The handsome Crown Prince of the Eastern Commonwealth, thrust into the position of emperor after his father's death. He meets Cinder at the market and grapples with political pressures including a potential marriage alliance.

An older scientist leading the research on the letumosis plague, characterized by his gray hair, blue eyes, and oversized lab coat. He discovers significant truths about Cinder's background through his scientific analyses.

Cinder’s stepmother and mother to Pearl and Peony, who harbors a strong dislike for Cinder. She resents Cinder's presence and views her primarily as a source of income for the household.

The ruler of Luna, known for her ability to use glamour to manipulate others’ perceptions and intentions of marrying Prince Kai. She is rumored to have committed numerous atrocities to gain power.

An android owned by Adri with a unique personality chip that allows her to express human-like emotions and desires. She works as Cinder’s assistant in the mechanic shop and longs for more autonomy.

Cinder’s younger stepsister who shares a close and affectionate bond with her. She has a lively personality and an infatuation with Prince Kai, contrasting with her family's treatment of Cinder.

The advisor to Emperor Rikan and subsequently to Prince Kai, providing guidance through the transition of power. He is a composed and steadfast presence amidst political turmoil.

The head thaumaturge serving Queen Levana, skilled in manipulating appearances. She is loyal to the queen and monitors political developments in the Eastern Commonwealth.

Cinder’s 17-year-old stepsister who mirrors her mother’s dislike of Cinder due to her cyborg nature. She treats Cinder with disdain and views her as an inferior.