Syuko Shiomi is an 18-year-old from Kyoto. Dismissed from her family home after a disagreement with her parents, who ran a traditional wagashi shop where she assisted, she was subsequently recruited as an idol and lived in production dormitories. Despite her departure, she maintains contact with her parents; they still supply wagashi which she shares with peers and occasionally consults on new product ideas. She possesses a relaxed and unhurried demeanor, persisting after her relocation. Though capable of laziness, she fulfills responsibilities when needed and demonstrates unexpected leadership capabilities, notably within the unit CAERULA. Attentive to others, she offers subtle support – such as feigning inadequacy during dance rehearsals to ease a fellow idol's self-consciousness. Her playful, mischievous conduct and distinctive upturned eyes frequently associate her with fox imagery, reflected in outfits and comedic portrayals. Syuko often snacks or requests food from the producer. She considers herself proficient in cooking, especially matcha and wagashi, though acknowledges her skills fall short of her mother's. Her hobbies include playing darts, where her ambidexterity allows her to use her non-dominant right hand to accommodate less skilled opponents, and blood donation, which she attributes to both the physical sensation and the post-donation refreshments. Key relationships include her bond with Sae Kobayakawa. Initially wary due to contrasting personalities and backgrounds, their collaboration in Hagoromo Komachi evolved into profound mutual reliance and coordination, prompting others to liken them to a married couple. She is close to Frederica Miyamoto and Shiki Ichinose, occasionally participating in their mischief while sometimes moderating it. She also connects with Minami Nitta, whom she admires for qualities she feels she lacks, and Yumi Aiba. Syuko primarily uses standard Japanese but occasionally shifts into Kansai dialect when conversing with Sae. Her development shows a transition from initial reluctance about idol work to committed participation while retaining her easygoing nature. Leadership roles in units like CAERULA and LiPPS demonstrate her capacity for responsibility despite her typical lax attitude. Recurring themes include Kyoto cultural elements, with several card backgrounds featuring landmarks like Heian Shrine and Kifune Shrine. The fox motif persists across media, including chibi-style animations where her traits are exaggerated for comedic effect.