Richard Poshard provides the voice for the Wogglebug. Up until Cynthia Hanson approached him for the role he had never heard of the character or read the Oz books before. Cynthia Hanson believes he is so perfect for the voice not just because he is so talented but also because he is a lot like the Wogglebug in his own personality.
The character of the Wogglebug comes from the book "The Marvelous Land of Oz" by L. Frank Baum. The original sequel to the book of "The Wizard of Oz." But Cynthia Hanson felt the Wogglebug was always out of place there, and was robbed of a chance to be a hero and grow for the better as the series progressed. Hence the inspiration for this movie and the series to follow.
Cynthia Hanson added two original elements to the Wogglebug's tale of origins from its original source in L Frank Baum's book. That the Wogglebug is actually a human insect hybrid creation of Professor Nowitall which was why he knew what the Wogglebug was when the students didn't. Also that the word "woggle" means wisdom and love in a collective sense and implies it goes one way or the other depending on which is emphasized or neglected most.
Cynthia Hanson wrote the first draft of the screenplay and Richard Poshard assisted in the rewriting of it after Cynthia received feedback on the dialogue. It was Richard who came up with the idea of the Wogglebug telling his backstory in song.
L. Frank Baum may have been inspired for the Wogglebug's origins from a Lewis Carroll story called "Sylvie and Bruno" which featured another insect who was magnified on a screen and kept his new size. Though the character of Sylvie in this film is not named for that story, it is an incredible coincidence. A further incredible coincidence is that Richard Poshard, who provides the Wogglebug's voice, was known in college (and still known to his close personal friends) by the nickname Bruno.