Hiroshi is an erefan charabom debuting in the Bomberman Jetters anime in episode 11. Her real name is Kyasari; she was nicknamed Hiroshi by White Bomber. The Jetters have mistakenly thought of her as a boy.
During the Karei Meteor Shower, the Jetters were watching the shower when unexpectedly one was coming straight at the Jetters HQ. Upon crashing, it was discovered to be an escape pod. When the Jetters opened the pod, something grabs White Bomber inside. Now that the Jetters know it is a charabom from Planet Charabom, they figured it was best to return Hiroshi to her mother.