Here's something I either just thought up, or might have thought of it before. I DO NOT REMEMBER READING ANYTHING THAT MAY SOUND LIKE WHAT I WILL SAY.
Unbirths could be pure darkness. When people fought over the light (Kairi's grandma's story), the darkness was formed. That first bit of darkness took the shape of unbirhts. As the unbirths started being killed off by TAV, the free floating darkness started going into hearts to eventually consume the hearts and become heartless.
Either that or something concerning the soul.
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Thanks to Xadimurti for this awesome sig.
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