Yuki Sakurakouji serves as the adoptive mother of Sakura Sakurakouji and wife of Goutoku Sakurakouji, raising Sakura after her biological parents' abandonment, with Sakura's biological mother being distant relatives of Yuki and Goutoku. Her petite, youthful frame and appearance frequently cause others to mistake her for Sakura's younger sister. She features wavy, chest-length light-brown hair and darker brown eyes. An enthusiastic cosplayer, Yuki dons varied costumes like school uniforms and police detective attire, maintaining a closet stocked with outfits. She exhibits a deeply caring and protective nature toward her daughter, evidenced when Sakura hosted friends—Yuki provided meals and a dedicated room for them. This protectiveness surfaces starkly upon learning Sakura stayed with Rei Ogami and others; Yuki texted Ogami a warning to stay away from Sakura, threatening to kill him if any harm befell her. Alcohol consumption triggers a violent side in her. Rei Ogami characterized Yuki as "blind in love for her children," observing she photographed every milestone in Sakura's life—such as her first school day and first wasabi taste—while lamenting she should have captured more moments. Her surname combines "cherry blossom" (桜), "small" (小), and "street" (路), with "Sakura" potentially deriving from characters for "blossom" (咲) and "good, virtuous, respectable" (良).