Naomasa is a tall man with short, black hair and somewhat-rectangular black eyes.
As a member of the police force, he is normally seen in his uniform, which consists of his signature tan overcoat and matching hat, underneath which he wears a black suit, a green tie at his neck with matching slacks and dress shoes.
Detective Tsukauchi is an earnest, hardworking individual who has earned the right to be a close friend of All Might, enough so, that he was even entrusted with the truth about One For All and the former's true form.
As a detective working with the law, Naomasa is strict and does not approve of vigilantism, which, despite having heroic intentions, is still illegal and therefore makes them Villains. However, despite vigilantism being illegal, he is shown to be grateful for The Crawler helping to protect the Tokyo Sky Egg from Bomber villains.
He appears to have a close relationship with All Might, as he even leaked sensitive information to the hero just because he felt it was the right thing to do. He is shown to be hesitant with requesting All Might for help, even when there are thousands of lives at stake, although he decides to go against police procedure to let All Might rescue the Tokyo Sky Egg.
Naomasa also cares a lot for his sister, Makoto, as shown when he desperately cried for help to All Might to rescue his sister. Makoto would often tease her brother and challenges authority (although not to the point of committing anything illegal), which would annoy Naomasa quite a bit. However, the two can get to the point of argument, such as when Makoto argued that Pop☆Step shouldn't be treated as a villain after several bombings, while Naomasa tells her to quit arguing for the sake of it.
Deductive Intellect: As a police detective, Naomasa likely possesses above-average powers of deduction.
Vigilantes Chapter Appearances
- In his prototype desing, Naomasa had the suit unbuttoned, a vest, a striped pants, in the sleeves he had more details and he did not wear gloves.
- Originally, his last name was Tsukanai 
- According to the official twitter, his Code Name is "True Man".
- He also shares his birthday with Tomura Shigaraki, Chiyo Shuzenji and Kesagiriman.
- Naomasa's favorite thing is baseball.
- The kanji in Naomasa Tsukauchi, Nao "直"(lit. straight) and masa "正" (lit. correct, justice, righteous). Tsuka "塚" (lit. mound) and uchi "内" (lit. inside, within).
- My Hero Academia Official Character Book Ultra Archive.
- My Hero Academia Manga: Vol. 3, Omake
|Detectives||Naomasa Tsukauchi • Tanuma|
|Officers||Sansa Tamakawa • Monika Kaniyashiki|
|Families and Civilians|
|Asui Family||Beru Asui • Ganma Asui • Tsuyu Asui • Samidare Asui • Satsuki Asui|
|Bakugo Family||Masaru Bakugo • Mitsuki Bakugo • Katsuki Bakugo|
|Ida Family||Tensei Ida • Tenya Ida|
|Jiro Family||Kyotoku Jiro • Mika Jiro • Kyoka Jiro|
|Midoriya Family||Hisashi Midoriya • Inko Midoriya • Izuku Midoriya|
|Shimano Family||Katsuma Shimano • Mahoro Shimano|
|Shimura Family||Chizuo • Hana Shimura • Kotaro Shimura • Mako • Nana Shimura • Nao Shimura • Tenko Shimura|
|Todoroki Family||Enji Todoroki • Rei Todoroki • Fuyumi Todoroki • Natsuo Todoroki • Shoto Todoroki • Toya Todoroki|
|Tsukauchi Family||Makoto Tsukauchi • Naomasa Tsukauchi|
|Shield Family||David Shield • Melissa Shield|
|Haimawari Family||Koichi Haimawari • Shoko Haimawari|
|Oguro Family||Iwao Oguro • Tamao Oguro|
|Skyline Family||Christopher Skyline • Pamela|
|Civilians||Aorio Kuraishisu • Daikaku Miyagi • Eri • Hime • Ichimoku Samazu • Jube Namimaru • Komari Ikoma • Kota Izumi • Luminescent Baby • Miyashita • Public Safety Commission President • Rin Yaritezawa • Saito • Samuel Abraham • Sho • Takuto • Tamashiro • Taneo Tokuda • Teruo Hazukashi • The Mother of Quirks • Tsubasa • Untenmaru Kurumada • Yokumiru Mera|