Diesel is Kevin's best friend and Fred Figglehorn's bully in the Fred: The Movie trilogy and Fred: The Show. He is portrayed by Carlos Knight.
History
Diesel usually assists Kevin in bullying Fred. In Fred 2: Night of the Living Fred, he teases Fred alongside him and helps him get his sister back when Kevin thinks that Talia was kidnapped by Mr. Devlin.
In Fred 3: Camp Fred, Diesel is shown to be attending Camp Superior and helping Kevin sabotage the competition for Fred's camp.
He typically plays the role of a sidekick and a hype-man for Kevin. He is the most prominent of Kevin's friends in the film trilogy and the show.