[Irouléguy] Excellent summation. Minor clues: I would not put too much emphasis either on newspaper cartoons or written fiction.
[Dandalf] Well, we can discuss that when the round is over. :-)
19th Century? No.
Lewis Carroll? No. *some smiles in the audience*
Adult audience? That's not really the target market, although many adults like at least some incarnations.
Hobbes? No.
A clue: When I set this AVMA I expected a question to which I could give a correct but misleading answer. And you fell right into my trap. Mwahahahaha!

Human form? Yes! *applause*

Superhero? Yes. *applause*

Superman? YES!

As for "mammal", my uncertainty was the following. As far as I know, Superman has all of the traits that are usually taken as defining a mammal. But I think that the strict definition of the term has an evolutionary basis, and thus cannot apply to someone not from earth. I expect to be corrected by either a biologist or the morniverse equivalent of Comic-Book Man from The Simpsons.

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[CdM] Mostly metal? Yes.
[I] Not an engagement ring.
[Rosie] Manufactured? Yes.

[GL] Bigger than a phonebox.
[Néa] Unique.

[Phil] Not a sculpture.
[I] Not in the U.K. (the audience is amused)

[Davdand] Not the Eiffel Tower.