Wow, it's so nice to see a thread full of other non-visual authors. I'd been firmly convinced that I was abnormal because of it.
I honestly don't really care what my characters look like. I decide a few things as it becomes important in the story and toss it in and make it consistent, but leave it up to the reader to form any picture they want. The most I do with actors and my characters has nothing to do with looks, it's all about prescence. So-and-so or Such-and-such would be able to portray this character--but with modern make-up and prostetics, it doesn't matter what the actor looks like anymore, as long as s/he can pull off the role.
I honestly don't really care what my characters look like. I decide a few things as it becomes important in the story and toss it in and make it consistent, but leave it up to the reader to form any picture they want. The most I do with actors and my characters has nothing to do with looks, it's all about prescence. So-and-so or Such-and-such would be able to portray this character--but with modern make-up and prostetics, it doesn't matter what the actor looks like anymore, as long as s/he can pull off the role.