Rivett belongs to The Mechanists Crew and while he's the only Mechanist viewers see, he isn't their leader. According to him, his dragon is Libris, but he lies often enough to get what he wants and so whether that is true or not is up for debate. Rivett presents himself as a controversial character and prompts both the audience and characters of the show to question what wrong and right really mean. He did this in Episode 31: No Paynn, No Gain, pointing out to Artha Penn that breaking into the Academy is a crime, yet his intentions behind the crime are good. He makes Artha understand that any situation is never just black or white.