Ruka Souen (早園 瑠佳, Sōen Ruka?) is a female noble vampire who provides a stark contrast to Yuki Cross. Beautiful, intelligent and graceful, Ruka has also been in love with Kaname Kuran since she was a child, ironically she remains completely unaware of Kain's unrequited love for her. She is 175 cm tall. Ruka is one of the most faithful and protective of Kaname. She is also a childhood friend to Aido and Kain. She has an intense jealousy of any humans that raise Kaname's interest, leading the pack in persecuting them. Her character matures towards the end of the first arc, after she learns that Yuki is Kaname's pureblood sister, recognizing the foolishness of her one-sided love for Kaname and the suffering that Yuki will face. Like the rest of the night class, she works with Kain to defend girls in the Day Class during the attack on the school and expresses a desire to protect them from the hostile vampires. Since the time skip, Ruka has been seen giving Yuki etiquette lessons and Yuki is aware that Ruka still appears to have some feelings for Kaname.