Rod Kimball operates as a synthetic partner to Basil "Buzz" Nikvest in the covert Branch division of the A.D. Police, investigating Boomer-related crimes in Megatokyo. Though a Boomer himself, regulations restrict him to the unofficial rank of Sergeant. Together, he and Buzz tackle cases involving rogue Boomers fueled by illegal narcotics, Boomer prostitution rings, and anti-Boomer terrorism.

Kimball displays distinct perceptiveness and human-like qualities, even discerning Reiko Michaelson's hidden romantic feelings for Buzz. He sometimes asserts Boomers lack souls, yet his consistent actions reveal deep compassion, empathy, and sharp observational skills. He engages in natural banter with colleagues and employs tactical deception during investigations. His character confronts artificial personhood, especially when facing the exploitation of Boomers within the sex industry, where they are viewed as mere tools.

His journey culminates in a final sacrifice: Kimball dies shielding Reiko from an assassination attempt involving a helicopter. This act underscores his role as a bridge between humans and machines, embodying the series' thematic conflict over humanity's definition. His portrayal parallels characters like Data from *Star Trek*, emphasizing a synthetic being's quest to understand human experiences.

Kimball functions within a team under Chief Takahashi, collaborating with specialists like Reiko (weapons/vehicles), Angel Lynch (undercover), and Bill Myers (tech). His relationship with Buzz evolves from initial skepticism to profound trust, influenced by Buzz's personal Boomer-related trauma. Kimball's insights into both human behavior and Boomer psychology prove critical in numerous investigations, establishing him as a nuanced figure within the Branch.