Goblin

Goblin is a one-time character that appears in the Rugrats episode "Curse of the Werewuff". He is is voiced by Jeff Bergman. He is actually an adult human male, presumably an employee at the Screamland amusement park, dressed up in costume to scare children inside the kiddie haunted house. Despite his job, he means well, and seems to enjoy having fun with them, faking being scared of the main babies' costume and letting them playfully chase him away.

Gallery
You can find Goblin gallery here.