Yuki Cross (黒主 優姫 ,Kurosu Yūki)

is the adoptive daughter of the headmaster of Cross Academy, and a Guardian, one of the members of the school's disciplinary committee. Ten years prior to the start of the series, Yuki was rescued from a vampire attack by another vampire, Kaname. She lost all memory of her life from before the attack, and was adopted by Headmaster Cross. After Zero's vampire nature is revealed, she begins giving him her blood to drink. However, Yuki loves Kaname, who has always been protecting her and has been by her side during her childhood as a vampire. When Rido Kuran, their uncle, resurfaces at Cross Academy, Yuki's memories are unlocked, revealing that she is actually a pureblood vampire, both Kaname's sister and his fiancee.