Kaeya has blue hair and blue eyes. He has small, sharp fangs. Despite being a vampire, Kaeya rarely desires human blood, instead forcing himself to eat human food. When Kaeya bites someone, they don’t feel a lot of pain, but instead calmness and relief. Because of his vampire bloodline, when Kaeya bites someone, they too become a vampire if he wants them too, and that will bond him and that person together as it is a mark of fate. Kaeya is flirty and mysterious.