Joe Pi replaces Girl One after her death, to a cold reception from his fellow officers. Partnered with Irma Geddon, his skill as an officer and his kindness with Irma's family cause them to quickly become close friends.
As a robot, he apparently experiences emotions but can not display them, and has a sardonic sense of humor. He easily outsmarts and teases bigoted Officer Cheney much to the amusement of other officers. He convinces pedophile Atoman of the Seven Sentinels to commit suicide after he and Irma agree that he will not receive a fair trial.
He is modeled after 1970s Japanese anime Super Robots, most notably Mazinger.