Miiko, whose real name is Shizue Baba, is a supporting character in the anime Jellyfish Can't Swim in the Night. She is a 31-year-old single mother who works as the owner of a snack bar in Shibuya and performs as an underground idol under the stage name Miiko, once known as Miko. Miiko enthusiastically calls herself the top galaxy idol candidate, reflecting a confident and somewhat eccentric personality. Her motivations center on balancing the demands of raising a child, running her snack bar, and pursuing her dream of becoming a successful idol. In the story, Miiko serves as a mentor figure to the main characters of the band JELEE, particularly to Kano Yamanouchi. She frequently provides the girls with a space to practice and offers practical advice drawn from her own years of experience in the music industry. Her snack bar becomes a regular gathering spot for the group, offering a sense of stability and a link to the local Shibuya music scene. While Miiko does not undergo a dramatic personal arc herself, her role is crucial to the protagonists' growth: she facilitates their creative development, shares wisdom about the challenges of being a female performer, and supports their journey toward independence. Her notable abilities include veteran singing skills, a deep understanding of the underground idol world, and the resourcefulness required to manage both a business and a family. Through her presence, the series gains a grounded, experienced perspective on the pursuit of artistic dreams.