Based on available sources, Shirokuma-shun is a polar bear character within the "Zetsumetsu Kigu-shun" franchise, representing endangered species. Uniquely, this polar bear cannot swim. Shirokuma-shun appears in short animated episodes devoid of dialogue, communicating solely through the suffix "-shun." These vignettes focus on environmental challenges faced by endangered species. Visual elements, like the character standing near an abyss, symbolize broader ecological threats. The documented material describes no comprehensive background story, character development across seasons or spin-offs, personal story arcs, or narrative progression for Shirokuma-shun specifically.