It's no major secret that the Roger fans know and love is voiced by actor and comedian Charles Fleischer. Prior to working on "Roger Rabbit," Fleischer was a frequent face as Chuck on the sitcom "Laverne & Shirley," and had a role in the very first "Nightmare on Elm Street" (via IMDb). However, these were live-action appearances, very different from the mixture of cartoon voice acting and live-action cinematography that occurred in "Roger Rabbit."
In fact, the filming process of "Roger Rabbit" was so unique that Fleischer and co-star Bob Hoskins developed a new kind of acting just to make it work. In an interview with Jay Leno, filmed shortly before the release of "Roger Rabbit," Fleischer explained this new acting method in detail. Oddly enough, it involved him wearing a bunny suit on set.
"[Hoskins said] 'What are you doing!? You're off camera! What are you wearing a rabbit suit for?'" Fleischer explained in his best Hoskins impersonation. "But two weeks later, he thanked me. Because we had to do a new style of acting. He had to act with empty space, where Roger would be drawn. I stood off camera wearing Roger's suit ... and watched whatever Bob did. So, if he lifted Roger by his ears, I'd have to react to that."