Well, I basically am Kate in terms of looks, and her voice is similar to mine, just higher pitched. Lower it a bit and add the sultry thing and Lucy's kinda easy. I'm trying to teach myself Nicky, if only because for some reason I seem better at it than Ernie.
In terms of Muppets, Red and Mokey I have had practice, uh, practicing. I'm better at Baby Piggy than I am Adult Piggy.