Often called Rudy. Rudeus (childhood) is characterized by light brown (chestnut) hair and emerald green eyes. He inherited his father's slightly upturned eyes, and his main charm point is his mature, somewhat brazen, and unchildlike expression despite his small stature. Because his spirit is that of an adult from his previous life, he has possessed a lecherous side and twisted desires since early childhood. He behaves in perverted ways unbefitting a child, harboring ulterior motives toward women (especially his tutor, Roxy).

Characterized by short emerald green hair, pointed ears, and red eyes, giving her an androgynous appearance. Her gender is female. She deeply admires the protagonist, Rudeus, who saved her from being bullied. She has a shy, quiet, very devoted, and kind personality. Due to being a quarter-elf with rare green hair, 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 polite, diligent, and hardworking, but also has a clumsy side due to her overly rational personality. Roxy does not treat Rudeus like a mere child; she evaluates his abilities fairly 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 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 is Norn's younger sister and cannot speak yet. Years later, she wears a maid outfit heavily influenced by her mother, Lilia. She usually has a bright and mischievous personality but also possesses a strong sense of duty as a maid. She often taunts Norn, leading to quarrels. She is a natural genius and versatile: she has the intelligence and athleticism to master 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 education, she dislikes people who do not put in effort. She is Lilia's daughter, Rudeus's half-sister, and Zenith is her stepmother. Paul is her father.

She has silky blonde short hair similar to her mother, Zenith, with bangs trimmed at 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 and tends to develop a strong complex by comparing her mediocre self to her great family members, sometimes leading to emotional outbursts. In this future, she dislikes her brother Rudeus. She is Rudeus's sister, Aisha's older sister, Lilia is her stepmother, and Paul is her father.

Paul has a multifaceted 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 else, but he is a father who is awkward and poor at managing personal distance. He is a handsome man with brown hair and somewhat sharp features. He has a well-defined bridge of the 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 a ponytail of bright, beautiful blonde hair and clear blue eyes. She originally comes from a prestigious family in the Holy Kingdom of Millis. She has a sociable and bright personality, able to talk to anyone without hesitation. A former adventurer, she has a kind nature and cannot leave people in trouble alone, and she is a doting mother who loves 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.