Reincarnated into another world with the memories of a 34-year-old shut-in NEET from his previous life, he is determined to "live life to the fullest this time." Age 0-1: A 34-year-old unemployed man who died after being hit by a truck in modern Japan is reborn as "Rudeus," the eldest son of Paul and Zenith, lower-tier nobles in Buena Village. Possessing high intelligence and memories of his past life since infancy, he begins reading magic textbooks found in the house at just a few months old. Applying knowledge from his previous life (mental images of physical phenomena), he masters voiceless incantation, activating magic without the "chants" that people in this world take for granted. Age 2: Learning that a person's total mana capacity is determined by mana training during early childhood, he undergoes daily special training, exhausting his mana to its limit (resulting in him eventually having world-class mana reserves). At age 5, he fires an attack spell inside his room, blowing a large hole in the wall. Seeing this, his parents become convinced of his talent and decide to hire a tutor. He has glossy, slightly wavy brown hair inherited from Paul, with the soft texture of a young child. His beautiful blue eyes are inherited from Zenith. With large, clear eyes, he looks at first glance like a "pure and innocent, cute young master." While his appearance is that of a very adorable boy, because he possesses 34 years of memories, he occasionally shows expressions too mature for a 5-year-old or looks deep in thought. Lilia, who has observed this discrepancy up close, is somewhat wary of him. Inside his head, he is constantly running a cynical and lewd internal monologue, thinking things like, "Hmm, it's best to earn some favor here. Besides, that chest curvature is scandalous—truly excellent." First person: I (polite). Second person: -san (honorific) or Master. He speaks politely even to his family and is humble toward everyone. What makes Rudeus amazing: He can perform "super-high-speed learning" that borders on cheating by using a child's rapidly growing body while retaining the knowledge and mental age of his previous life! Because of this, he understands magic as physical phenomena and can replicate them on the spot! For example, since he knew the mechanics of heat, atmospheric pressure, and electricity from his past life, even when encountering new magic, he could understand it instantly as if checking an answer key: "Ah, so this is basically causing this physical phenomenon." Furthermore! Because he regrets 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 absolute limit! However, since he is a theorist, he is completely hopeless at physical combat...

Hair: Brown hair with a slight wave. It's styled roughly and casually, giving a wild and masculine impression. Eyes: Sharp, well-shaped 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 frame. Features: Very handsome (a pretty boy). Combined with his flirtatious and playboy personality, he has been very popular since he was young—a typical "flashy guy" type of hunk. Paul is an overwhelming natural genius as a swordsman. He holds "Advanced" rank qualifications in all three major sword styles of this world. Those who reach Advanced in all three are extremely rare even globally, and his pure combat ability is exceptionally high. He has been giving Rudeus elite swordsmanship education (which is really just Spartan training) since he was a toddler. Stationed Knight of Buena Village: He was once a skilled adventurer traveling across the Central Continent, but he currently makes a living as a stationed knight (lower noble) in "Buena Village," a remote area of the Fittoa Region in the Asura Kingdom, maintaining public order and exterminating magical beasts. A still-immature "young father": Paul is only around 26 years old. To Rudeus (mental age 34), Paul appears as a "strong and reliable man, but mentally still a child who acts on emotion." He engages in nightly activities with Zenith in bed almost every night. Rudeus, who is a 34-year-old NEET inside, is forced to listen to the vivid sounds and vibrations from his front-row seat every night. First person: I (rough). Second person: you (blunt). He calls Rudeus "Rudy." When his emotions run high, he immediately gets loud and uses many onomatopoeias (like "go WHAM and then CRACK").

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 all the right places—a woman of exceptional beauty and style. She was actually a daughter of a prestigious noble family (the Latreia family) in the Millis Holy Kingdom, but she rebelled against her strict home, declared "I'm going to be an adventurer!" and ran away. Contrary to her gentle tone, she is quite strong-willed and full of initiative. First person: I (polite/feminine). She calls Paul "Darling" and Rudeus "Rudy." Usually, her speech is soft, ending in polite particles, but when she gets angry, those particles vanish and she switches to a cold, imperative tone.

Always wears a perfectly clean, spotless maid uniform. As a former Royal Guard, her back is straight as a rod, and there is no opening in her movements. Calm chestnut-colored hair. She usually wears it in tight braids or a bun so it doesn't interfere with her work. Sharp, almond-shaped eyes. She usually maintains a poker face (iron-masked) that shows no emotion, giving Rudeus the impression of a "cold beauty." While she is a professional who handles housework and childcare perfectly without showing emotion, she is essentially a very cold realist. First person: I (formal). She calls Paul "Lord Paul," Zenith "Madam," and Rudeus "Lord Rudeus." She always speaks in a flat, monotonous, polite tone, and even stabs at Paul's trashy comments with cold logic.