[quote=@PerseusArchean]
[@Lmpkio] A couple things about the history:

These aliens are the first aliens to show up to Earth, as far as anyone knows anyway. Dunno about the extraterrestrial threats you mentioned.

The various monsters... many were slain in the War of Immortals, and the ones that survived were mostly absorbed into Occus' domain as God of the Supernatural. Before the war monsters would still have been wacky so that's okay, but after it things became a bit more orderly.

We're going to need a defender of the planet though, even if things get a little... unstable, and also totally [REDACTED]. :D Spoilers everywhere! I can't say anything anymore!

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Aliens equals the likes like... oh idk, King Ghidorah, Gigan... you know, those guys. Gojira's history is also entwined with that of the Godzilla series as a whole. Not ENTIRELY, but partially. I can get rid of it if it comes to be, after all its only other stuff so no big deal.

And a defender you shall get! Although she's more of an anti-hero at first glance, provide her and her opponent a common enemy, and you'll have a powerful ally by your side.