* Grey Forester: A quiet, enigmatic boy with a hidden identity and a gift for communicating with animals. An assassin tasked with hunting Rory down, circumstances draw him to protect Rory despite his orders.
* Tamsin "Tamsyn" Holmes: A streetwise con artist with a knack for deception. She uses her charms to survive, always looking for the next big score. She forms a reluctant and at times contentious friendship with Rory.
* Kai Blackwood: A kind-hearted, noble heir with a thirst for knowledge and a passion for justice. Kai becomes close to Rory after she saves him during a botched assassination attempt.