 After Ichigo's return from Soul Society, the hollow-based characters known as arrancar are introduced, with the basic hollows having lesser roles and rarely used as villains except in the anime side-story episodes.Fishbone D is a fish-like humanoid Hollow that Rukia Kuchiki was hunting before he attacked the Kurosaki Clinic, resulting in the events that set up the story premise by wounding Rukia who is forced to transfer her powers to Ichigo Kurosaki who kills the Hollow in her stead.In life, was Orihime's older brother and guardian before he died three years before the events of the series.