[He pauses as he considers what to say. This is hard.]
We didn't know about it at the time, but a while ago, they forced Namine to change Sora's memories. She has that power. Then when he went to sleep so she could change them back, some of them got scattered and found their way to Xion. Other ones came through me, to her, because I'm his Nobody.
I don't know how it works, but that's what they did. They wanted her to absorb Sora's memories and then absorb me because it would give them control over his power. Xion figured it out first and refused to let that happen.
The memories that made her went back to Sora. That's why everyone forgot her until she came here. Anyway...because of what she is, sometimes people see her differently. To me, at the end, she looked like Sora. And when Terra first saw her, he said she looked like you, or me, even though she sounded the same. I don't know if he still sees her like that. But that must be what Vanitas saw, too.
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