The Official "We Hate Kiari" Fanclub agrees 100% that Kiari should die.
I'm disappointed, Charge.
PS. IF u pick kairi than pick a second choice!
Pfft. That would actually be giving her plot meaning and importance, not to mention make Sora accidentally look like he actually cares.
Seeing how they've refrained from doing it thus far, I will too.
Then Kairi, without either of them, slits her wrist...
She's too self-centered and ignorant to go the distance.
she'll probably just pout and say "NO! I WON'T LET HIM GO!" while Sora's about to off himself and run towards him, stepping on Riku's still warm body on the way over.
Then she'll convince herself he'll be coming back one day because from the impact of it all they never found the body and resume doing what she does best -
Waste her time pointlessly on Destiny Island, waiting for the hero that will never return to her unless Riku's nearby.
Riku's dead though, so not even Sora's ghost will bother.
Onwards to on-topicness then.
As far as main deaths, Riku and\or Sora all the way. One of them kicking the bucket will no doubt get the other into a frenzied fit of rage and his death will be soon to follow.
I'd actually... well, I'd like to see Namine die if the issue ever arose. If they go down the path of "they never fully fused, she's not fully Kairi's Nobody, she needs to be offed for things to be set right" it's possible.
I'd love to see how Sora - having rememebred her - would react to her sacrificing herself in no small part for him.
As far as side deaths go -
Though they'll never do it, Minnie. I think killing someone close to Mickey woudl create more of an impact, because that would
change Mickey and he in turn will change everyone around him.
Also, Leon, or on the same notion as Minnie to Mickey - Yuffie. Leon would strike closer to home for Sora though and would mean Radiant Garden would be left without its unappointed leader.