Good question! As far as the classic Muppet gang, I'm actually quite a bit like Fozzie, but I think there's also a little bit of Rowlf in me.
I can very much relate to Big Bird too though. I guess my inner-child is like him. Always asking questions, always wanting to do things right. Big Bird was pretty philosophical. He was always thinking and questioning life. When things don't go quite as planned, I get bummed and so does the Bird. He also looks at the world very innocently. He always wants to be friends with everyone. So many things in Big Bird that I can relate to. I was very much like him when I was 6.
There's also a lot of Kermit in me, but I think there is a part of all of us as Muppet fans that is Kermit.