After complaints about the original pre-production character models' appearances, including an internet petition of protest that was started by an eleven-year-old boy, the producers of the series revised and softened the characters' appearances to make them appear less menacing.
The original name for Wile E. Coyote's superhero character was "Slick" before changing to Tech E. Coyote.
The original name for Tazmanian Devil's superhero character was going to be "Spaz B. Wilde" and then it was changed to "Spaz-manian 'Spaz' Devil," and finally the name was changed to Slam Tasmanian.
The original name for Bugs Bunny's superhero character was going to be "Buzz Bunny," but then Buzz Bunny was already trademarked by a Dutch freelance designer, so the name was changed to Ace Bunny.
The original name for Road Runner's superhero character was going to be "Roadster" but then it was changed to Rev Runner.