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Plot details for the Kingdom Hearts series follow.

Close. Heartless are actually darkness incarnate. But if you want to get technical, Heartless are actually the physical manifestation of darkness within people's hearts. Heartless seek out hearts, so that they can exploit the darkness within those hearts and create more heartless.  Timelinesplitter Chaos 22:20, November 16, 2012 (UTC)

Fine. This leads me to the BIG question. What was Sora from the Hollow Bastion events to the end of KHII?AkaAxl 22:44, November 16, 2012 (UTC

No one is really sure. Not whole, I can tell you that. *Spoiler* A Heartless with a heart and Ven's heart? - TidusTehSacrificer357 23:25, November 16, 2012 (UTC)
^^ Well, after Sora became a Heartless as we all may or may not know (Spoiler Alert for KH:II), Roxas and Namine were born, however, this was extremely unnatural and different considering Kairi involvement in the entire fiasco. Kairi's heart, as well as the hearts of the other Princesses of Heart dwelled within Sora until he turned himself into a Heartless. After Kairi found Sora's Heartless, Kairi protected Sora, however due to her strange powers as a Princess of Heart (which may, or may not have been activated unknowingly because of her feelings for him) Sora, for reasons unknown became a whole person again. To answer the second question and summarize though, Sora basically was his whole-self again, thanks to Kairi. (Spoiler Alert for Birth by Sleep) However, it probably did have something to do with Ven's heart.  Timelinesplitter Chaos 00:07, November 17, 2012 (UTC)