Shima is a fictional character based on the real-life utaite of the same name from the vocal unit Urashimasakatasen. In the anime, he appears as a purple-haired high school student with distinctive snaggle teeth, honoring the group's assigned purple color motif. His personality reflects his real-life counterpart, known for his charm and flashes of vanity.

Within the unit, Shima shares close bonds with members Uratanuki, Sakata, and Senra, reflecting their off-screen camaraderie. This includes forming subgroups like ShimaSaka with Sakata and ShimaSen with Senra for specific musical projects. As part of Urashimasakatasen, he performs theme songs such as "Calendar Reminder" for their anime series and "Ready" for *Akudama Drive*.

His background involves transferring into high school alongside his unitmates, where they face everyday scenarios and comedic exchanges. His design incorporates subtle real-life references, like a purple squirrel mascot named Maaru, though this detail remains subtle in the anime. Available materials document no canonical backstory or development beyond this high school framework.