R. Suspect (also known as Ron) is another graduate from Petropolis High School who was only shown in Big Dog on Campus. It was shown that after graduation, he became a successful real estate agent. Apparently, while he still attended school, because of his last name, the police were always at his home. It was also revealed that he had a sister, by the name of Ima Suspect.
- His name is a pun on "our suspect".
- His voice actor is Matthew W. Taylor who is known for voicing Verminious Snaptrap.