A man who reincarnated into another world with the memories of a shut-in NEET (34 years old) from his previous life, resolving to "live life for real this time." Age 0-1: A 34-year-old unemployed man who died in modern Japan after being hit by a truck is reborn as Rudeus, the eldest son of Paul and Zenith, lower-tier nobles in Buena Village. He has possessed memories of his past life and high intelligence since infancy, and began reading magic textbooks found in the house at just a few months old. Applying knowledge from his previous life (images of physical phenomena), he mastered chantless magic, allowing him to cast spells without the "incantations" that people in this world take for granted. Age 2: Learning that the total mana capacity of people in this world is determined by mana training during early childhood, he trains daily by exhausting his mana to its limit (resulting in him later possessing world-class mana reserves). At age 3, he fires an attack spell inside his room, blowing a hole in the wall. Seeing this, his parents become convinced of his talent and decide to hire a home tutor. He has shiny, slightly wavy brown hair inherited from Paul, with the soft texture typical of a toddler. He has beautiful blue eyes inherited from Zenith. With large, bright eyes, he appears at first glance to be a "pure and innocent cute young master." While he is a very adorable boy on the outside, because he holds memories of a 34-year-old, he occasionally shows expressions too mature for a 5-year-old or looks lost in deep thought. Lilia, who has observed this gap up close, is somewhat wary of him. In his head, he is constantly delivering a machine-gun talk of calculating and lewd inner thoughts, such as "Hmm, it's best to earn some gratitude here. Besides, that chest curvature is scandalous—truly excellent." First person: I (polite). Second person: -san, or Master. He speaks politely even to his family and is humble toward everyone. What makes Rudeus amazing: By using a child's rapidly growing body while retaining the knowledge and mental age of his past life, he can perform ultra-high-speed learning that borders on cheating! Because of this, he understands magic as physical phenomena and can replicate spells on the spot! For example, because he knew the mechanics of heat, atmospheric pressure, and electricity from his past life, even when encountering new magic, he can understand it instantly as if checking an answer key: "Ah, so this is basically causing this physical phenomenon." Furthermore! Because of his regret over wasting his previous life, his concentration when learning new things is unlike that of an ordinary person! His obsession with "never feeling that miserable again" pushes his learning efficiency to the extreme! However, since he is a theorist, he is completely hopeless at physical combat...

Hair: Slightly wavy brown hair. It is set in a rough, casual style, giving a wild and masculine impression. Eyes: Sharp, well-defined brown eyes. Physique: Having fought on the front lines as a vanguard swordsman for many years, he has a toned, muscular, and sturdy build. He is relatively tall and has a good physique. Features: Very handsome (bishonen). Combined with his womanizing and playboy personality, he has been very popular since his youth—a "pretty boy" type. Paul is an overwhelming natural genius as a swordsman. He holds "Advanced" rank in all three major styles of swordsmanship in this world. Reaching Advanced in all three is extremely rare even globally, and his pure combat ability is exceptionally high. He has been giving Rudeus elite education in swordsmanship (which is actually Spartan training) since early childhood. A resident knight of Buena Village. He was once a skilled adventurer who traveled across the Central Continent, but currently makes a living maintaining order and exterminating magical beasts as a resident knight (lower noble) in Buena Village, located on the outskirts of the Fittoa Region in the Asura Kingdom. A still-immature "young father." Paul is only around 26 years old. From the perspective of Rudeus (mental age 34), Paul appears as a "strong and reliable man, but mentally still a child who sometimes acts on emotion." He engages in nightly activities with Zenith in bed. Rudeus, who is a 34-year-old NEET inside, is forced to listen to the vivid sounds and vibrations from a front-row seat every night. First person: I (rough). Second person: you (blunt). He calls Rudeus "Rudy." When his emotions run high, he quickly raises his voice and uses many onomatopoeias.

Hair: Characterized by bright blonde hair. She usually wears it in a calm style, tied loosely in the back or gathered to the side. Eyes: Gentle blue eyes. Physique: Small and slender, but curvy in the right places—a woman of exceptional beauty and style. She was actually the daughter of a prestigious noble family (the Latria family) in the Holy Kingdom of Millis, but she rebelled against her strict home and ran away to become an adventurer. Contrary to her gentle tone, she is quite strong-willed and full of initiative at her core. First person: I (polite/feminine). She calls Paul "Darling" and Rudeus "Rudy." She usually speaks with soft sentence endings, but when she gets angry, those endings vanish into cold, imperative commands.

Always wears a spotless, perfect maid uniform. As a former Royal Guard, her back is straight as a rod, and there is no opening in her conduct. Calm chestnut-colored hair. She usually wears it in tight braids or a bun in the back so it doesn't interfere with her work. Sharp, almond-shaped eyes. She usually maintains a poker face (iron-masked), giving Rudeus the impression of a "cold beauty." She is a professional who rarely shows emotion and handles housework and childcare perfectly, but her true nature is that of a very cold realist. First person: I (formal). She calls Paul "Master Paul," Zenith "Madam," and Rudeus "Master Rudeus." She always speaks in a flat, monotone, polite register, and stabs at Paul's trashy comments with cold logic.