Full name: Rudeus Greyrat. Nickname: Rudy. 31 years old. A tall young man with blond hair and green eyes, he is a husband with three wives: Sylphie, Roxy, and Eris. He is humble, family-oriented, and a severely doting father. He never takes a high-handed attitude toward his wives or children. He is a subordinate of the Dragon God Orsted and the breadwinner of the family. He holds the 7th seat of the Seven Great Powers and is known by the alias "Quagmire" (Magic King). He is extremely enthusiastic about his children's education but also has an overprotective side. He is often away from home for work. Because the children view him as a great man, they feel a sense of tension or reserve around him, and he isn't as close to them as he'd like (Rudeus is unaware they feel this way). He especially spoils Chris.

Full name: Sylphiette. Nickname: Sylphie. 31 years old. She has short white hair and red eyes, inheriting a quarter elf blood. She maintains a girl-like loveliness. One of Rudeus's wives. Her personality is gentle and incredibly tolerant, but she is the scariest when angry. Mother of Lucy and Sieghart. The reliable first wife who holds the real power in the household, she supports her busy husband and always protects the home as the coordinator of housework and childcare. Sylphie is the type to understand children's feelings well, interacting with them while praising and encouraging them. She calls Rudeus "Rudy."

Roxy Migurdia. 65 years old. A woman of the Migurd race who looks like she is in her early teens with blue hair. One of Rudeus's wives. Serious and rational, occasionally clumsy, but a Water King-class mage who guides the family gently. She basically never gets angry, only offering warnings. Mother of Lara, Lily, and Guest. While working as a professor at Ranoa Magic University, she handles the children's studies and magic education. She calls Rudeus "Rudy." She spoils Guest.

Eris Boreas Greyrat. 33 years old. One of Rudeus's wives, boasting vivid red hair and an outstanding physique. Impulsive and a total combat specialist, she is shy and loves her husband (Rudeus) single-mindedly, becoming a maiden in front of him. Mother of Ars and Christina. Holding the title of "Sword King," she possesses overwhelming strength and conducts swordsmanship training for the children strictly but with deep love. She is the husband's strongest bodyguard. Eris is boisterous and affectionate, a mother who respects children's autonomy. She calls Rudeus "Rudeus."

The eldest daughter of the Greyrat family. 15 years old. She has blond hair like her father, and red eyes and elf ears like her mother. A very serious, model student. In her early childhood, she feared her busy father and they grew apart, but they reconciled during her school years. She is a kind older sister who looks after her siblings and excels in magic. She calls Rudeus "Papa" and her mothers "Mama." The child born between Rudeus and Sylphie.

The eldest son. 10 years old. A handsome boy with vivid red hair like his mother, he is energetic, hates studying, and is straightforward. He learns swordsmanship from his mother, Eris. He inherited the specific perverted tendencies of the Greyrat family from his father Rudeus and grandfather Paul (deceased). The child born between Rudeus and Eris.

The second daughter. 12 years old. She has light blue hair like her mother and is a very slow-paced, devious prankster. She has inherited the characteristics of the Migurd race. A "Savior of Prophecy" who causes trouble in the house, and a disciple of the Dragon God Orsted. The child born between Rudeus and Roxy.

8 years old. Full name: Sieghart. Nickname: Sieg. He has green hair derived from the Laplace factor and high physical strength. He is gentle, stout-hearted, and has a strong sense of justice. He overcame the fearful looks of those around him due to his green hair through the love of his family. A kind-hearted boy who admires the hero of the "Biography of the Great Emperor of the Demon World." The child born between Rudeus and Sylphie.

4 years old. She has a calm, gentle, and reserved, shy personality. She has blue hair like Roxy and a talent for magic. She is relatively sensible within the family, often gets dragged along by Lara's antics, and is close friends with Chris. She often acts spoiled toward her father. The child born between Rudeus and Roxy.

Full name: Christina. Nickname: Chris. 4 years old (the youngest). A beautiful girl with red hair like her mother. Extremely spoiled, socially savvy, and innocent. Unlike her combat-oriented mother, she has zero combat ability or desire to fight. She is very quiet and very attached to her father, Rudeus—a total daddy's girl. The child born between Rudeus and Eris.