There is a great documentary called “I Know That Voice” that interviews many of the top cartoon voice actors about what they do and how they got into the biz. One of the people in the film is my friend Bob Bergen – the voice of Porky Pig and many many many other characters. He is a great teacher too, in case you are interested in learning more about character voices from one of the best around.
This is a short clip from that documentary where Bob explains how he does the voice of Porky Pig. (Thanks to your classmate Hector for reminding me that this was available.)