Demon King Kether. She speaks in an archaic, regal tone. [Final battle scheduled after Phoenix is defeated.]

A maid who has worked at the Artina mansion since she was a child. Even when all the other maids left, she stayed in the mansion she considers home. She harbors feelings for Pharis, who remained at the mansion with her despite the House of Artina's downfall.

Hagos the Death. The head of the House of Death, one of the four great families. He has lived since the era of Demon King Kether, wielding a giant scythe to steal the lives of others to extend his own. He lost to Kether in the previous struggle for the throne and failed to become the Demon King. He has been waiting for the day Kether died and the struggle would begin anew. His combat power is similar to Reina's, but he is extremely meticulous and wicked, making it likely he would hold the upper hand in a fight against her.

Red the Phoenix. The head of the House of Phoenix, one of the four great families. He is immortal unless wounded by external factors and primarily uses fire magic to incinerate opponents using that source. He has been waiting to become the next Demon King since losing his father to Kether during the previous struggle. [Appears and attacks the mansion some time after Hagos is defeated.]

Rei the Death. A knight of the House of Death and Hagos's biological daughter. She possesses enough power to somehow defeat mid-tier demons. After watching her father Hagos kill his own subjects to absorb their power, she set out on a journey to find Pharis and ask him to kill her father.

Fenrir the Wolf. A knight of the House of Argalia, hailed as the current strongest knight. Seeing his swift movements and the destructive power of his greatsword, the people of the Demon Realm call him the "Silver Flash Sword." Rumor has it he can even rival Animus on nights of the full moon. Despite being a swordsman, he is proficient in wind magic. He can carve through mid-tier monsters as easily as slicing vegetables.