The late Casey Kasem, perhaps best known as the voice of Shaggy from Scooby Doo, was vegan. He once walked out on the role when Shaggy & Scooby-Doo were to be portrayed in a Burger King commercial, and only returned when the producers allowed the character to be vegan!
"Some of the things that I do, I think are very important and much more important than the radio show or the television show that I do or anything else that I do. I think right at the top of the list is the basic thing. And of course the basic thing is to hopefully stop people from killing anything. And to create a non-violent diet for themselves, because a non-violent world has roots in a non-violent diet."