Rocky's son, initially portrayed as successful and cheerful, whose professional actions prompt a moral crisis within the family. He works for a consulting firm and his role raises questions about ethics in the corporate world.

Rocky's husband, a calm and practical physical therapist who counters Rocky’s anxiety with his laid-back demeanor. He provides stability and support, focusing on family unity.

Rocky and Nick’s daughter, who shares her mother's anxiety but also acts as the family’s moral compass. She is empathetic and vocal about ethical concerns.

Rocky’s father, a widower who lives close to Rocky and her family, bringing comic relief and poignancy through his crankiness and expressions of grief.

A character who is central to the novel's conflict due to his death in a train accident. He represents the random nature of tragedy and human cost tied to corporate decisions.

Miles's mother, who communicates her grief and blame through social media, giving a personal face to the tragedy and its consequences.