So if Xion's form changes based on who is looking at her (Saix sees her in her puppet form, Xigbar sees her as Ven, Roxas sees her as Kairi with black hair, and Axel often sees her with just a hood on), how does Xion see herself? We never really have many scenes from her point of view: she's almost always in a position where we are seeing her as someone else does. There's the assumption that she shares her sense of identity with Roxas, but really, there's no real reason to support that: as said before, her appearance is almost arbitrary.
So if Xion's form changes based on who is looking at her (Saix sees her in her puppet form, Xigbar sees her as Ven, Roxas sees her as Kairi with black hair, and Axel often sees her with just a hood on), how does Xion see herself? We never really have many scenes from her point of view: she's almost always in a position where we are seeing her as someone else does. There's the assumption that she shares her sense of identity with Roxas, but really, there's no real reason to support that: as said before, her appearance is almost arbitrary.