[@Gisk] Hm, maybe the heartless thing works if say, a keyblade noticed that there was a heartless fighting other haertless, and decided to help it, giving it sentience and all that fun stuff. After all, its the keyblade that chooses the person and whatnot.

Plus it would REALLY match well with the title. Whats more unnatural than a heartless with a keyblade? xD