Evangeline is a young woman with distinctive golden-pink hair and a natural inclination toward happy endings. In the Magnificent North, she acts as a "key" whose blood can open magical doors. Though she is told she is happily married to Prince Apollo, an underlying unease and her missing memories drive her to question her surroundings. She bravely seeks the truth about her past, despite warnings that the answers might cause her pain.

Prince Apollo of the Magnificent North presents himself as a dashing hero out of a fairy tale. Following a period of being cursed, he uses his royal influence to control the narrative of his kingdom and his marriage to Evangeline. He is deeply possessive, driven by a need to be adored by his subjects, and justifies his controlling actions under the guise of protection.

Jacks is the Prince of Hearts, an immortal Fate whose kiss is fatal to anyone except his one true love. He has a complicated, often painful history with Evangeline. Convinced that his presence only brings her harm, he tries to keep his distance. However, his deep affection continually draws him back to protect her from the shadows.

Aurora is a princess of the Valor family, the original royal bloodline of the North, who recently awakened from a long slumber. With her beautiful exterior, she easily charms those around her. Beneath her sweet facade, she is highly self-centered and uses subtle influence to orchestrate situations to her advantage, particularly concerning her long-standing fixation on Jacks.

LaLa is the Unwed Bride Fate and Evangeline's loyal best friend. Having been separated from Evangeline previously, she reunites with her to offer support and guidance. Because she is also an immortal Fate, LaLa understands behavior differently than humans do, providing Evangeline with essential context regarding Jacks's distant actions.

Castor Valor, also known as the vampire Chaos, is an immortal who acts as a confidant to Jacks. Turned into a vampire centuries ago by his family, he possesses an understanding of emotion that Fates often lack. He serves as a sounding board, directly challenging Jacks on his decisions and forcing him to confront uncomfortable truths about his behavior.