Honestly, I still LOVE first season MS Fozzie. The deep voice, the laid-back-ness. He actually thought he was funny and was oblivious. The more taupe fur color was appealing too. But beyond just the voice, there's a whole performance aspect that we're so accustomed to relating to. That's one thing that puppets have all over animated characters. One performer (mostly). Animated characters are put into motion by a plethora of artists. Their movements are times to a soundtrack or a dialogue track or an effects track. With puppets, they actually develop their own "body language" through the performer.
As human beings, we are mentally hard-wired to read body language and interpret it for each individual we encounter. Every individual has a certain baseline body language vocabulary, but the subtlties of that language are what allow us to be so much more intimate with them.
For example: I have a friend who laughs loud and heartily. When she does, you know that she's truly laughing and has found something very funny. She throws her head back, opens her mouth, laughs with boisterous peals, and then cuts short to return to a short giggle as a finisher. But her "laugh" isn't just that. Its the look in her eyes, its the unconscious position of her hands, it's her posture. If that subliminal stuff changes... it just doesn't read like she's truly found some thing funny.
If someone actually tries to imitate her laugh... and they've tried... it just doesn't come off right. Even the best impersonators, when they hit the volume and pitch, can't consciously copy the intrinsic body language that is uniquely her own.
I dunno...maybe I'm failing at my example. I hope it makes some sense.
But what I'm saying is that assuming these characters takes something more than just nailing the voice part. Even when a character is at rest, they are telegraphing a body language. They are telling us who they are.
I'm not saying that getting that perfect is possible or even necessary, but there is a certain amount of discomfort on both sides of the puppet, audience and performer, while they get to know each other again on that subliminal level.
Wow...can I yammer or what?
-Gordon