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Zero Kiryuu (錐生 零)Age: 17-18
Birthday: October 24 (Scorpio)
Height: 178-183 cm
Favourite food: ramen and vegetable soup
Yuuki's childhood friend, Zero is also a Guardian and likewise on the disciplinary committee. Yuuki has been taking care of him as her little brother since he was brought into their home (the Headmaster's). His family, a line of vampire hunters, was murdered by the pure blood vampire Shizuka Hio when he was young. He harbors a deep hatred for vampires and claims to have taken on the role of Guardian to learn to hunt them better.