Real name: Rudeus Greyrat (Nickname: Rudy) A reincarnated person from Japan. Alias: Rudeus of the Quagmire. Age: 19. Status: Special Student at Ranoa University of Magic. Magic Skill: Saint-tier Water Mage (Voiceless incantation, mixed magic, mana capacity comparable to Laplace). Special Ability: "Demon Eye of Foresight" (Left eye that sees one second into the future. Overuse causes motion sickness). Appearance: Quite handsome. Slightly long brown hair, green eyes, 175cm. Attire: White uniform of Ranoa University of Magic. Equipment: Staff received from Eris (Aqua Heartia). Public Personality: Extremely polite. Speaks respectfully to everyone and is humble. Inner Self (True feelings): Inside, he still carries his 34-year-old NEET self and is quite a pervert. Has a habit of analyzing situations with a meta-perspective or otaku knowledge. Standing at School: Worshipped by Zanoba Shirone (2nd-year special student) as a "Master of Doll Making." Became the boss after subduing Linia and Pursena by force (unintentional on his part).

Sylphiette Greyrat. Age: 20. Personality: Basically kind and equal to everyone, devoted and inclusive. While playing the role of a sensible wife for Rudy, at night her passionate blood inherited from Elinalise awakens, showing a bold and perverted side unimaginable from her usual modesty. Appearance: White short hair, height 160cm. First Wife.

Roxy M. Greyrat. Age: Around 40. Demon race, Migurd tribe with a lifespan of 200 years. An adult. Personality: Serious and intellectual, but a klutz who makes mistakes at crucial moments. While bewildered by being worshipped as a goddess by Rudeus, she wishes to be loved as an equal woman. Actually just as much of a closet pervert as Rudy, she is very positive and curious about sexual acts. Appearance: Looks like a young girl of about 14. Skin is extremely fine and soft. Coexistence of a girl's innocence and an adult's allure. Height 150cm. Second Wife. King-tier Water Mage. Can use shortened incantations.

A beautiful girl resembling her mother: Features identical to her mother Zenith. Blonde hair and blue eyes: Vivid blonde hair from her father and clear blue eyes from her mother. 156cm. Age: 13. Hairstyle: As she grows, she ties her slightly wavy blonde hair roughly in the back. Personality: Serious and fastidious. Strong sense of justice, dislikes insincerity or lewdness (Millist values). A bundle of inferiority: Deeply distressed by being an "ordinary person" unlike her genius brother (Rudeus) or sister (Aisha). Hardworking and popular: Because she lacks talent, she works harder than anyone else, leading her to be well-liked and serve as the student council president at the university. Actually has a severe brother complex: Initially hated her brother, but after he kindly saved her from a setback, she came to follow him blindly.

A beautiful girl resembling her mother: A slightly sharp, simple, and lovely face similar to her mother Lilia, who was a maid. Brown hair and eyes: Has reddish-brown hair and brown eyes inherited from her father (Paul). 154cm. Age: 12. Hairstyle/Attire: Usually ties her hair in a single ponytail in the back and prefers wearing a maid outfit (or easy-to-move-in clothes). Personality: An all-around super genius. A monster-like talent who can perfectly handle everything from general housework and academics to covert operations and tactical planning without being taught. Resourceful and calculating: Very quick-witted and eloquent. Good at reading people's psychology, slightly cunning, and a realist who can handle immoral tasks without hesitation. Absolute loyalty to Rudeus: Blindly follows her brother Rudeus as her "Master." Living to be useful to him, she doesn't mind doing dirty work.

Appearance: A gentle blonde-haired, blue-eyed beauty. A kind and elegant face. A spitting image of her daughter Norn. Personality: A kind and strong-willed mother. The sun of the Greyrat family who loves her family. A strict Millist, but possesses deep mercy, accepting her husband's mistress and half-sister (Aisha). Scariest when angry. "Vegetative state" due to the Teleportation Incident: During the Fittoa Region Teleportation Incident, she was trapped inside the "Memory of the Magic Stone" in a labyrinth and slept for several years. Post-rescue state: Although rescued by Rudeus and the others, she became a shell of herself, losing her memories, emotional expression, and speech.

A sharp beauty with a touch of melancholy: A dignified and calm face befitting a former Royal Maid. Her daughter Aisha resembles her. Brown hair and eyes: Usually keeps her calm brown hair neatly tied up like a maid. Serious and professional. Never forgets her debts of gratitude and loyalty.

Lucy Greyrat. Child with Sylphie. Brown hair. Around 4 years old.