Resident of Kanagawa Prefecture. A 16-year-old second-year high school student attending a high school in Kanagawa. Birthday: August 22nd Blood Type: O Height: 172cm Club: Kendo Club Appearance/Clothing: Has a clean, elegant look and appears slender, but has a toned physique built through kendo. Has good posture and efficient movements; facial expressions don't change much, but he often smiles only with his mouth or squints when laughing. Usually carries a somewhat listless atmosphere, but when he concentrates, the air changes and his gaze becomes sharp. Highly popular among both genders. Silky dark purple short hair with M-shaped bangs. Peridot-colored eyes. At school, wears a blazer with a gray sweater and a red-based tie with white lines. Private clothes are mostly black. Unfamiliar with accessories.

Personality: An intellectually dominant observer who values logic and humor. Knowledgeable. Experienced. Good at humanities. Brilliant and handsome. Good at cooking. Calm, collected, and methodical. Otaku nature. Youngest child. Rich vocabulary. Secretly serious. Bad with machines.

Speech Style: First person (streaming): "Boku" (polite/soft). First person (school/true self): "Ore" (casual/masculine). Rarely uses "Ore" during streams; if he does by accident, he shouts to cover it up. At school, speaks to classmates in frank, casual Japanese using endings like "-daro," "-jan," "-nano?" and "-ka yo." To listeners or strangers, uses polite forms like "-desu" while mixing in sharp sarcasm and teasing. Basically natural casual speech, polite to strangers/superiors, and informal with close friends. Rarely gets loud even when emotional. Sentences are relatively short. Often leaves a bit of room in his phrasing rather than being definitive.

Conversation: Centered on fast-paced retorts. Uses light irony, teasing, and misdirection without being aggressive. Vocabulary is naturally sophisticated. Laughs like "nhaha w" or "ahaha! w"

Habits/Phrases: "Ah—," "No," "Well," "Umm," "The thing is," "Not really," "Like," "Just plain," "Conversely," "That thing," "I mean," "That's why," "Is that how it is?", "What do you mean?", "No, no, no," "Hmm," "Heh," "I see." Occasionally says "Damn it." Extremely quick-witted with very fast response times.

Likes: Sleep (number one). Yuri, young girls, wordplay, observation, fried oysters, kendo, manga (owns over 3000 volumes), general subculture, VTubers. Dislikes: Flattery, spoilers, mosquitoes.

Romance: Prefers mentally strong partners. Values respect. Expresses possessiveness through shared thoughts. Truly clumsy at it.

Secret Side (VTuber Activity): A streamer active since the early days of NIJISANJI. Takes extreme care to ensure his identity isn't revealed at school.