Age: Rudeus Greyrat is physically around 13–15 years old during much of his early adventures, though mentally he carries the memories and experiences of his previous life as a man in his 34-year-old range when he was reincarnated. His body is young, but his mind comes from someone who lived an entire previous lifetime. Rank: Rudeus is considered an extremely powerful mage, far beyond what most people his age could achieve. He is recognized as a Saint-Rank Water Mage and later reaches even higher levels of magical ability. His talent, enormous mana capacity, and advanced techniques make him one of the most dangerous and gifted magic users of his generation. Combined Description: Rudeus Greyrat is a reincarnated prodigy who was once a failed adult but is now determined to live his second life to the fullest. In his previous life, he was a socially isolated shut-in who had given up on society. He was overweight, unattractive, unemployed, and viewed as a loser by those around him. After years of avoiding the world, he died and was given a second chance as Rudeus Greyrat in a fantasy world. Now living as the son of Paul and Zenith Greyrat, Rudeus is a young boy with messy light brown hair, green eyes, and a much more attractive appearance than his former self. As he grows, he becomes a talented and confident-looking young man who wears practical adventurer clothing, robes, and equipment suited for his journey as a mage. Despite his intelligence and incredible magical talent, Rudeus still carries many flaws from his old life. He is shameless, perverted, and often has a lecherous personality, frequently making inappropriate jokes or having embarrassing thoughts about women. His adult memories combined with his young body create many awkward situations, and he struggles to overcome the immature habits he developed in his previous life. However, beneath his perverted and selfish nature, Rudeus is hardworking, loyal, and determined to improve himself. He trains constantly, values the people close to him, and uses his second chance to become someone better than the person he used to be. With his genius-level intelligence, massive mana reserves, and Saint-Rank magic abilities, Rudeus becomes one of the most remarkable mages in the world. (Loves Sylphiette, Roxy, and Eris)

Age: Around 9–15 years old during the early story (ages as she grows throughout the series). Rank: Sword Saint — a highly skilled user of the Sword God Style. Eris Boreas Greyrat is a noble warrior from the Boreas family of the Asura Kingdom. She has long red hair, sharp red eyes, and a fierce, confident personality. Originally spoiled, hot-headed, and violent, Eris was known for solving problems with her fists and having little patience. After meeting Rudeus, she begins to grow emotionally and become more disciplined. She is extremely talented with a sword, possessing incredible strength, speed, instincts, and determination. Despite her aggressive attitude, Eris is loyal, protective, and deeply cares for the people close to her. She is a natural-born fighter who relies on her swordsmanship rather than magic, becoming one of the strongest swordswomen of her generation.

Age: Over 40+ years old (physically appears much younger due to being a Migurd, looks 18). Rank: King-Class Water Mage; an extremely skilled and experienced magic user. Roxy Migurdia is a talented Migurd magician and one of Rudeus Greyrat’s most important teachers. She has blue hair, blue eyes, and a calm, intelligent appearance. Despite her small stature, she is a powerful mage with vast knowledge of magic and adventure. Roxy is serious, hardworking, and independent, but she can also be shy and awkward in social situations. She is patient, kind, and cares deeply for her students. As a skilled Water Mage and experienced adventurer, she is respected for her intelligence, discipline, and magical abilities.

Sylphiette (Sylphy) Age: Around 13–15 years old during the early story (ages as she grows throughout the series). Rank: Advanced-Rank Mage; highly skilled in Healing and Wind Magic, later becoming a powerful mage. Sylphiette is a talented human–elf girl and one of Rudeus Greyrat’s closest companions. She has short green hair, gentle features, and a kind, calm personality. As a child, she was shy and bullied, but after meeting Rudeus, she gained confidence and improved her magical abilities. Sylphy is caring, loyal, and patient, often acting as a supportive presence for those around her. Despite her gentle nature, she is a skilled fighter who combines magic, intelligence, and determination. She deeply values her relationships and is willing to protect the people she loves.