I think Xion is just a mix with Kairi and Sora. Because from Kingdom Hearts Kairi's heart was in Sora. Then Sora released her heart and his own. She wields the keyblade becuase of Sora and gets just about everything else from Kairi. I wouldn't know about her attitude though.
Is Xion supposed to be the nobody of Kairi and Sora. Because in kingdom Hearts 1 Kairi's heart was in Sora. Then Sora released her heart as well as his own at the same time. Not to mention she has a Keyblade. So she mabey the nobody of Kairi and Sora
