Chris Brown is a seasoned Martian police detective serving in the late 21st century, specifically within the city of St. Lowell on Mars. A former resident of Earth, he relocated to the red planet following the death of his wife, a tragedy that left him emotionally guarded and deeply cynical. This personal history has fostered a strong distrust of advanced technology, particularly androids known as "Third Types," whom he often views with suspicion and prejudice. Upon his transfer to the Martian police force, he is unexpectedly partnered with a female officer named Naomi Armitage, whose impulsive and reckless nature initially clashes with his by-the-book mentality.

Underneath his gruff and often pragmatic exterior, Chris possesses a strong sense of justice and a hidden capacity for empathy. As he and Naomi investigate a series of murders targeting "Third Type" androids, he is forced to confront his own biases. The partnership evolves from one of mutual annoyance to a deep and trusting bond as he discovers that Naomi herself is a highly advanced, illegal android. His initial horror and anger at this revelation gradually give way to a profound understanding and romantic affection, challenging his previously held notions of humanity and personhood. His primary motivation shifts from routine police work to protecting Naomi from the corporations and government forces that seek to dismantle her for being a forbidden model.

In the story, Chris functions as the grounded human counterpart to Naomi’s superhuman abilities. He represents the viewer’s entry point into the world, grappling with the same ethical questions about artificial life. His key relationships center almost entirely on Naomi Armitage, whose fiery determination and authentic emotional responses break through his hardened exterior. He also interacts with a veteran detective named Watts, who serves as a mentor figure and provides Chris with advice and pragmatic support from the police department’s background. Another significant figure is the mysterious Dr. Asakura, whose actions regarding android rights force Chris to reassess the political landscape of his society.

Chris’s development throughout the narrative is a journey from prejudice to acceptance. He begins as a man who does not consider androids to be alive, referring to them as machines, but ends as a defender of their rights and a loving partner to one. This transformation is not immediate; it is punctuated by moments of betrayal, doubt, and reconciliation, making his final commitment to Naomi a hard-won emotional victory. While he lacks the superhuman strength or agility of the Third Types, Chris is a capable marksman and a competent investigator. His most notable abilities are his resilience, his practical survival instincts in the dangerous cyberpunk underworld, and his steadfast loyalty once trust is established.