My favorite, as you might guess, is Gonzo. I think he really embodies much of the silliness that makes the Muppets great. I also have soft spots for Kermit (I agree--center of the Muppet Universe) and Fozzie (endearingly insecure). As for minor players, I love Pepe, Statler & Waldorf, and Beaker. Wow, it's hard to choose!