Batako-san is Uncle Jam's dedicated bakery assistant, actively participating in baking while managing cleaning, laundry, and deliveries. Her critical duties include maintaining Anpanman's functionality by replacing his damaged head with Uncle Jam's freshly baked ones and expertly mending torn capes for Anpanman and other heroes, utilizing seamstress skills that also create dresses and various items.

She witnessed Anpanman's birth when a shooting star landed in Uncle Jam's oven and subsequently helped raise him, providing consistent motherly care throughout his life, including nurturing him during recovery periods when weakened. Her relationships extend to Cheese, the bakery dog, whom she named, advocated to keep, and frequently translates. They often undertake deliveries together, sometimes accompanied by Uncle Jam.

While maintaining generally positive interactions with characters like Currypanman and Shokupanman, these dynamics receive less narrative focus. A past long-distance relationship with Omusubiman was indicated but remains unexplored in later stories.

Early concept art depicted her as an infant found in the woods by a young Anpanman, though this backstory was discarded in the final narrative, establishing her as older than Anpanman. Despite her human-like appearance, the series presents little to no human presence in its world.

Batako-san's role in "Sore Ike! Anpanman: Ruby no Negai" and other spin-offs or OVAs remains supportive without documented unique narrative contributions or character-specific development.