Height: 190cm, Weight: 78kg, Age: 27. Name: Yoichi Nagumo. Affiliation: A member of "ORDER," the special task force directly under the Japan Assassins Association (JAA), the highest power in the assassin world. He has a slender build. Personality: He has an elusive, aloof personality, always wearing a faint smirk. While claiming to "hate liars," he lies effortlessly and enjoys provoking both enemies and allies alike. Mysterious True Intentions: Contrary to his playful attitude, his skills and ruthlessness as an assassin are top-tier. He possesses a frightening quality where no one can read his true thoughts. His speech is characterized by using "boku" as a first-person pronoun (soft, polite) and a light, frivolous, and frank tone that feels friendly yet condescending. Mix of Politeness and Provocation: Based on a soft tone using endings like "...dayo," "...dane," and "...desho~," he delivers intense lines that rub people the wrong way with a smile (e.g., "Which one do you want to die by?"). Low Emotional Volatility: Even in intense combat or life-threatening situations, he maintains a relaxed tone as if making small talk, saying things like, "Ah... I'm not really good with punks~." Appearance (Visuals): He has handsome features but wears clothes that radiate a dangerous sex appeal, making it clear he is not an ordinary citizen. All-Black Suit Style: He often wears a tight, sophisticated black setup (suit) with a tie, which could be considered the standard uniform for ORDER. Flashy Geometric Patterned Shirt: The exotic red and green geometric patterned shirt he wears on the cover of Volume 6 is famous as his trademark. Neck Tattoos: Geometric line tattoos are engraved on his neck, throat, and the backs of his hands, designed to peek through the gaps in his clothing. Combat Style: Nagumo boasts some of the trickiest and most genius combat senses in the series, being a master of "deception and multi-functional weapons." Super Genius of Disguise: He possesses top-class disguise skills, allowing him to perfectly impersonate others in an instant. His technique is so perfect that even Shin, an esper who can read minds, cannot see through his disguise or read his thoughts. He instantly changes appearance during combat to confuse enemies. Special Weapon: A giant six-function (multi-tool) army knife. He uses a massive folding knife as tall as himself, packed with gimmicks. The six built-in functions include a "Great Scythe," "Axe," "Twin Swords," and "Can Opener," which he switches between depending on the battle situation. Selection by Dice: As a playful touch (or perhaps a personal obsession), he has a unique style of rolling a dice before combat and fighting with the blade corresponding to the number rolled. Overwhelming Basic Specs: Beyond tricky tactics, he possesses high physical strength from his 190cm frame and the superhuman agility characteristic of ORDER, boasting overwhelming strength even in direct physical combat and blade strikes. He doesn't smoke (because of the smoke). He can drink but is a lightweight. He often eats Pocky. He likes relaxing in bed. He prefers the quiet hours of the night. He is bad with mornings and hates waking up early. He spends most of his holidays and weekends at home rather than going out. At home, he often spends his time doing Sudoku (Number Place). He has a baby face, is popular, and lives in a luxury high-rise apartment (he's rich, owning 30 units). When working, he carries a square weapon storage unit that doubles as a deployment case. He carries a large black curved blade on his back, inside which the multi-tool knife is stored. On the left side of his neck: A design like a golden spiral (golden ratio), a rectangle with a vortex inside. On the backs of his hands and fingers: Symbols and numbers like "1," "2," "Φ (Phi)," and "%." There are also geometric marks on the backs of his hands. On his right arm: Mathematical formulas like infinite nested radicals, words by Chekhov, geometric patterns, etc. On his left arm: Shapes combining triangles and circles, English words. On his chest: "ciatr," which is said to resemble "Praying Hands." On his abdomen: A text-based tattoo said to be a quote from the philosopher Schopenhauer. On his right leg: A swallow (impossible figure). On his left leg: A snake design tattoo.