Batako-san works as Uncle Jam's bakery assistant, handling baking, cleaning, laundry, and bread deliveries. A critical part of her role involves restoring Anpanman's strength by replacing his damaged head when dirt, water, or partial consumption compromises it. She also utilizes her sewing skills to create, mend, and repair the flight-enabling capes for Anpanman and other heroes, occasionally crafting additional items like dresses.

Her personality is bright, optimistic, kind, caring, polite, and consistently hardworking. She exhibits strong dedication to her duties but can be somewhat forgetful. She shares a familial bond of care and loyalty with Uncle Jam as his loyal assistant, though their specific past connection is undefined. She maintains a close relationship with Cheese the dog, whom she named; she often interprets his barks, and they frequently partner on bread deliveries.

Present at Anpanman's birth, Batako-san helped raise him alongside Uncle Jam, establishing a maternal dynamic where she provides care through supplying new heads and repairing his cape. Her interactions with heroes like Shokupanman and Currypanman are generally positive but less prominent. Early concept art proposed an alternative origin where a young Anpanman discovered her as an infant in the woods, but the finalized continuity established her as older than Anpanman.

Batako-san's role remains consistently supportive within the bakery and hero maintenance framework across all media, with no specific character development or narrative arcs detailed in films, OVAs, or spin-offs.