Luke comes back as a Force ghost to annoy Kylo Ren and give snarky advice to Rey.
Leia dies off-screen after time passage. Her death is mentioned in the opening crawl and she is mentioned fondly in dialogue.
Rey loses a fight…actually, no. Rey wins. It would be out of character for her to lose a fight at this point in the sequel trilogy. She could lose a limb.
Hux betrays Kylo Ren by making a deal with the rebels. He wants more power but gets killed before he can use it.
Fake out with Snoke’s death. It looks like he’s alive for a minute but not really.
Rose wakes up and stays as technical support on the new Rebel cruiser.
Finn and Poe develop their bromance on a mission on a forest-type planet. BB-8 tags along.
Force ghosts of Qui-Gon, Obi-Wan, Yoda, and Anakin face Kylo before the final fight (sounds like fan fiction, but it could happen).
The Millennium Falcon gets destroyed in the final space battle, Chewie goes down with the ship (and a few porgs).
Kylo Ren loses an arm or leg in the climactic lightsaber duel.
Kylo turns to the light side but dies anyway.
Rey decides to teach the ways of the Force as a neutral path instead of light or dark.
C-3PO has a black arm now.
R2 beeps.