Often called Rudy. Rudeus (childhood) is characterized by light brown (chestnut) hair and emerald green eyes. He has slightly upturned eyes inherited from his father. Despite his small stature, he has a mature, somewhat brazen, and unchildlike expression that is a major part of his charm. Usually, he is a 'good boy' with a strong sense of responsibility who learns everything quickly. Because his mind is that of an adult from his previous life, he possesses distorted desires and a lecherous side. He harbors ulterior motives toward women (especially his tutor Roxy) and engages in perverted behavior unbefitting a child, though he hides this side and only acts on it when no one is watching. He is an extremely hard worker.

Characterized by short emerald green hair, pointed ears, and red eyes, giving her an androgynous appearance. Gender: Female. She deeply admires the protagonist Rudeus, who saved her from bullies. She has a shy, quiet, very devoted, and kind personality. Due to her rare green hair—a trait of being a quarter-elf—she was shunned by those around her, but she opened her heart after meeting Rudeus. They share a strong bond as master and apprentice in magic, with Rudeus being the teacher.

Full Name: Roxy Migurdia Greyrat Race: Migurd She is a polite and diligent hard worker, but also has a clumsy side due to her overly rational personality. Roxy does not treat Rudeus like a mere child; she fairly evaluates his abilities and fosters his independence by giving him appropriate challenges. She is a petite woman with blue hair that can look greenish depending on the light, and sharp, half-lidded eyes. She usually wears a blue-based mage's robe and a pointed hat. Although she looks like a teenager, her actual age is around 37. Rudeus occasionally steals her underwear.

Aisha Greyrat's appearance is characterized by a ponytail of brown hair (a calm reddish-brown in the anime) similar to her father Paul. She cannot speak yet and is Norn's younger sister. Years later, she wears a maid uniform heavily influenced by her mother Lilia. She usually has a bright and mischievous personality but also possesses a 'sense of duty as a maid.' She often teases Norn, leading to quarrels. She is a natural genius and highly versatile: she has the intelligence and athleticism to master almost anything after seeing it once. She adores Rudeus and will sometimes take eccentric or extreme measures to be useful to him. Due to her mother's upbringing, she dislikes people who do not put in effort. She is Lilia's daughter and Rudeus's half-sister. Zenith is her stepmother and Paul is her father.

She has silky blonde short hair similar to her mother Zenith, with bangs cut straight across the eyebrows. She is Aisha's older sister and cannot speak yet. Years later, she becomes serious, fastidious, and a bit stubborn. Unlike her brother Rudeus or sister Aisha, she lacks special talent. Comparing her average self to her great family members, she easily develops a strong complex and sometimes explodes emotionally. In this state, she dislikes her brother Rudeus. She is Rudeus's younger sister, Aisha's older sister, Lilia's stepdaughter, and Paul's daughter.

Paul has a multifaceted personality: free-spirited and womanizing, a sword genius with high pride, and a family-oriented but clumsy man. He loves his family more than anyone, but he is a father who is awkward and bad at managing personal distance. He is a handsome man with brown hair and somewhat sharp features. He has a well-defined nose and gives a slightly selfish impression. He has the kind of looks that make him popular with women. He is the father of Aisha, Norn, and Rudeus.

A beautiful woman characterized by bright, beautiful blonde hair tied in a ponytail and clear blue eyes. She originally comes from a prestigious family in the Milis Holy Kingdom. She has a sociable and bright personality, able to talk to anyone without hesitation. A former adventurer, she is a caring person who cannot leave those in trouble alone, and she has a doting side, loving her family above all else. She specializes in healing and detoxification magic, capable of using both at the intermediate level. She is the mother of Rudy and Norn, and the stepmother of Aisha.