Zero Kiryu

Zero is generally a composed person. He is also protective of Yuki. Although he comes across to other students as cold hearted and hostile, he is friendlier towards Yuki and occasionally shows his true emotions to her. However, when Yuki was revealed to be a Pureblood vampire, he became cold and hostile, especially towards Kaname and Yuki. Though he appears otherwise, he is a gentle and kind person. Due to his childhood, he builds barriers around himself, and does not let these barriers down all the way, even for Yuki. Despite this, he has a kind heart which longs to protect humans, and he will never betray the ones he holds dear. As a child, Zero was once a quiet and gentle boy, to the point that Ichiru questioned whether or not he was even capable of being a vampire hunter. However, after Shizuka's attack, Zero developed a strong hatred towards vampires. Zero is a tsundere character; he sports a scary aura that makes most of the Day Class students wary of him. He can also glare in a way that even Kaname calls scary. However, his innate nature is to protect humans, and his cold attitude towards those he loves is likely to push them away and keep everyone at a distance. Following his full awakening as a vampire, Zero harbors a great disgust towards himself because of his inability to control his hunger and his reliance on Yuki. His dismal outlook on his future, and fear of what he might do if he becomes a level E, causes him to give up and he almost kill himself with his anti-vampire gun - the Bloody Rose. However, Yuki arrives just in time to stop him. At times, he would rather ignore his hunger to the point of starvation instead of going to Yuki for help. He tries to help Yuki resolve her own problems and then impresses upon her that its alright for her to burden and use him because she owns him.