A first-person narrator and charming chef who owns a successful restaurant in Boston, sharing Sloane's vigilante mission by targeting dangerous criminals. He's a complex character balancing his public persona with his darker pursuits and his romantic relationship with Sloane.

Sloane's best friend who knows about Sloane's vigilante activities and offers support and practical advice. A musician and music therapist for children, she provides moral insight and understanding without judgment.

Rowan's older brother working as a leatherworker and hired assassin in Boston, providing information and resources for Rowan and Sloane's vigilante activities. He plays a supportive role, helping them with various logistical challenges.

Rowan's rational and intelligent younger brother, a doctor in Nebraska, who supports his brothers despite their darker activities. He assists them with medical help when needed.

The targets in Sloane and Rowan's vigilante missions, each presenting unique challenges and moral questions. Their actions drive the narrative's exploration of identity and justice.

A significant target chosen jointly by Sloane and Rowan, representing a joint effort in their vigilante mission. His inclusion enhances the dynamics of their relationship and their pursuit of justice.

An initially perceived harmless man who becomes a surprising antagonist working for Thorsten Harris. His complex character reveals unexpected layers and contributes to the suspense.

New friends of Sloane's, representing her growth in social connections and openness to new relationships. They add to her character development as she becomes more trusting and confident through friendship.