Mao is an information broker, based in Yokohama. He is often seen in the presence of Tanker-kun.
Mao has a mop of brown hair and brown eyes. He is of average build and sports a pair of black glasses. In Hamatora: The Animation, he wears a long green Chinese cloak. In Re: Hamatora, he is seen to be wearing a light brown track suit
Not much is known about Mao but he seems to be a laid-back individual, who does not seem to mind who people are unless they're a client as shown in episode 11. He is often seen eating. He is very dedicated to his work, but as he says in episode 10, even he has his limits.