Costar is one of fifteen boys stranded on a desert island when their ship drifts out to sea. His overweight physique underscores a constant, gnawing hunger throughout their ordeal. Within the group, he holds no leadership role and performs no specialized tasks like hunting or construction. Instead, his defining trait is an unwavering fixation on food scarcity. The narrative offers no extended backstory, personal evolution, or individual history for Costar—no family details or distinct development emerge. His interactions center solely on the collective struggle for sustenance. He functions purely as part of the group’s efforts to preserve resources and order, anchored entirely by his immediate physical needs and integration into the shared survival experience.