With so many kaiju coming in, it's not about if they fight, but when.
In the immortal words of Dr. Ishiro Serizawa…
With so many kaiju coming in, it's not about if they fight, but when.
Okay I came up with a better and marginally less derivative monster idea, if this is still accepting them.
It's a radioactive dragon.
Now I know you're going to say "hey that's just Godzilla" but bear with me. I meant this thing is an active radiological monstrosity in a way that Godzilla is never really presented. Radiation seethes off of this thing in invisible toxic waves, and its heart is a burning nuclear reactor, like a stellar core. Also more emphasis on the Dragon part, as it fully resembles a winged dragon.
I think this thing is going to be an alien of some kind; a stellar parasite that lives on the surfaces of stars and feeds on their fusion-bodies.
Here's the sample art.