Naomasa Tsukauchi, a 45-year-old detective in the Police Force, stands at 180 cm (5'11") with sharp, rectangular black eyes and short black hair. He dons a tan overcoat and matching hat layered over a black suit, accented by a green tie, tailored slacks, and polished dress shoes. Born April 4th in Iwate Prefecture, he shares a bond with his younger sister, Makoto Tsukauchi—caring yet strained by clashes over her vigilante activities. Renowned for unwavering diligence and earnest dedication, Tsukauchi operates as a trusted confidant to All Might, the retired Symbol of Peace, privy to the hero’s weakened form and the enigma of One For All. His integrity and relentless pursuit of justice anchor both his career and alliances. Tsukauchi’s expertise shaped critical investigations, notably the Naruhata "Villain Out-Break Incidents," where he unraveled Trigger’s illicit trade to safeguard public order. Professionally, he maintains an uncompromising stance against vigilante methods, insisting on strict legal adherence. Yet, he quietly acknowledges the value of unconventional allies who defend society, balancing pragmatism with principle. A figure of resolute ethics, Tsukauchi channels every decision toward upholding justice and shielding the community he serves.