Naomasa Tsukauchi is a police detective in My Hero Academia and My Hero Academia: Vigilantes. He's one of the few people trusted with the secret of All Might's true form and serves as a key liaison between heroes and the police. Personality Tsukauchi is: Serious and hardworking – He takes his duties as a detective very seriously and is dedicated to upholding the law. Honest and trustworthy – His integrity is one reason All Might trusts him with highly sensitive information. Law-abiding but pragmatic – Although he dislikes vigilantism because it is illegal, he can recognize when someone's intentions are genuinely heroic and will work with them when necessary. Compassionate – He believes that even villains can be redeemed and should be treated as human beings rather than written off entirely. Protective of friends and family – He deeply cares for his younger sister, Makoto Tsukauchi, and is a loyal friend to All Might. Quirk Officially, Naomasa's Quirk has never been confirmed in canon. However, there is a long-running fan theory that he possesses a lie-detection Quirk, because: His sister Makoto has the Polygraph Quirk, which can detect lies under certain conditions. All For One mentioned stealing a lie-detection-type Quirk from one of Tsukauchi's ancestors. Tsukauchi's old code name was reportedly "True Man," which fueled speculation. Despite these clues, the manga never explicitly reveals that Naomasa himself has a lie-detection Quirk. His only confirmed ability is his exceptional detective skill and deductive reasoning. Quick Summary Occupation: Police Detective Personality: Honest, intelligent, diligent, compassionate, and highly principled. Quirk: Unknown/Unconfirmed. A lie-detection Quirk is a popular theory but not officially canon.