Zero Kiryu is one of the protagonists of anime, manga series, Vampire Knight.
He was voiced by Mamoru Miyano in Japanese version and Vic Mignogna in English version, both of whom also voice Tamaki Suoh.
He has a tattoo on his neck that allows him to be restrained by a charm that temporarily immobilizes him and allows him to enter the Hunters' Association's headquarters.
Due to the attack, Zero developed a deep hatred and distrust of vampires, despite originally being a gentle character by nature; however, he retains his kindness beneath his scowls, always looking out for the Day Class students in case the Night Class "misbehaves".
He is unique being both a vampire hunter and a vampire. Yuki's close friend and a Cross Academy Guardian, he was trained to be a vampire hunter by Toga Yagari. Zero lives with Kaien Cross and Yuki, after being bitten by a Pureblood vampire, Shizuka Hio, who also murdered his family.
Zero also holds a deep hatred for Kaname Kuran, who tells him that he is simply a shield for Yuki. Zero is deeply in love with Yuki, but chooses to hide it; his feelings left him temporarily confused after Yuki was revealed to be a Pureblood vampire, but Zero continued to love her. In the anime's final episode, Zero lets her drink his blood, allowing Yuki to see how he feels about her. He is one of the few vampires whose body refuses blood tablets, leaving him constantly thirsty for blood; Yuki often gives him her blood to satisfy his thirst. After the time skip, Zero is being considered for the position of president in the future for the Association, and he also drinks the blood of vampires he hunts to satisfy his thirst. He later dies.
- Matsuri Hino described Zero as exemplifying her hesitant nature.
- His Japanese Voice Actor, Mamoru Miyano is best known voicing as Kiba from Wolf's Rain, Zange Natsume from Inu x Boku SS, Death the Kid from Soul Eater, Ling Yao from Fullmetal Alchemist: Brotherhood, Masaomi Kida from Durarara!! and Light Yagami from Death Note.
- His English Voice Actor, Vic Mignogna is best known voicing as Edward from Fullmetal Alchemist series, Tamaki Suoh from Ouran High School Host Club, Obito Uchiha as young, Nagato from Naruto Shippuden, Matt Ishida from Digimon Adventure tri., Eld Jinn from Attack on Titan, Christopher Aonuma from Digimon Fusion, Yoshimori Sumimura from Kekkaishi, Spirit Albarn from Soul Eater, Orochimaru from Naruto Spin-Off: Rock Lee & His Ninja Pals, Fai D. Flowright from Tsubasa: Reservoir Chronicle and Ikkaku Madarame from Bleach.