Ryouko Sakaki, a 92nd-generation student at Tōtsuki Culinary Academy, resides in the Polar Star Dormitory. Her waist-length fuchsia hair, initially styled with chest-length split bangs, is later cropped to chin length following the Régiment de Cuisine. Orange eyes and a slender frame complement her usual attire: the Tōtsuki uniform or a white chef’s coat during culinary tasks. Hailing from the Sakaki family, proprietors of a celebrated koji and fermented goods shop, she specializes in fermentation techniques. Within the dormitory, she curates a dedicated fermentation station, crafting staples like rice juice for communal meals. Her dishes blend tradition with innovation, such as Soy Natto Curry Rice, which layers black koji and fermented soybeans into intricate flavors. Calm and composed, she serves as an anchoring presence at Polar Star, offering reassurance to peers like Yūki Yoshino and Megumi Tadokoro. This steady demeanor contrasts with the dormitory’s more eccentric personalities, earning her the affectionate title of "ane-san" from younger students. At the Friendship and Rapport Training Camp, she overcame rigorous challenges, including an impromptu overnight assignment to prepare 200 servings of an egg-based breakfast. Her fermentation-driven curry later secured her a spot in the 43rd Tōtsuki Autumn Election, captivating judges with depth despite its modest presentation. Collaboration defines her relationships: she guides Sōma Yukihira in refining mackerel dishes through fermentation and engages earnestly with Shun Ibusaki. During crises like the Régiment de Cuisine, her poise provides stability. Post-Regiment, her shortened hairstyle mirrors subtle personal growth. While spin-offs and films offer no additional insights, her role persists as a steadfast, inventive pillar of Polar Star, harmonizing heritage with culinary experimentation.