
The one that comes straight to mind is King Ghidorah. If you're going off the Monsterverse version, how would Venom interact with Ghidorah as its one body with 3 individual minds?
Something to remember about Venom is that the emotions of the host influence the Symbiote, so other pure good monsters like Mothra could instead work together with the Symbiote for the good. Then again, the Symbiote is an alien lifeform and therefore disturbing the balance of nature so maybe not.
Also, I just wanted to mention that Venom with SpaceGodzilla as its host would be the most terrifying thing ever.
Long live the king...

I don't think the kaiju need that symbiote, they're already more powerful than it

Xenotoris it’s just a what if scenario
Angering the Godzilla fan base one take at a time

I know that's why I said the thing I said because doesn't Venom also breaks down its hosts? A power that would eventually takes you over and eats you seems like a huge disadvantage in a fight

Xenotaris it doesn’t eat it’s host it eventually takes over their body. The host’s body basically becomes a puppet of the symbiote of worn to long.
Angering the Godzilla fan base one take at a time

I'm pretty sure I heard that the symbiotes break down their hosts or was that only exclusive to the Venom movie?