Hear me out, The Avengers, but Agent Coulson is the human. Muppet Cap tossing the shield, just imagine. And Coulson's actor I think would be very much like Michael Caine in Muppet Christmas Carol, interacting very sincerely with the Muppets as fellow actors.

I would also accept "Hulk is the human, but only when he's hulked out" just for the sheer surprise of it