Kuma-san is an 8-year-old bear character within the Nontan universe who serves as a leader figure, stepping in to assist others during times of trouble. Though often occupied with his own activities, he prioritizes helping when needed. His interests include reading books, taking naps, and fishing.

He coexists with Nontan and other characters: Buta-san the piglet, rabbit triplets, Tanuki-san the raccoon dog, Tartan (Nontan's sister), and Hachi-san the bee, maintaining a consistently supportive role within this group. Kuma-san's design and interactions emphasize his dependable and occasionally busy nature. His relationships are defined by cooperative coexistence, without significant conflict or growth arcs. The character remains consistent, with no documented background story, character development, narrative evolution, transformations, or extended history in the available sources.