Jamie - didn't just knight brienne, he asked to fight under her command. That's the respect she deserves. Cersei wanting to kill him, tyrion talking to him, I think his arcs are all wrapped up. Likelihood of death - high
Brienne - did she avenge renly, protect the stark girls, get a satisfying conclusion to her relationship with Jamie, and become a knight? Yes? Ok, it was a good run. Likelihood of death - nearly certain
Beric needs to do a good job fighting with his flaming sword, i guess, but he's done enough to justify his arc. The LoL brought him back a bunch and he helped get the hound and a bunch of other important characters into the fight... possible that he's got a bigger role to play but also possible that he's done. Likelihood of death - all but certain
Mellisandre's whole reason for existing is to get the prince who is promised into the big fight at winterfell. She just didn't realize which big fight. She didn't show up earlier because jon and co said they would kill her if she did but she needs to bring reinforcements and see the fiery sword, then she'll die in westeros as she planned. If she doesn't show up ener again, then wtf was the point of her character still being alive? Likelihood of death - near certain
Danny could die and consider her arc complete. She hatched the dragons and brought them to the fight, she saved jon snow and all the other brave warriors who did the dumbest thing ever, and brought two big armies to the fight. She's also the "last dragon" - if they kill the night king and his zombie dragon and he kills her and her dragons then that's the end of the fire and the ice. Likelihood of death - pretty high
Bran - same thing i guess. Wouldn't bother me at all if he died when the night king died, or if the night king died when he died. They're obviously connected, and he's literally using himself as bait. Likelihood of death - pretty fn high.
Podrick - need him around to sing good and sling wood. Likelihood of death - better be zero
Gendry - did they use his king's blood? Yup. Blacksmith ability? Sure. Willingness to pork a girl he met when she was 12 and he thought she was a boy but now she's a super knife throwing staff swinging sword fighting knife wielding face wearing assassin? Yeah. Hammer swinging? Sure. Ability to row a boat really slow? Uh huh. Ability to run real fast? Yeppers. He's served most of his purpose although technically he could be the pwwp. Likelihood of death - could go either way.
Arya - what a waste if she dies now. She did get some good pun opportunities, from arya a boy or a girl to the gendry reveal, but if the only purpose of all the faceless man stuff was to kill a cranky old dude and his merry band of incompetents, i'll be disappointed. Likelihood of death - low
The Hound - he's had his redemption arc for everything but throwing that rock on the ice. He owes us more, but we might not get it. Likelihood of death - 50/50 maybe a little lower.
Sansa - has the lady of winterfell survived all this time just to die in the crypt? I hope not. I could see a callback to the Blackwater scene where they considered suicide and she sang songs to keep the ladies calm. Maybe her role in the crypts is to be stronger this time. She's wearing armor now after all. Likelihood of death - slim but possible.
Tormund and the wildlings, grey worm and the unsullied, and, uh, jorah and the dothraki? I feel like all 3 armies are going to get rocked, and those guys are the faces of their respective armies. If i had to guess, tormund dies without ####### brienne, Grey worm without moving south with miss sandy, and jorah without getting to shout khaleesi one last time. Likelihood of death - pretty high for all 3
Tyrion - needs to go back to kings landing to see Bronn and Cersei. Likelihood of death- slim
Onion knight - he's outlasted his plot arc already but now it's down to him seeing mellisandre be right and her still dying before he dies. I don't think the story needs him to get to its end. What would he have left to do, take out yuron? I'd be fine with that as long as it's quick and painful. Likelihood of death - pretty high
Oddball idea - Jamie dies, arya doesn't know that him and Cersei broke up so she cuts his face off and wears it to king's landing, bronn shoots her.