Batako-san serves as the primary assistant to Uncle Jam in his bakery, a role that places her at the very heart of the world of Anpanman. Her responsibilities are far-reaching and essential, extending well beyond ordinary baking duties. She is a skilled craftsperson responsible for creating and mending the flight capes worn by Anpanman and his hero allies, a task of critical importance as damage to these capes directly results in the loss of their ability to fly. Furthermore, Batako-san plays a direct and vital role in sustaining Anpanman himself. When his anpan head becomes damaged, depleted, or dirty from his heroic deeds, she is the one who provides him with a new, freshly baked head prepared by Uncle Jam, often throwing it to him during emergencies to restore his strength. Her ingenuity also contributes to Anpanman's safety, as she designed a special transparent helmet he wears to protect his head from rain or water, which would otherwise weaken him.

Batako-san's connection to Anpanman is deeply familial. She was present at his birth when a star of life landed on one of Uncle Jam's anpan, and alongside the baker, she helped raise him, effectively becoming a motherly figure in his life. This nurturing bond is the cornerstone of her character, and her every action is driven by a quiet, steadfast dedication to his well-being and to the smooth operation of the bakery that serves as a base for him and his friends. She shares a similarly close bond with Cheese, the small dog who lives at the bakery. Batako-san named him, advocated for the bakery to keep him, and is often seen working alongside him, interpreting his barks for others and partnering with him on bread deliveries, sometimes accompanied by Uncle Jam.

In terms of personality, Batako-san is consistently depicted as kind, caring, and polite, with a bright and optimistic outlook. She is remarkably hardworking, always busy with tasks such as baking, cleaning, laundry, and delivering goods. While her primary focus is on her work and supporting the heroes, she is occasionally portrayed as being somewhat forgetful, though this never overshadows her deep sense of responsibility. Her appearance features rosy cheeks, black eyes, and a small, round button nose. She has spiky black hair, which appears shorter in later series iterations, and typically wears blue overalls over a white vest, topped with a chef's hat that conceals her bangs; when she removes the hat, her hair is revealed to be a bowl cut.

While her relationships with other heroes like Shokupanman and Currypanman are friendly, they are not as deeply explored as her connections to Anpanman, Uncle Jam, and Cheese. Early concept art for the series presented a different origin, where a young Anpanman would find Batako-san as an abandoned infant in the woods. This backstory was ultimately discarded, and in the established narrative, she is older than Anpanman and integral to his beginnings. There is a subtle, unexplored hint at a past long-distance relationship with a character named Omusubiman, but this is no longer referenced in later stories. A notable and consistent aspect of her character is her human-like appearance, which exists within a world that official sources state contains few to no actual humans, adding a layer of quiet uniqueness to her presence. Throughout the franchise, including the film Soreike! Anpanman: Hashire! Waku Waku Anpanman Grand Prix, Batako-san's role remains consistent: she is the reliable, kind-hearted, and indispensable support system who ensures the heroes can continue their missions, cementing her place as a cornerstone of the bakery family.