Shizuka Hiou

Shizuka Hiou (緋桜閑, Hiō Shizuka?) The pureblood vampire who bit Zero Kiryu ; even her fellow vampires are uneasy around her. She is called "Madly Blooming Princess" by her fellow vampires. A manservant whom she loved (a former human vampire, falsely classified by the Hunter's Association as Level E) was assigned to be killed by a Kiryu vampire hunter.

Background
When her fiancee Rido Kuran found out she was in love with a Level D(Former Human) vampire, he contacted the Kiryu family to kill him, saying he was a Level E. Shizuka was angry at this action. Enraged and vengeful, she attacked the Kiryu family, killed Zero and Ichiru's parents, turned Zero into a vampire, and took Zero's twin, Ichiru Kiryu, in as a devoted servant. Shizuka's blood can prevent Zero from falling to Level E, and thus Yuki Cross risked her life for Zero to be able to drink Shizuka's blood. However, to protect Yuki, Kaname Kuran kills Shizuka and drinks her blood, leaving only a small amount for Zero to drink. Unfortunately the blood was drunk by Ichiru who arrived at the scene first. Before dying, Shizuka warns Kaname that he will live in darkness and has summoned a sinister future for himself. She was Rido Kuran's fiancée, but they never got married due to his previous disappearance and her death.