Leeanderthal
Derp Dragon
That'll be something to see. An alliance of Jedi and Sith to combat something that's driving the entire galaxy mad.
Obviously, Katamari.I'll give a hint: They'd be from a game series from within the past ten years.
You are now imagining the prince rolling up brother moons as they scream in futile despair.
This.Can you put me down as a 'No' vote for any crossovers in this quest?
With renegade Imperial warlords and eventually an organised Imperial Remnant, independent polities with there own agendas such as the Hapes Consortium and Corporate Sector Authority, independent groups of Force users such as the Jensaarai, Nightsisters of Dathomir and the inevitable Sith cabals, crime cartels such as Black Sun and the Hutts, and previously unknown alien races such as the Chiss and Ssi-ruuk there are stacks of potential adversaries and complications in the existing Star Wars universe.
The first half of what you described sounds a lot like the Vong.I'd honestly prefer if this story stated in-universe (IU). Going out of universe would make it far more difficult to have good intrigue. People IU have had centuries to build up a list of contacts. Those new alien invaders? They just arrived; it's unlikely they can even communicate, much less perform any credible espionage against us.
I just feel it would needlessly limit what you can write far more than staying IU.