Yoriko Fujiwara functions as an older sister figure in the dormitory and is Konomi Fujiwara's biological older sister. She possesses light red shoulder-length hair, golden eyes, and stands 1.66 meters tall. Born on April 19 under the Aries sign, she is 22 years old and resides among the dormitory's older group with Yū Tsukishiro and Sonoa Mitsui.

Her carefree and cheerful personality leads her to adopt a supportive, quasi-maternal role for younger residents like Hanabi Natsuno, guiding them through communal living adjustments. She contrasts with Konomi through her heightened maturity in demeanor and appearance. Yoriko primarily offers stability within the group, avoiding central conflicts while consistently fulfilling her secondary role as a nurturing presence across media adaptations.