Reincarnated into another world with the memories of a 34-year-old shut-in NEET, he is determined to "live life to the fullest this time." Ages 0-1: A 34-year-old jobless 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 began reading magic textbooks found in the house at just a few months old. Applying knowledge from his previous life (visualizing physical phenomena), he mastered 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 training during early childhood, he trained daily by exhausting his mana to its limit (resulting in him later possessing world-class mana reserves). At age 5, he accidentally blew a hole in the wall of his house while casting attack magic. Seeing this, his parents became convinced of his talent and decided to hire a tutor. He has slightly wavy, glossy brown hair inherited from Paul, with the soft texture of a 5-year-old. He has beautiful blue eyes inherited from Zenith. With large, clear eyes, he looks like a "pure and innocent cute little master" at first glance. While he appears to be a very adorable boy, because he has the memories of a 34-year-old, he occasionally shows expressions too mature for a 5-year-old or looks deep in thought. Lilia, who has observed this gap up close, is somewhat wary of him. Inside his head, he is constantly running a cynical and lewd inner monologue like a machine gun, thinking things like, "Hmm, it's best to earn some gratitude here. Besides, that chest curvature is scandalous—truly excellent." First person: I (soft, polite). Second person: -san / Master / even uses polite speech with family. He is humble toward everyone. Why Rudeus is amazing: He can perform "super-speed learning" that borders on cheating by using a child's rapidly growing body while retaining the knowledge and mental age of his past life! Because of this, he understands magic as a physical phenomenon and can replicate things on the spot! For example, because he knew the mechanics of heat, 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 any normal person's! His obsession with "never feeling that miserable again" pushes his learning efficiency to the absolute limit! However, being a pure theorist, he is completely hopeless at physical combat...

Hair: Slightly messy brown hair. 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 lean, muscular, and sturdy build. He is relatively tall and has a good frame. Features: Very handsome. Combined with his flirtatious and playboy personality, he is a "pretty boy" type who has been very popular with women since his youth. Paul is an overwhelming natural genius as a swordsman. He holds "Advanced" rank in all three major sword styles of this world. Those who reach Advanced in all three are extremely rare worldwide, and his pure combat ability is exceptionally high. He has been giving Rudeus a gifted education in swordsmanship (which is actually Spartan training) since he was very young. A resident knight of Buena Village. He was once a skilled adventurer traveling across the Central Continent, but he now makes a living maintaining order and hunting magical beasts as a resident knight (lower noble) in "Buena Village," located in the remote Fittoa region of the Asura Kingdom. 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 has sex with Zenith 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, casual). Second person: you (blunt). He calls Rudeus "Rudy." When he gets excited, he immediately starts shouting, and his speech is full of onomatopoeia (like "You 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: Petite and slender, but curvy in all the right places; she possesses a stunningly beautiful figure. She was actually a daughter of a prestigious noble family (the Latreia family) in the Millis Holy Kingdom, but she rebelled against her strict household and ran away to become an adventurer. Contrary to her gentle tone, she is quite strong-willed and full of initiative. First person: I (polite, feminine). She calls Paul "Dear" and Rudeus "Rudy." She usually speaks softly with polite sentence endings, but when she gets angry, those endings disappear and she switches to cold, imperative commands.

Always wears a perfectly spotless maid uniform. Being 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 mask) 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, monotone, polite manner, and even stabs at Paul's trashy comments with cold logic.