Zero Kiryuu

Zero stands tall between 5'10" and 6'0", a childhood buddy of Yuuki and a fellow Guardian, both part of the disciplinary committee. After losing his family to the ruthless vampire Shizuka Hio, he's been like a little brother to Yuuki, who took him in when his life fell apart. Beneath his tough exterior lies a dark secret—he's a vampire himself, bitten during that tragic night. While he hunts vampires with vengeance, he struggles with his cravings, as regular blood tablets don’t work for him. His connection to Yuuki grows stronger, even teetering on a near-kiss. Armed with the "Bloody Rose," he’s made her promise to end him if he loses control.