[quote=@Double]
So, like, do Nobodies remember who they were or don't they? I mean, Xemnas and Xigbar seem to clearly remember their previous lives as Xehanort and Braig. On the other hand, we have Nobodies like Axel and Roxas who don't seem to recall any of their memories. Now, Xemnas and Roxas I can understand since both of them are special cases. Hell, I can even explain away Xigbar by saying the piece of Xehanort he has gives him exceptions to the rules. But then... what about Axel? Or Saix for that matter? If either of them retained any of their memories, they'd have been a hell of a lot more chummy since, you know, they were best friends before becoming Nobodies.
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Actually, from my watching cutscenes, I think that Saix did at least remember his friendship with Axel, and kept trying to revive it, but his sadistic attitude, which in turn came from a piece of Xehanort, wrecked all chance of that happening.

My thoughts are that Nobodies, except for Roxas, do remember their original's memories; that's how they can show emotions even before growing new Hearts.