Saeris's love interest and ally, initially meeting as an antagonist but eventually forming a deep romantic bond. He struggles with his quicksilver poisoning and plays a key role in the narrative's political and emotional arcs.

A close friend and ally to Fisher, acting as a voice of reason and a supportive figure within the story. He aids in the plot development through his interactions with key characters.

A smuggler and ally to Saeris, known for his flirtatious and comic nature. Despite his relaxed demeanor, he is capable and assists significantly in both plot and conflict resolution.

An elite soldier and close ally of Kingfisher, restored from near-death through soul magic. He plays a supporting role, contributing to pivotal moments with his unique actions and abilities.

A group of antagonists—Malcolm, a powerful vampire ruler; Belikon, the manipulative king of Yvelia; and Madra, the despotic queen of Zilvaren. They are siblings whose tactics and ambitions drive much of the story's conflict.