Rod Kimball, a Boomer android, operates as a non-human agent within the A.D. Police’s covert Branch division, partnered with human officer Basil “Buzz” Nikvest. Though denied an official rank due to his synthetic nature, he wields the authority of a Sergeant while investigating rogue Boomer crimes and terrorist threats in Megatokyo.

Initially distrusted by Buzz—whose traumatic past fueled animosity toward androids—Kimball slowly earns his partner’s confidence through unwavering loyalty and unexpected emotional depth. His perceptiveness bridges mechanical precision with human-like intuition, most notably when deducing Reiko Michaelson’s unspoken affection for Buzz. This duality positions him as a focal point in the series’ interrogation of synthetic humanity.

Kimball’s tactical expertise proves vital in missions ranging from dismantling illegal Boomer-drug networks to resolving high-risk crises. Over time, his partnership with Buzz transforms into a camaraderie defined by mutual reliance, dismantling Buzz’s prejudices.

In a defining moment, Kimball intercepts a missile targeting Reiko’s helicopter during an aerial assassination attempt, sacrificing himself to shield her. His death leaves an indelible mark on Branch, symbolizing a transcendence of programming through selfless loyalty. The loss reverberates through his team, profoundly shaping Buzz’s future decisions and Reiko’s emotional journey.