+ Somerset
- Profile: World-weary, experienced detective on the verge of retirement.
- Motivation: Seeks escape from the city's darkness and violence.
- Relationship: Mentor figure to Mills, initially skeptical of his idealism.
- Development: Reconsiders his decision to retire, possibly inspired by Mills's tragedy.
+ Mills
- Profile: Young, idealistic detective recently transferred to the city.
- Motivation: Eager to prove himself and make a difference.
- Relationship: Initially clashes with Somerset due to differing perspectives.
- Development: Loses his innocence and is consumed by wrath, becoming the final sin.
+ John Doe
- Profile: Highly intelligent and meticulous serial killer.
- Motivation: Believes he is enacting God's will by punishing sinners.
- Relationship: Antagonist to Somerset and Mills, orchestrating their actions.
- Development: Remains enigmatic and unwavering in his convictions until the end.
+ Tracy
- Profile: Mills's wife, pregnant and struggling to adjust to city life.
- Motivation: Desires a better life for her and her unborn child.
- Relationship: Close to Mills, but also forms a bond with Somerset.
- Development: Her death is the catalyst for Mills's final act of wrath.