[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.

[Inkspot] (APPLAUSE!) Not Beagle 2.

[D] You may well be right about my answer to "mythical?". Since I had already said that the answer was fictional, I interpreted 'mythical' more narrowly. But one definition of 'mythical' is 'fictitious', so perhaps I was misleading. As for carnivore, I recently saw an episode of Lois and Clark (not my fault; my daughter is currently Superman-obsessed) in which Clark Kent ate a hamburger...

[Cdm]I would agree with you on your interpretation of 'mythical'. Superman could not be described as a mythical creature or person.

[I] Yes. (More applause! )

Not the Star Trek variety.

[Projoy] Not Voyager.

I'd agree with CdM too, particulaly as Superman is a member of a particular (fictional) species. Is one difference between fiction and myth that a fiction has a specific author, but a myth doesn't? (Although that would make Robin Hood mythical rather than fictional, so hmm...)

[I] Not the Tardis. (the audience look glum)

I don't agree with CdM, Superman is an omnivore rather than a carnivore just like Ordinaryman.