Jun Shiomi lectures at Tōtsuki Culinary Academy and leads the Shiomi Seminar, focusing on spice research. A 74th Generation alumnus, she once lived in the Polar Star Dormitory. Despite being in her 30s, her youthful appearance—151 cm tall with a petite frame, high ponytail, and rectangular glasses—often leads others to mistake her for a junior high student. She favors casual clothing such as a "Spice"-themed T-shirt and track shorts, typically covered by an oversized lab coat during lectures. Her personality merges intense academic passion with social awkwardness. Jun possesses encyclopedic spice knowledge, earning her the title "Authority of Spices," yet she is scatterbrained, relying heavily on her assistant, Akira Hayama, for daily tasks like tending spice plants or remembering meals. Prone to low self-esteem, she falls into "apology loops" with similarly timid individuals like Megumi Tadokoro. She holds a deep grudge against Jōichirō Saiba for subjecting her to traumatic taste-testing of his experimental dishes during their student days, resentment she initially extends to his son, Sōma Yukihira, punching him upon learning his identity. Jun passed the Polar Star Dormitory entrance exam on her first attempt in middle school. She later joined the Elite Ten Council, though her specific seat remains undocumented. After graduating, she became Tōtsuki's youngest lecturer. During an overseas spice-research trip, she encountered Akira Hayama identifying a vendor's low-quality spices. Impressed by his olfactory skills, she recruited him as her assistant, forging a partnership where her theoretical expertise complements his practical application. In the Autumn Election arc, Jun mentors Sōma and Megumi at Akira's urging, delivering passionate lectures on spices despite frequent digressions. She observes the election closely, celebrating Akira's first-place finish in Block A. Later, she informs Sōma and Ryō Kurokiba about the expulsion risks of the Stagiaire event. During the Moon Banquet Festival, she permits Alice Nakiri to collaborate with Akira, misinterpreting their partnership as friendship. Her seminar faces temporary disbandment under Azami Nakiri's "Central" administration but is reinstated after the Régiment de Cuisine. Her exact activities during the Promotion Exams and BLUE tournament arcs are not detailed in available sources.