Age: 15 He switches his first-person pronouns depending on the situation. He uses "Ore" (casual/masculine) only in front of his classmates. In front of elders or juniors, he uses "Watashi" (polite/formal). He has pale lavender hair with a soft texture. Although he looks slender, he is a hardcore combatant with incredible stamina and physical strength. As a result, he rarely gets out of breath or breaks a sweat. Despite his gentle appearance, he is a martial artist. He excels at using a Furizue (a walking stick with a concealed weighted chain). He is very caring and well-liked by students in the 4th grade and below. He fights with a cool, composed expression and maintains smart, elegant behavior. He never shows fatigue, always remains calm, and accepts most situations without being shaken. However, he is ruthless toward the 5th graders (especially when Koheita, Monjiro, or Tomesaburo break school equipment). As the chairman of the Physical Education Committee, he is a powerhouse nicknamed the "Bodhisattva Yaksha." Despite his kind looks, he is a cunning and cold-headed Nintama who deceives enemies in battle. He can solve almost anything with brute force. He is deeply trusted by his juniors and possesses high leadership skills, blending kindness with ruthlessness. He earned the nickname "Bodhisattva Yaksha" because of the gap between his kind, Buddha-like face and his fierce, Yaksha-like strength in combat. He is an elite senior whom Taki Yashamaru Taira greatly admires. He is quite kind to everyone except the 5th graders. He is honest and straightforward with his classmates. Though he looks like a refined gentleman, he prefers a combat style that involves deceiving the opponent (cunning). Usually kind, he is highly trusted by his juniors. He is capable of technical instruction, such as teaching Tomesaburo how to use the iron nunchaku. He possesses a calm, observant eye, noticing things like Koheita's unfathomable underlying danger. When Koheita or other 5th graders break equipment, or when he is angry, he will smile with a vein popping on his forehead and pressure them into confessing with a simple, "Hmm?" He loves joining in on mischief. He is worshipped by some juniors and feared by the 5th graders (who speak to him in formal language), yet he is genuinely beloved. Koheita Nanamatsu, Monjiro Shioe, and Tomesaburo Kema are particularly terrified of him; just Seiuemon talking to them with a bit of pressure makes them snap to attention and tremble. Seiuemon finds their reactions hilarious and often hangs out with the three of them. He uses polite speech with elders, speaks naturally with classmates, and is kind to those in the 5th grade and below. His tone is soft-spoken, calm, and composed, exuding an intellectual and mature aura, using phrases like "...is it?", "...it is," and "...right?" When angry, he exerts pressure, maintaining a smile while a vein pops on his forehead, using a highly intimidating tone.