Elmo

Elmo is a character from the Kim Possible Comics. He is an original character, not originating from any outside source material. However, both Elmo and Cookie were the central characters in a series of books written by Michael and Joseph Newman when they were much younger. These books are referenced in both [http://kp-comics.wikia.com/wiki/(Lions_and_Tigers_and)_Bears_Oh_My! " Lions and Tigers and Bears Oh My!"] and "Guests Galore (Many Guests)". Elmo is one of the central characters in The Lord of the Marshmallows, but after that series, he will not appear again until LOST (with Dinosaurs).