Obnoxious, obviously. He thinks he is truly a hero among men, so much so that even men are attracted to him, but not Takeshi. And this makes Hiro become fascinated by Takeshi, very quickly realising he has fallen for him. Hes very dumb when it comes to romance and don't have much common sense, he gets dragged into Takeshi's bondage fetish and constantly gets played with.
Hes the top in the relationship, because it hurt him too much to be a bottom. BUT that will change.