Gary is the manager of Joe's Roastery, and Rat's direct superior. He and Rat have a tense relationship; legally Gary is not allowed to fire Rat because of the corporation's diversity policy, and has only been able to do so when a group of clones got hired. Rat also enjoys antagonizing him, and has even considered killing Gary.
Gary appears to be very devoted to his job, considering his career path to be very rewarding.  He is also very easily irritated, mostly by Rat's attitude, and is constantly annoyed with the amount of disrespect the rodent gives him and the customers.