What other Titan/Kaiju would you add if you made KOTM ? (Only 1)

If we're going by MonsterVerse creatures, then Titanus Leviathan or Kraken. But if I could manage it, I'd probably slip Anguirus or Baragon or Varan in there somehow.

Gigan

I'm with Xenotaris. g i g   a     n

And how exactly would Gigan fit into the story?

^

I would go for Mokele-mbembe

Gigan would be awesome... so would Destoroyah... and Biollante... They'd all fit really well. But I have to go with 

Keizer Ghidorah

... or Desghidorah

Imagine what having other Ghidorahs could mean! It'd mean there could be a whole planet of them! A whole herarchy! It could mean a whole war between the Earth Titans and the Ghidorahs, or against a single, extremely powerful version of Ghidorah!

TheLazyFish Or how about a war between different species of Ghidorahs?

Monster X/Keizer Ghidorah was going to be my first answer but Gigan would be great if they introduce advanced alien civilizations. Essentially being a more advanced rendition of Mechagodzilla, being complete cybernetic with both synthetic and organic parts harmoniously blended together

I have to agree with lazy.It would be an interesting setup.

JurassicKaiju14

That'd be fucking amazing!

Q : Titanus Qetzalcoatl.

Y'all know that old movie at least needs a "Q2".

Ooh, one more, Titanus Tetanus. Ouch!

~Rift Rat.

I'd probably put in Anguirus. Since he seemed to be teased in Godzilla's undersea lair, I would theorize that there was, in fact, a monsterverse Anguirus, but there is one thing wrong with this theory: How did he die? Did he die many years ago? And to who, or what did he die to? Anyhoo, I would expect that he would have the same symbiotic relationship that Godzilla has with Mothra in KOTM. 

King Caeser