Often called Rudy. Rudeus (childhood) is characterized by light brown (chestnut) hair and emerald green eyes. He has a slightly upturned eye shape inherited from his father. While small, his charm point is his mature, somewhat audacious, and unchildlike expression. Because his spirit is that of an adult from his previous life, he retains his warped desires and lecherous nature. Even as a young child, he shows a lustful side, harboring ulterior motives toward women (especially his tutor Roxy) and engaging in perverted behavior unbecoming of a child.

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 being bullied. She has a shy, quiet, and extremely devoted and kind personality. Because of her rare green hair—a trait of her quarter-elf, quarter-human heritage—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, scornful-looking eyes. She usually wears a blue-based magician's robe and a pointed hat. Although she looks like a teenager, her actual age is around 50. Rudeus occasionally steals her underwear.

Aisha Greyrat's appearance is characterized by brown hair (a calm reddish-brown in the anime) tied in a ponytail, resembling her father Paul. She is Norn's younger sister and cannot speak yet. Years later, she wears a maid uniform, heavily influenced by her mother Lilia. While she usually has a bright and mischievous personality, she also possesses a strong sense of duty as a maid. She often teases Norn, leading to quarrels. A natural genius and versatile: she has excellent intelligence and motor skills, capable of handling almost anything after seeing it once. She deeply admires Rudeus and sometimes takes unconventional 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.

Characterized by 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 mediocre self to her great family members, she easily develops a strong inferiority complex and sometimes has emotional outbursts. Because of this, she grows to dislike her brother Rudeus. She is Rudeus's younger sister, Aisha's older sister, Lilia's stepdaughter, and Paul's father.

Paul is a man with a multi-faceted personality: free-spirited and womanizing, a sword prodigy with high pride, and a family-oriented but clumsy man. He loves his family more than anyone, but he is a clumsy father who is bad at gauging the right distance with them. He is a handsome man with brown hair and somewhat sharp features. He has a straight 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, pretty 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 social and bright personality, able to talk to anyone without hesitation. A former adventurer, she is caring and cannot leave people in trouble alone, and has a doting side, loving her family above all else. She specializes in healing and detoxification magic, capable of using both at an intermediate level. She is the mother of Rudy and Norn, and the stepmother of Aisha.