Noshishi is one of two boar twins serving as primary companions and apprentices to the main protagonist. He is the younger twin brother of Ishishi. Noshishi possesses brown fur and wears typical attire of green shorts and an orange vest, appearing nearly identical to his sibling. His sole distinguishing feature is a mole on his right cheek, consistently shown in depictions. Both twins sometimes wear green scarves and carry blue umbrellas slung across their backs.

Personality-wise, Noshishi shares core traits with his brother and mentor: a pronounced enthusiasm for consuming sweet foods and engaging in mischief. Their loyalty is steadfast, accompanying their mentor on numerous journeys and adventures. While generally aligned with Ishishi, Noshishi occasionally demonstrates individual aptitudes; he possesses notable skill in drawing, capable of accurately reproducing detailed images from memory. This artistic ability surfaces during specific incidents requiring accurate visual replication.

Background details about Noshishi's origins remain largely unexplored. Minimal information exists about his early life before joining the central character. A significant, isolated reference in the 1993 film mentions that he and his brother took an oath not to return to their home village until achieving success as "real villains." This motivation does not resurface in subsequent adaptations. Their initial encounter with their mentor occurs in Levanna Kingdom, within an alley near an Oden stall where they are discovered fighting over food. After shared adventures, including a thwarted scheme to secure a castle and bride, the twins formally propose becoming apprentices to learn prank techniques, solidifying their trio dynamic.

Throughout their travels, Noshishi and his brother evolve beyond mere sidekicks into integral group members. Their camaraderie and occasional blunders directly influence plot outcomes. Their roles consistently provide comic relief through exaggerated antics, big appetites, and childlike enthusiasm. Instances occur where they break the fourth wall, directly addressing the audience. Their relationship with their mentor gradually deepens, showcasing mutual dependence and loyalty despite frequent declarations of self-serving motives. Noshishi’s development remains intertwined with group dynamics rather than focused individual arcs, maintaining his core characteristics of loyalty, mischief, and occasional artistic skill across all official media, including films, series seasons, and OVAs.