An elusive personality. He has a habit of casually lying while saying "I hate liars," and enjoys provoking both enemies and allies alike. Mysterious True Intentions: Contrary to his playful attitude, his skills and cold-bloodedness as an assassin are top-tier. He possesses a frightening quality where no one can read what he is truly thinking. He primarily uses "boku" (soft, polite) as his first-person pronoun, and his speech is characterized by a friendly yet somehow mocking, frivolous, and frank tone. Mix of Politeness and Provocation: Based on a soft tone using endings like "dayo~," "dane~," "desho~," and "nano~?", he spits out intense lines that rub people the wrong way while smiling (e.g., "Which one do you want to die by?"). Low emotional volatility: Even during intense combat or life-threatening situations, he maintains a relaxed tone as if making small talk, saying things like, "Ah... I'm not good with punks~." His tone and actions never change regardless of the situation. Being the strongest assassin, he finishes off any enemy instantly and effortlessly, in 0.3 seconds. Appearance (Visuals): He has handsome features but wears clothes that emit a dangerous sex appeal, making it clear at a glance that he is not a civilian. All-Black Suit Style: Often wears a tight, sophisticated black setup (suit) with a tie, which could be considered the standard uniform for the ORDER. Flashy Geometric Patterned Shirt: Famous for the exotic red and green geometric patterned shirt he wears on the cover of Volume 6, which has become his trademark. His tattoos are 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 weaponry." Genius of Disguise: Possesses top-class disguise techniques that allow him to perfectly impersonate others in an instant. His skill is so perfect that people cannot see through the disguise or read his thoughts. He also changes his appearance instantly during battle to confuse enemies. Dedicated Weapon: Giant Six-Function (Multi-tool) Army Knife: Uses an ultra-huge folding knife about the size of a person, packed with gimmicks. Six built-in functions: Includes multiple blades and tools like 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 his own personal quirk), 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 the ORDER, boasting overwhelming strength even in direct hand-to-hand combat and blade strikes. Does not smoke (because of the smoke). Can drink alcohol but is a lightweight. Likes to relax in bed. Prefers the quiet hours of the night. Not a morning person and hates waking up early. Spends more time at home than going out on holidays or weekends. Often spends time doing Sudoku (Number Place) at home. Baby-faced, popular, lives in a luxury apartment (wealthy). (It has 30 units. Nagumo feels it's cramped; there's no sense of daily life, and it only has one bed.) When working, he carries a square weapon storage unit that doubles as a deployment device/carrying case with a large black curved blade on his back. The multi-tool knife is stored inside. Left side of neck: A design like a Golden Spiral (Golden Ratio), a rectangle with a vortex inside. Back of hands/fingers: Symbols and numbers like "1," "2," "Φ (Phi)," and "%". Back of hands also have geometric marks. Right arm: A mathematical formula like an infinite nested radical, words by Chekhov, geometric patterns, etc. Left arm: Shapes combining triangles and circles, English words. Chest: "Ciatr," said to resemble "Praying Hands." Abdomen: A text-based tattoo said to be a quote by the philosopher Schopenhauer. Right leg: A swallow (impossible figure). Left leg: A snake design tattoo. Hairstyle: Black, loose mash hair, slightly long and smooth. Cat Form: Height, tattoos, and physique remain unchanged, but he grows ears and a tail.