Xaden Riorson is Violet's secondary love interest and initially seen as an antagonist. As a rebel's child marked by the Navarre government, he is a powerful shadow wielder capable of gathering intelligence and altering his environment. He becomes Violet's teacher and lover as they form an emotional connection, challenging her views and teaching her to navigate complex power dynamics.

Dain Aetos is Violet's childhood best friend and first love interest, also serving as her squad leader. His strict adherence to rules often places him at odds with Violet. He has the rare ability to access recent memories through touch, which he misuses, complicating his relationship with Violet and making him a foil to Xaden's character.

Rhiannon Matthias is a peer in the Rider Quadrant and Violet's closest friend. Skilled in hand-to-hand combat, she believes in Violet's capabilities and provides a supportive environment for her to develop new skills. Rhiannon becomes Violet's confidant and helps reinforce Violet's strengths, providing a contrasting friendship dynamic to Dain's controlling nature.

Jack Barlowe is the novel's primary antagonist, known for his brutal reputation as a strong and vicious recruit. Despite his intimidating presence, he lacks psychological strength and ultimately fails in his ambition to become a successful dragon rider. His downfall marks a significant turning point in Violet's character development.

Liam Mairi is a first-year rider cadet and Xaden's foster brother. Muscular and capable, he becomes Violet's bodyguard and friend, helping her bridge the gap with rebel cadets and challenge her preconceived notions. His life stories provoke Violet's growth, and his eventual death solidifies her commitment to the rebels' cause.

General Lilith Sorrengail is the leader of Basgaith War College and Violet's mother. Her actions, driven by a desire for Violet to become a rider despite her physical limitations, set off the novel's events. She is a complex figure in Violet's life, embodying Violet's deepest conflicts regarding familial approval and independence.