Yukako Yamagishi is a side character in Jojo's Bizarre Adventure: Diamond is Unbreakable. She is a resident of Morioh who attends school with the main characters. She becomes infatuated with Koichi Hirose. She attempts to kidnap him and threaten him with her Stand, Love Deluxe. With this Stand, she can wield her long, flowing hair as a weapon. Although Yukako realizes the error of her ways, she still loves Koichi. She goes to the Cinderella salon to get a makeover to impress him. When it goes wrong, Koichi comes to her defense, and the two become a couple for real.

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