Eddie Borrows is a supporting character employed by the Martian Police Department (MPD), where he works alongside colleagues including Ross Sylibus, Naomi Armitage, and a fellow officer named Larry, who appears to be his direct superior. As a member of the police force on Mars, Eddie is portrayed as direct and casual in his demeanor, often unable to resist making misplaced or inappropriate comments during official meetings. This tendency frequently draws reprimands or exhortations from Larry, to which Eddie regularly concedes.

Despite his unabashed and sometimes unprofessional way of interacting with his colleagues and boss, Eddie possesses a fundamentally good-hearted nature. His big mouth and offhand remarks are balanced by his reliability and dedication when it comes to job performance. His motivations are aligned with his sense of duty, as he and his fellow officers are determined from the beginning to solve the case involving the slain Thirds, a group of advanced androids.

Eddie's primary role in the story is as a supporting member of the police team, providing technical assistance and backup to the main characters. His notable abilities lie in handling encrypted data, which he can decipher with considerable skill. This technical work sometimes requires great patience, a quality he maintains by smoking cigarette after cigarette as he works through complex decryption tasks. Throughout the course of events, Eddie demonstrates consistent support for his team, proving that regardless of his casual attitude and misplaced commentary, his heart is in the right place and he can be counted on when needed.