Fillerbunny
In the comics, Fillerbunny is a pink bunny genetically engineered to be unceasingly entertaining. He is made to undergo all sorts of painful procedures and sadistic experiments. If Fillerbunny dies, he is revived. He is made to entertain the audience for however long he is needed. Fillerbunny's two greatest wishes are to die and be released from his miserable existence or to have something that makes him happy in his life.
Due to the popularity of this character, Vasquez created a series of full-length Fillerbunny comic books, published by Slave Labor Graphics. They are Fillerbunny in "I Fill Up 15 Pages!", Revenge of the Fillerbunny, and the upcoming Fillerbunny in "My Worst Book Yet!" (released in March 2005). In his introduction to these books, Vasquez tells how he created the first one to meet a publishing deadline requiring him to come up with 15 pages and the second one took two nights for similar reasons.
Fillerbunny also appeared in two pages of Vasquez's I Feel Sick series, and made brief background appearances in Invader Zim.