Shelby

Shelby makes his appearance in "My Two Favorite People" and later returns in "Video Makers." He can talk and lives in Jake's viola. He gave an idea to Jake, which is to spend more time with Finn and Lady Rainicorn at the same time. This leads to the events of "My Two Favorite People." He has the same tone of voice as Manfried. He also made a cameo appearance in "What Was Missing" when he crawled in and out of Jake's viola, and narrated the ending of "Holly Jolly Secrets Part II," where he and the general cast watched videos and wore sweaters. During the winter, he is known to wear a green sweater with two candy canes on it. Shelby speaks in a high pitched tone, which also sounds perpetually sarcastic.

It should be noted that Shelby appears as an earthworm, which are androgynous. However, he is a male as confirmed by Pen Ward.

Appearance
As the picture shows, he's a worm. However, unlike the other worm characters, Shelby more closely resembles an earthworm in color and shape.

Quotes
See Shelby/Quotes 

Trivia

 * Pendleton Ward does the voice of Shelby and then it is computer generated for the show.
 * Shelby was the answer to one of Gaia Online's ten trivia contests to answer to try to win a first season DVD set.