(SPOILER)Are sora and Roxas the same person?

Yes they are. Roxas was created at the moment Sora inserted Riku's keyblade in his heart, releasing his and Kairi's. Subsquently he became a temporarily a heartless. It is at this point Roxas was born and joined the Organization. Roxas is a Nobody like the other Order members, unlike them he was not a test subject of Ansem. Roxas is an anagram of Sora with the typical "X" found in many Organization member's names added to it.

Why is riku wearing a blindfold?

I think so....(Anyone knows?)

Who are the organization?

They are a group created from the No bodies formed from Ansem's test subject. (This is all I know)

Are the organization and the thirteenth order the same thing?

Again, I think so...(*sighs* I only read briefly upon the subject)

Which keyblades are in KH2?

Isn't there a thread about this?

Are Ansem and Diz the same person?

Yes. DiZ is the pseudonym of Ansem. After realizing the atrocities he had commited and that his kingdom was lost, he covered himself in bandages, taking on this name. DiZ is means "Darkness in Zero" refering to...(Again I fail to remember the rest)


I hope that helps a bit...Wikipedia has numerous articles you can find on the game. ^_^