Well seeing how she was made up of Sora's memories, she must've contained the memory of Sora being a keyblade master which, in return, made her a keyblade of memory.
In an old theory I read, it said that Namine is the creator of Xion. Supposedly while Namine was working to restore Sora's memories, there was a missing chain that had all of Sora's most valued memories in it. Diz(Now known as Ansem the Wise) had figured that without the missing chain, Sora couldn't return to his former self. In a way, Namine had created a "shell" made up of Sora's memories. The only way to return those memories to Sora, Xion had to be fixated. But Xemnas had got to her first not knowing what she truly was. He thought she was a nobody. He could see she had extraordinary power, so he made her the latest member of the organization. This indeed is just a theory though so...
I never said Riku was a nobody. And so far we were MEANT to believe Roxas is a nobody but I dont believe he is. Think about it. They say only those with a heart of pure light can use the keyblade,(And the only time heartless like beings can use it is if they began with a heart of pure light.)Nobodies don't have hearts so how can Roxas use one. As for Xion, shes said to be made up of Sora and Kairi's memories. That's why they say she is a new "special" form of a nobody. That's what I believe.
2 reasons why it MAY be possible Axel IS Riku's nobody.
1. Riku was in the door to darkness and we dont know what events went down in there but we do know the king was with him so if he was to turn into a heartless, the king could get him back therefore creating a nobody. Plus there have been numerous times he gave his heart up to darkness. Thats why his appearance changed in KH2.
2. Axel has the same eyes as Riku. Mere coincidence? Attitude resembles Riku's as well.
Plus Axel was given his name. Those are the only clues I could find.And I know this is a little off topic, but I just wanted to say Namine and Roxas are not nobodies.
The apprentice is like Riku in KH1. He must've gave himself up to the darkness but still had a heart. Thats why he has human appearance and not heartless appearance. I think he is the first heartless like being to come into existence seeing how it is 10 years back and only the unborn existed. Thats what I think anyways...
i believe Ven maybe an "unborn" of some sort. I mean they do say something about Roxas having a heart. Maybe Ven lost his memory when he was being erased and was put to sleep or something. And Ven and Sora's hearts are connected in some way and they "fuse". I dont know just a theory... And for some reason I think Xion is Sora's true nobody.
