Do you think Namine, Xion or Roxas will make an appearance in future games?

I did, roxas and namine both rejoined there original selves, its not the same situation as characters like Lea who's nobody died.

 

Then you already know they have hearts of their own and are inside of Sora and Kairi just like Ven's and Xion's, they didn't rejoined their original selves, they are completely independent and aware of their situation, in fact them being like that was what almost drove Sora into Darkness and almost made him be turned into a vessel for Xehanort. The only thing they're lacking is a body of their own, but that can be easily fiixed by having a replica body being created for them and putting their Hearts in there so that they can with time shape it to look like themselves, like Xion's Heart did with her own Replica body, or by having the Hearts themselves make a makeshift body like Sora's did between the end of KH1 and the begining of KH2 when he got his real body back.

 

Besides we already know that one of Sora's mission in KH3 is to find the Key to Return Hearts to save all those that where lost because of Xehanort, that means that we're almost 100% sure that Xion, Roxas, Naminé, Ven and Terra will all come back in KH3.

Then you already know they have hearts of their own and are inside of Sora and Kairi just like Ven's and Xion's, they didn't rejoined their original selves, they are completely independent and aware of their situation, in fact them being like that was what almost drove Sora into Darkness and almost made him be turned into a vessel for Xehanort. The only thing they're lacking is a body of their own, but that can be easily fiixed by having a replica body being created for them and putting their Hearts in there so that they can with time shape it to look like themselves, like Xion's Heart did with her own Replica body, or by having the Hearts themselves make a makeshift body like Sora's did between the end of KH1 and the begining of KH2 when he got his real body back.

 

Besides we already know that one of Sora's mission in KH3 is to find the Key to Return Hearts to save all those that where lost because of Xehanort, that means that we're almost 100% sure that Xion, Roxas, Naminé, Ven and Terra will all come back in KH3.

Sounds a bit far fetched to me, in Kh2 namine and roxas rejoined Kairi and Sora. I dont think it said anything about that being the reason for sora almost becoming a vessel for xehanort in 3d either, there is a fine line between interpretation and fact.

Sounds a bit far fetched to me, in Kh2 namine and roxas rejoined Kairi and Sora. I dont think it said anything about that being the reason for sora almost becoming a vessel for xehanort in 3d either, there is a fine line between interpretation and fact.

 

They rejoined them but never became part of them, their Hearts are still inside them but they're separated from their own Hearts, they're not like Axel that fused into Lea's Heart and became the same person. It's not interpertation, go play the game again and pay attention, Sora was chasing Xion, Ven and Roxas's "hurt" and was falling deeper and deeper into darkness but they where trying to warn him but he never understood what they where trying to say, Riku actually talked directly to Roxas, Ven and Xion when he went into Sora's Heart to get him back. If you still don't believe me then go track down Nomura's interviews where he outright confirms what I'm talking about.