 Johnny the Homicidal Maniac (one of Jhonens comic book characters  with quite a loyal fan base) gets several references throughout the  series. He appears twice in "Halloween Spectacular of Spooky Doom"  with bright purple eyes and striped horns and has been lovingly  dubbed "Nightmare Nny" by fans. In "Tak, the Hideous New Girl", Tak  wears his boots.