Ishishi serves as one of the twin boar companions to Zorori, functioning alongside his twin Noshishi as deuteragonists and primary sidekicks in their travels. Both anthropomorphic brown boars wear green shorts and orange vests, with Noshishi’s right-cheek mole as their sole distinguishing feature. The twins share mischievous personalities and a mutual fondness for sweet foods, consistently participating in Zorori’s schemes and adventures. A single reference in the 1993 film "Kaiketsu Zorori" notes their oath not to return to their village until becoming "real villains," though this detail remains unexplored in later adaptations. Their names derive from the Japanese word "Inoshishi" (wild boar), split to form individual identities. While Noshishi displays artistic skill in drawing within one episode, no specialized traits or skills are attributed to Ishishi. Ishishi’s character arc shows no documented narrative development or significant evolution across official media, including OVAs, films, or spin-offs.