Don't be afraid to look silly.
Start as early as you can. Make tapes of your characters.
I didn't record any additional dialogue for this CD, they are excerpts pulled from existing episodes.
If I am not right for something there are many talented actors out there that will get it.
I usually have 10 different animation projects going at a time.
I had to make squirrel noises as Bubbles and without realizing it, I was making the face and putting my fingers up to my face to look like a squirrel and everyone made fun of me for the rest of the day.