User blog comment:PerhapsTheOtherOne/A New Theory on the Legendary King Ghidorah/@comment-5234191-20141130130731

Uh, thematic pressence? I don't think it means he has to an alien for eternity, as far as I know Ghidorah was a mythical creature in GMK and is not an alien (he wasn't even an evil planet destroying mind controlled beast in there), Godzilla was potrayed as hero, anti-hero most of the time, and a villain throughout times. Just because something usually is, doesn't mean it has to be all the time. There's a certain yet unmeasurable limit where you can alter a character without loosing "the character", and Ghidorah's origin was changed once and it worked just fine. Less successful example would be Zilla who was deviated inside-out so much it became a seperate character.

You can actually make Ghidorah an Earth Kaiju who hold a keystone role in the ecosystem where a wide boundary of natural enviroment could only support one of these things, since they are so powerful and could wipe out an entire population easily. But their few numbers accumulated with their young being killed by other Kaiju species (most likely Godzillas and Rodans, a common tactic to wipe out competition, especially effective ahainst species with very slow birth rate) and their rather rare oppirtunity to spawn youngs, only one left survived and he was THE King Ghidorah, who happens to be a geneticly mutated if you want an extra reason for the unusual number of head he has.

Still a catalysmic beast isn't he? And he doesn't have to be an Alien. Its not that "There's no way" to dismiss the Alien origin, its just hard to picture since most of the time we see him as an alien.