General Hux
After having potential in The Force Awakens, Hux was relegated to a laughing stock in The Last Jedi. Any gravitas he might have possessed with his troops evaporated when Kylo Ren became the new Supreme Leader. If rumors are true, Hux will either turn traitor to the First Order outright, or will be captured and turn on the boy-Sith to lessen any punishment he might receive. For better or worse, the weasel always survives.
Prediction: 98% chance Hux will survive Episode IX.
Chewbacca
All I’m going to say is this: If Chewie dies, we riot.
Prediction: 100% chance of survival