User blog comment:Nitrous X/Theories/@comment-1639093-20100612150356

I really hope Xion is coming back. Then Namine can have Repliku, Sora can have Kairi, Roxas can have Xion, and Riku can have..............Ollette?

Anyhow, I have my own theory on how Xion could come back. Xion's identity came from Sora's memories of Kairi, which she absorbed from Roxas. Before this, she had no face, no identity. She was just a physical, blank being. And when she faded away, she left behind a sea shell. If you were to place this shell by something that embodied Sora's memories of Kairi...say, the Lucky Charm or the carving on the cave wall, then it would transform back into Xion!

Well, there you have it. I also like the idea of the Guardians. It's one I really like the sound of.