Okay after looking at the new information regarding 358/2 Days and Birth By Sleep. I don't think that Xion's is Kairi's nobody or Aqua's body. In fact, I think that Xion maybe actually be similar to LS, in a way. But unlike LS, there is a possbility that Namine would have erases or blocker her memories or that she has been around for so long that she herself (or it's self) has forgotten who she really is.
Note this is just a theory that's been bugging me as of late, so opinions?
Note this is just a theory that's been bugging me as of late, so opinions?