Hiroshi claims to be part of the Dollars. He first appears in episode 3, when Izaya trashes his girlfriend Youko's phone. Izaya shaves his head with his flick-blade, and he and the girls flee. A short while later, when Izaya is facing off with Shizuo, Hiroshi appears with an armed group who claim to be members of the Dollars. He and his fellow thugs instigate a fight with Shizuo and are easily beaten.
An image of him is shown in episode 15 on a cover of the tabloid Tokyo Warrior with Takeshi.
He makes his last appearance in episode 25, when he is beaten up by Mairu Orihara for yelling at Kururi, leaving Hiroshi: 0; Orihara: 2.
He is known for his infamous 'Yo, yo, yo. Hey man!' and crotch grab. In volume 6, he is seen again beating up Mikado and kidnapping Non and Rio. He runs away when Anri battles him with Saika.