Zero Kiryu is the secondary main character in the anime Vampire Knight. He is part of the Day Class, though he is secretly a vampire. Together with Yuki Cross, he protects the human students from the vampire students. He is also a vampire hunter, and his tattoo, called the Hunter's Seal, is used to suppress and tame his vampiric nature. He struggles with his desire for blood and his equally strong desire to kill those of his kind. While he usually cold-hearted and hostile, he shows his real emotions to Yuki, and feels very protective of her. Throughout the series, they develop a romantic relationship and eventually have a daughter named Ren.

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