Naomasa Tsukauchi

Male police officer. His rank is police inspector. He is an old acquaintance of All Might and one of the few people who knows his secret. He is 36 years old. He handles all cases related to the Villain Alliance, and his analytical and profiling abilities are very high.

In "Vigilante," his sister appears. Initially, he had no connection to All Might, but through the assistance of his detective colleague Tanuma, he took over the tasks that Tanuma had been handling, such as creating reports on All Might's hero activities.