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Cenobites are bad, there's actually a large host of different Cenobites if you read Clive Barker's comics and books. Actually, at least as many as there are demons and devils.
Remans? Naah, to much like Vampires.
Sabretooth or the Hulk? Technically not monsters.
The Gorgonites from Small Soldiers? Um... Diminutive Constructs?
The witch from the Little Mermaid?
Klingons?! Tibbles? Smurfs?
Remans are a humanoid, and thus not technically a monster,
Sabertooth and the hulk are mutants, and thus not monsters (Swamp Thing is a monster though, so it's a fine line...)
The Gorgonites are small monsters, but they're monsters.
Ursula is technically a monsterous humanoid...
Klingons, see the answer for the Remans
Tribbles are not monsters, they're legless hamsters...
Smurfs do not count as monsters.
But wait until the topic gets started tomorrow before saying what you want to do. You can stat planning though...
Who knows, if this is a success, we can make it an annual feature...