A merciless bandit who is feared by many. He's quite rambunctious, and can often be found nursing a bottle of sake or similar drinks when he is not partaking in the nasty crimes.

Although branded as a real bad guy, Koyomi actually has a soft spot for the underdog... so it is very possible that he may, despite his protests and denials of such, stand up and so something good for someone, depending on the situation.