* Rylan "Ry" Thorne: A powerful and dangerous Carpathian warrior, who is also a doctor. He struggles with his dark urges and the burden of his immortality.
* Ellie "El" O'Connell: A strong-willed and independent woman, who is a journalist and Ry's love interest. She is drawn to Ry's powerful aura and seeks to understand the secrets behind the Carpathian world.
Other significant characters:
* Stefan: Ry's older brother and the leader of the Carpathian clan.
* Raif: Ry's best friend and fellow warrior.
* Jake: Ry's trusted lieutenant.
* Adriana: Ellie's best friend and a fellow journalist.
While these are the main characters, the book also features several other Carpathian warriors and humans who play important roles in the story.