IX. Could you please gather some information about the main characters? The reason Sora becomes Anti Form, the reason Riku is able to be selected by a keyblade, Kairi's memories of Radiant Garden, Roxas and Namine's differences from other Nobodies, the absence of Sora and them, their parent's and friends, and what about school?
Concerning Sora's Anti Form, you could think that the reason is related to his changing into a heartless once before. In fact, beyond Sora's Nobody, it is natural to assume that Sora is influenced by the heartless. Riku's Dark Mode is similar. By using such a strong power too much, he may have ended up aproaching too close to darkness. There should be a hint about Riku being a choosen wielder hidden discreetly somewhere in the additions to the game, so certainly try and find it. As for Kairi's memories, there's nothing particularly special about them. If I personally recalled memories from before I was 5, I think I wouldn't remember many details about them. That is to say on a general level, there are things I would remember and things I would forget.
Because there is already a detailed explanation of Roxas and Namine being special Nobodies in this volume, please read the specific details there. I'll summarize it so its easy to understand. Essentially, when a strong hearted person has their heart stolen, they change into a heartless, and on rare occasions thier body changes into a Nobody. But in the case for these two, for Kairi's heart to be hidden within Sora, it took a special shape. Moreover, when Sora himself was changed into a heartless he was purified by Kairi. In order for Sora to be revived without following the essential course, the special way Roxas and Namine were born from these types, special Nobodies ended up being left behind. Still, I get the feeling from the story so far that Xemnas might also be a special Nobody.
