The Kiryus (Zero and Ichiru's parents)

They were Zero and Ichiru's parents and were also Vampire Hunters. They were murdered by Shizuka Hio as an act of revenge for killing her ex-human vampire lover.

Appearance
The father bears a striking resemblance to Zero and Ichiru in terms of hair and skin coloring, as their hair is silver like his. The mother has long dark blonde hair tied in a low ponytail with her facial structure much like Zero and Ichiru's.

Personality
No one knows much of their personalities, but they both love their sons.

History
Both Kiryu's were high-ranking Vampire Hunters, and are the parents of Zero and Ichiru Kiryu. Despite loving both their sons dearly, the Kiryu's felt Ichiru's illness and lack of natural talent in comparison to Zero would prevent him from becoming a Hunter. For this reason, they focused more of their time on developing Zero's skills as a Hunter, giving Ichiru the impression they favored Zero over him. Ichiru's resentment over his parents' seemingly preferential treatment of his brother would have tragic consequences later on and lead to the destruction of the Kiryu family. These events would be set in motion the night the Kiryus were assigned to kill an ex-human vampire who they'd been told had fallen to Level E. Unfortunately, the Kiryus were lied to and had been used as pawns by Rido Kuran to kill the ex-human vampire who had become his fiancée, Shizuka Hio's lover. Shizuka's grief over the death of her lover would drive her to insanity, and later, to revenge. With the assistance of Ichiru, who had become captivated by her, Shizuka killed both Kiryu's, turned Zero into a vampire, and took Ichiru away.

Powers & Abilities
Zero and Ichiru's parents, are vampire hunters, so they have a faster recovery than humans. They have also the powers to sense nearby vampires. Their powers seem better than another vampire hunters.

Equipment
Zero and Ichiru's father fights with two swords, Zero and Ichiru's mother fights with a wire.

Relationships
Both were known to be out a lot on missions so Yagari watched the twins.

Trivia

 * Zero's and Ichiru's mother is the first female hunter who appears in the manga.
 * They often move to different locations to escape the vampires.
 * They both hated vampires, this ironic, because their only grandson was born a vampire.