Mushitaro Oguri

Mushitaro is a man with a big ego who takes pride in his special ability, saying that no detective can ever hope to catch him because of it, call himself 'the King of Crime' and that no one on Earth can force him to repent.

Although he keeps a calm compositor with his ego, Mushitaro can be a very dramatic individual and it's usually played for comic relief. This is shown when he was trying so hard to get Ranpo off his tail and when Ranpo was inches away from uncovering the truth about the murder behind the author Yokomizo. Another dramatic moment of his is when Kōyō and Atsushi unexpectedly broke him out of a bank seek information from him about the Decay of the Angel to help prove the Agency's innocence and he started to speak German gibberish out of confusion.

Despite his ego and pride in his ability, Mushitaro get pretty down when his deceased friend is brought to mind. He's not too fond of mystery novel himself but he sometimes writes mystery stories (though he would struggle with it), thinking that he would find his dear friend appear to him during such times whenever he yearns for his company. He is also protective of his dead friend's reputation to his "ultimate mystery", doing whatever it takes to preserve the public's reception towards Yokomizo's final legacy entrusted to him..