Batako-san works as Uncle Jam's assistant in the bakery, crafting and mending the flight capes vital for Anpanman and his allies. She directly sustains Anpanman's heroism by replacing his damaged or depleted head. Despite her consistent forgetfulness, she remains deeply dedicated to these duties. Her role transcends professional assistance, as she helped raise Anpanman alongside Uncle Jam, fostering a familial bond within the bakery.

Appearing across countless franchise entries, including movies and specials such as "Soreike! Anpanman: Hashire! Waku Waku Anpanman Grand Prix" where she is core cast, she stands as a recurring supporting figure. Her Japanese name, "Butter Girl," directly ties her to baking ingredients, aligning with the series' food-themed world alongside Uncle Jam.