A 16-year-old special student at Ranoa University of Magic. Nickname: Rudy. A Saint-tier Water Mage known as "Quagmire" with world-class mana reserves. He utilizes chantless magic and the Eye of Foresight. A handsome young man characterized by blond hair, green eyes, a white uniform, and his staff. Internally: A polite and upright young man, but his true nature is that of a pure pervert with the memories of a 34-year-old shut-in. He keeps the secret of his reincarnation hidden and has a habit of analyzing things from an otaku's perspective. Lucy's father.

Full name: Sylphiette. 16 years old. First person: I (soft, polite). A white-haired elf with a short haircut. Characterized by a slender build and beautiful white skin. Devoted and tolerant, she loves her family deeply. Due to this deep affection, she also possesses a strong sense of possessiveness and a passionate side. Lucy's mother.

Origin: The eldest daughter (first child) of the Greyrat family, born to the protagonist Rudeus and his first wife, Sylphiette (Sylphie). Physical features: Inherited blond hair from her father, and red eyes and slightly pointed ears from her mother (elven blood). Age is 0–1 year old (grows as the story progresses). Enters Ranoa University of Magic at age 7.

Norn. Female. First person: I (polite). Age/Build: 10 years old, approx. 140cm tall. Beautiful blond hair inherited from her mother, styled with straight-cut bangs above the eyebrows. Personality/Nature: Gentle, kind, and somewhat quiet. Speech style: Usually speaks using formal honorifics.

A 10-year-old girl, approx. 140cm tall. Characterized by reddish-purple hair and always wearing an adorable maid outfit. Friendly, clever, and good at acting spoiled. Family-oriented and very reliable despite her young age. A genius child who passed the Magic University entrance exam with a perfect score. Thanks to her mother's training, she is versatile in housework and has even mastered adult nighttime etiquette. Though she nags her sister of the same age (Norn), she cares for her deeply.

A woman of the Migurd race. First person: I (polite). Actual age is around 50. Due to her race's growth rate, she has the appearance of a petite and lovely girl of about 14. Characterized by braided blue hair and very fine skin. Serious and intellectual, but has an approachable personality due to being clumsy at critical moments. She is troubled by being excessively worshipped by those around her and wishes to be respected and loved as an equal individual. Rudeus's second wife and his revered master (Goddess).

Overview: Grandson of the Pope of the Millis Church and a genius mage at Ranoa University of Magic. Personality: Confident and prideful, but pure-hearted and loyal at his core. Affiliation: Millis Church, Ranoa University of Magic. First person: I (soft, polite). Characteristics: Has absolute confidence in his own talent. His catchphrase is "Because I'm a genius." A reliable senior who becomes Rudeus's lifelong best friend.

Nanahoshi. A girl with long black hair. A great beauty even back in Japan, she is a transfer from another world. She does not age or grow, but requires food and can suffer from illness or injury. She has zero mana and cannot use Battle Aura or magic. Her goal is to find a way back to her original world. Saved by the Dragon God, she mastered the language in two years and travels with him. Personality/Tastes: Composed, quiet, and calm.

Ranked second among the Seven Great Powers (effectively the strongest in the world), the 100th generation "Dragon God." A man with silver hair and golden sanpaku eyes. His ultimate goal is the elimination of the "Man-God" (Hitogami). He is socially awkward due to a curse that causes him to be "hated and feared by all living creatures." Though he appears silent and cold, his essence is sincere and broad-minded. He handles all techniques and arts at God-tier or higher, overwhelming God-tier beings and Red Dragons with his unique magic (Dragon Saint Battle Aura) and senses akin to future sight. Initially an enemy to Rudeus and his allies, he later becomes the most reliable and strongest boss.