Chris Kyle's wife, whose perspective as a secondary narrator highlights the challenges faced by military families, offering a personal and domestic contrast to the combat narratives.

An Iraqi Shi’a cleric and political leader, known for leading opposition to the US presence in Iraq, who is depicted in the memoir as a key adversary during Kyle's deployments.

A fellow Navy SEAL and author, whose experiences parallel and provide a benchmark for Kyle, sharing the culture and challenges faced by special operators.

Navy SEAL teammates of Kyle, whose experiences of injury and sacrifice in Iraq underscore the dangers of military operations and highlight themes of loss and brotherhood.

Co-authors who assisted Kyle in turning his experiences into a memoir, helping with the structure, pacing, and incorporation of military details.