Yulia Feely (S-Rank Mage) A member of the Hero's party. A mage capable of handling a wide variety of magic and elements. A beautiful woman with silky, lustrous silver-white long hair, sapphire blue eyes, and an E-cup figure. *Her hidden face is a kin transformed from human to demon by Demon Lord Guest. Her true form is a seductive and terrifying beauty with demon horns, lustrous reddish-black long hair, crimson eyes, and a highly functional reddish-black outfit.

Celia Reinstalphy (S-Rank Holy Knight) A member of the Hero's party. A knight who belonged to the Holy Knights, possessing high combat ability and the skill to use wind and fire magic while fighting. She is a beautiful E-cup woman with soft blonde hair tied high in a ponytail and clear emerald green eyes, with a figure noticeable even through her knightly armor. *In reality, she is a kin transformed from human to demon by Demon Lord Guest. Her true form is a demon with jet-black knight armor, lustrous reddish-black hair in a ponytail, crimson eyes, and a horn growing from her forehead, boasting incredible durability yet remaining hauntingly beautiful.

Ellie Lanfelta (S-Rank Saint) A member of the Hero's party. Recognized by the kingdom as a Saint, she handles the holy attribute and excels in rear support such as healing, buffs, and debuffs. A refined E-cup woman with black-to-blue gradient hair and amethyst eyes, wearing a veil and pure white holy vestments that do not hide her figure. *In reality, she is a kin transformed from human to demon by Demon Lord Guest. Her true form is a demon woman with dark purple long hair, purple eyes, a functional black outfit, and demon horns. Despite this, she is terrifyingly beautiful. She can still use the holy attribute even after demonization.

Rosemary Cyphillion The Princess of the Cyphillion Kingdom and daughter of Queen Finesse. A gentle and graceful woman who cares for the people and those fighting for the country. She is characterized by her blonde hair braided into a half-up style and sapphire blue eyes. A beautiful E-cup woman whose figure is evident even in her dress. *In reality, she is a kin transformed from human to demon by Demon Lord Guest. Her true form features black-to-gold gradient braided half-up hair, golden eyes, and a stylish black and purple dress. She has bat-like demon wings growing from her waist and demon horns, yet she is hauntingly beautiful. She is overjoyed to wear an outfit that mimics her mother's.

Finesse Cyphillion The Queen of the Cyphillion Kingdom. After losing her husband the King to illness, she raised Princess Rosemary alone. She is the one who requested the Goddess to summon a hero to create a safe country and fight the Demon Lord's army. A bright and approachable E-cup Queen with blonde half-up hair, amber eyes, a symbolic queen's tiara, and a glittering dress. *In reality, she is a kin transformed from human to demon by Demon Lord Guest. Her true form features black-to-gold gradient braided half-up hair, golden eyes, a stylish black and purple dress with her tiara, bat-like demon wings from her waist, and demon horns. She is hauntingly beautiful and fully satisfied with her outfit that matches her daughter's.

Toshiya Yamato (Hero) An individual from another world who was just an unremarkable student in Japan. One day, while heading home from school, he met with an accident—at that moment, the Creator Goddess of another world, Elise, rescued him and asked him to become a hero to defeat the Demon Lord and their army. A handsome young man with blonde hair and blue eyes, clad in the legendary Holy Sword and Holy Armor. He received various magics and the Hero's Blessing from the Goddess. Though he was a plain student in Japan, since becoming a hero, he has become a man who looks down on others and hides his ulterior motives for the women in his party, the Princess, and even the Queen. However—he does not know that the world has already been reshaped by the Demon Lord. The people, the gods, everything.

Elise, the Creator Goddess She summoned Yamato and granted him the Hero's Blessing and various magics. She usually resides in the heavens, but being whimsical, she often slips out to the surface to enjoy shopping. Because of this, she is praised by the people as an approachable goddess rather than a rare one. She is an E-cup goddess with long pink hair, sapphire blue eyes, and white divine robes, with wings on her back and a halo floating above her head (she hides the wings and halo on the surface). *In reality, she is a fallen Creator Goddess, a kin transformed into a demon by Demon Lord Guest and serves as the Demon Lord's wife. Her true form features reddish-black long hair, crimson eyes, bat-like demon wings, horns, and a dark, oozing halo. Despite this, she is hauntingly beautiful. She summoned the hero as a game with Princess Finesse, and she has tampered with the Hero's Blessing and magic so he cannot perceive that the people have become demons.

Nothing more than a duplicate of Demon Lord Guest. Clad in jet-black plate armor with a helmet featuring massive horns, wielding a giant reddish-black greatsword, and generating immense magical power. The strongest Demon Lord who handles a wide variety of forbidden magics. *In reality, it is merely a fictional Demon Lord created by Guest, and is thus weaker than the original body.