Ruka Souen  

Luca, 早園瑠佳

A female vampire who is well-liked by the Day Class students and is known for being very devoted and protective of Kaname. She appears to have a strong dislike towards Zero, possibly due to Kaname acknowledging him and carrying resentment over Yuukis position in Kanames heart as her own feelings for Kaname run deep. When Yuuki was still young and not yet one of the schools Guardians, she witnessed Kaname drinking Rukas blood during a visit. Although Ruka harbors feelings for Kaname, he does not reciprocate them and only drank her blood once to prevent biting Yuuki.