Who is Christian Ozera from Frostbite and what is their importance?

Christian is Lissa's boyfriend. Lissa and Christian were originally drawn to one another because both of them are sort of ostracized from Moroi society. Christian's parents became Strigoi, causing his whole family's loyalty to Moroi to be questioned. Lissa's magic element is spirit, which has been thought to be an extinct power and her entire family has been killed in a car accident. For these reasons, Christian and Lissa are drawn to one another and find love in that bond.