But it is not like Roxas can do anything about that. He combined him self with Sora for keeps like it was ment to be. I would not call him his alter ego because a alter ego is the same person just using an identity to hide thier real name, like a super hero or something. I don't think he is his personality because he does not control Sora's actions and such. If Sora never stab him self with the Keyblade to release Kairi from his heart, which took out his own heart, Roxas would of never been created. So he could not of been his personality early on in Kindom Hearts. But I do agree that he is still within Sora and some of Roxas's feelings and memories may have some affect on Sora, but I only think of it as emotionally. I think Sora may remeber certain stuff that Roxas did though. But he probably don't know why though. Thank you for answering my question though.
So Roxas and Sora is one? They were two seperated beings know rejoined as one like they are supposed to be.