Ronnie Sloan is a radio DJ who appears in the episode Less Talk, More Monsters. He hosts a contest where $50,000 are hidden somewhere at the dump, which is where the Monster Academy is located, putting the monsters in danger of the humans finding their location.
When the trio call Ronnie's studio and Krumm talks to him to get him to remove all the humans from the dump, Ronnie decides to instead have the humans dress up as monsters, so they can all win a free KDMP t-shirt. He appears to find monsters funny, since he asks his engineer Steve if he's ever seen a monster, before they are both scared by Ickis and Krumm, forcing him to run off. Krumm then talks on the microphone to inform all of the humans that the money isn't at the dump, but at the KDMP studio, which they angrily go to, thinking they were all lied to. The humans all confront Ronnie, who is forced to give some of them 34 cents, a ticket, and a picture of his cat. He tries hiding behind his desk, before the police come. What happened to Ronnie afterwards is unknown.