Batako-san, nicknamed Butterko, works alongside Uncle Jam in the anime universe, her Japanese moniker "Butter Girl" highlighting her specialization in butter-centric duties. She crafts and mends the flight-enabling capes for Anpanman and his allies, with meticulous repairs ensuring their swift return to action after damage, underscoring her indispensable role in upholding the heroes’ readiness. Diligent and hardworking, she occasionally grapples with forgetfulness. Her responsibilities also include aiding Uncle Jam in replacing Anpanman’s damaged or depleted head—a task essential to his continued heroism. Having helped raise Anpanman, she remains an integral figure in his life, though her connection to him lacks the closeness of his bond with Uncle Jam.

Batako-san appears consistently across the franchise’s films, specials, and episodes as a steadfast background supporter. Her portrayal centers on practical contributions to the narrative, with no elaboration on her personal history or evolution across media iterations.