....Will Ansem the Wise be with her? I mean, it'd make sense that he'd stay with someone who could protect him from the heartless. Not to mention, that it'd also benifit both of them to stay and communicate with each other, rather than staying alone and going insane from loneliness(Aqua also succumbed to that before Terra and Ven's keyblades came out of nowhere). It makes more sense for them to stay together then just leave each other, if they are both trapped there.

I think Ansem the wise will join them after we learn some shocking secrets about him.

Is it even possible for people to die in kh?

Yes, if they are supposed to die in the Disney movie. (I guess Maleficent is the exception to that)

 

Honestly I hope both Ansem and Aqua would stay together in the realm of darkness so both are rescued at the same time. But who knows. Though I actually like the idea someone said about having Ansem staying in the realm to help all those who get trapped in there.