Yūki Yoshino is a second-year student at Tōtsuki Culinary Institute residing in Polar Star Dormitory. She possesses a petite stature, teal eyes, and amber hair often styled in twin buns. Her casual dorm attire features a pink-and-white striped shirt under a blue sweater, violet shorts, and orange slippers. The standard school uniform includes a long blue coat over a white shirt with a red-and-black striped tie, a brown-checkered short skirt, white thigh-high socks, and brown shoes. For cooking, she dons the standard white chef's uniform with black trim. Characterized by a cheerful, energetic, and extroverted nature, Yūki serves as Polar Star Dormitory's primary mood-maker. She exhibits childlike enthusiasm, readily engages in gossip, and shows immediate interest in peers' romantic developments. Her speech pattern includes adding the suffix "-cchi" to the names of individuals she likes. Yūki experiences emotions intensely, shifting rapidly between excitement, worry, anger, or sadness. A core aspect is her fierce loyalty and dedication to maintaining the unity of Polar Star's 92nd Generation residents. This devotion is demonstrated when she slaps Sōma Yukihira after his high-stakes shokugeki to protect Megumi Tadokoro from expulsion, chastising him for endangering their group's cohesion. Her culinary specialty centers on wild game (gibier), with expertise in breeding and raising animals like deer, geese, rabbits, and wild boar within her dorm room. She aspires to develop a proprietary Polar Star animal breed. During the 43rd Tōtsuki Autumn Election preliminary round, she prepared "Duck Cutlet Wild Game Curry" incorporating oranges, earning praise for its quality ingredients and flavor profile, though she did not advance further. Yūki's involvement begins at the 92nd Generation orientation ceremony alongside Ryōko Sakaki. After Sōma Yukihira joins Polar Star, she takes part in his welcoming party and observes his initial cook-off against Satoshi Isshiki. At the Tōtsuki Friendship and Rapport Training Camp, she completes all assigned tasks, including a demanding overnight breakfast buffet challenge requiring 200 dishes, demonstrating resilience despite exhaustion and emotional stress. She later qualifies as one of 60 participants for the Autumn Election after initial consideration by the Elite Ten, enthusiastically cheering for Megumi during the tournament. Following the rebels' victory in the Régiment de Cuisine and the resulting organizational changes at Tōtsuki, Yūki continues her studies. Four months later, she participates in the BLUE cooking competition alongside other Polar Star residents. Her aspiration to maintain dorm unity remains central, reflecting her ongoing commitment to communal bonds within the academy environment.