1. Godzilla2.Gamera3. Creech
However....... can this guy be considered a monster?
No. I'd say the combination of him being both too sentient and really a good guy would militate against him being a monster.
Favorites: Creature from the Black Lagoon and It! The Terror From Beyond Space.However....... can this guy be considered a monster? If so, he's in my top 3. Actually, if you are familiar with the Star Trek episode, he was pretty much a good guy. He's kind of "monstrous-looking" though:
Hmmmm.. the "sentient" part I might agree with although the Phantom of the Opera was quite intelligent. But, aren't most of our beloved monsters "good guys"....