1) dude, king Ghidorah should totaly play Xerxes, or whatever the persian king's name was. i mean, KING Ghidorah, and he came back from the dead HOW many times?
2) Destoroyah? meh... always saw it as a mindless monster.
3) clover wasn't evil, just in a WTFOMFG mindset, and not particularly aware of the humans (with the possible exception of the ones shooting at him).
3 1/2) kings caesar and/or kong should represent the spartans historical allies, the Athenians. (counted as one-half due too its comparatively small impact)

You forgot one monster by the name of Konga, which was also the name of the movie and he is england's verson of King Kong.

Please update again soon & thank you.