The character was an important influence upon the development of the movie Bambi which started production with an adult tone which seemed too serious and noncommercial. As voiced by the young actor, 4-year-old Peter Behn, the vivacious character of Thumper was expanded from its original minor role and led to a focus upon the young animals in the story.
The character Thumper first appears in the film Bambi, watching as Bambi is first presented as the young prince to the creatures of the forest. He remarks that Bambi is "kinda wobbly" but is reproved by his mother who makes him repeat what his father had impressed upon him that morning, "If you can't say something nice, don't say nothing at all". This moral is now known by such names as the "Thumperian principle", "Thumper's rule" or "Thumper's law".
Thumper appears as an adult, and is with Bambi and Flower when Friend Owl warns them of the dangers of being "twitter-patted". The three walk off with the intention to not let it happen to them, but Thumper soon falls for a female rabbit named Bixbi. The end of the film shows that he and Bixbi have a litter of baby rabbits.
In Bambi II, Thumper again appears hiding from his sisters and trying to help Bambi learn to be brave in the hopes of impressing his father Thumper is the main protagonist in a video storybook, Thumper Goes Exploring, which was released with the Platinum Edition of Bambi on March 1, 2005.
Thumper makes numerous cameo appearances in the animated series House of Mouse.
Role in the series
Thumper reprises his role from the movies, and is now an ally to Spongebob and the Shell Logue Squad.