Batako-san assists Uncle Jam in their bakery, handling baking, cleaning, laundry, and deliveries. A vital part of her duties involves replacing Anpanman's damaged head to sustain his heroism and crafting or repairing capes for him and other flying heroes with expert sewing. She exhibits rosy cheeks, black eyes, and a small button nose, complemented by spiky black hair—shorter in later series—and typically wears blue overalls over a white vest with a chef's hat covering her bangs, revealing a bowl cut without it. She stands taller than Uncle Jam.

Kind, caring, and polite, she rarely argues and demonstrates diligence through constant tasks. Her occasional forgetfulness contrasts with her skills in baking and seamstress work, including dressmaking. Batako-san and Uncle Jam witnessed Anpanman's birth, raising him as family; she provides maternal care during his recoveries. She shares a deep bond with the bakery dog, Cheese: naming him, advocating for his stay, interpreting his barks, and joining deliveries. Her loyalty to Uncle Jam is familial, though their meeting remains undefined. Interactions with Shokupanman or Currypanman receive less focus than her ties to Anpanman and Cheese. An undeveloped storyline hinted at a long-distance connection with Omusubiman.

Originally conceived as an infant discovered by Anpanman in the woods, this idea was abandoned, cementing her as older than him. She features in media like the DVD "Batako-san to Okashina Kuni," the episode "Batako-san no Tanjoubi," and the picture book "Batako-san and Meiken Cheese."