Unfortunately it is a long time ago that I played KH1, so I don't remember the Legend of the Keyblade. But I remember that the keybearer can bring darkness as well as light. Well, I personally dislike this seperation between darkness and light, because this is just not the way the world is. Of course everything has positive aspects and negative aspects in KH terms: “Every heart has a dark and a light side”, but I don't know if it is possible to seperate them. I think this is one of the more mature topics Nomura wants to point out. All of you assume that Sora is Light, I don't think he's light, his heart possesses darkness as well. If you would separate both parts the heart will vanish. In Hollywood movies you often have this separation between the good guys and the bad guys and Disney is quite famous for doing that. But we watch those movies from a very one sided perspective, we only get told what we are supposed to know (much like the news in the USA) and do not get to know the motives of the bad guys. It is quite simple to think this way, but is the bad guy always evil? Is it not perhaps possible that they do the things they do because they love someone, for example Ansem: If you start reading his reports you realize that he wants to understand the darkness of the heart in order to fight darkness “before the world is lost to those taken by the Darkness”. So he started all the research not to become the ruler of the universe but to save his world and its people, much like Mickey does. In his report Nr 8 he says “The machine's test run successfully created a Heartless. This may be a step toward creating a heart from nothing.” So Ansem was very aware that the Heartless are a part of peoples heart, but not all of it. The same is for the light side, it is just a part of heart but not a complete heart, thus it may not be called a heart. Only both parts together create a heart similar to the saying: “The whole is more than the sum of its components”. So why did Ansem want to create a heart, perhaps someone he loved has lost it, who knows. But in Japanese stories you often get to know the motives of the bad guys and you come to a point where you can understand them and maybe even think the way they do. Everytime you help someone you hurt someone else, that’s the way of the world, those two aspects cannot be separated and it’s the same with the heart. But as we all know there is not a perfect balance in our hearts, some tend to the dark side and some to the light side and depending on that tendency is the fate of the keyblade, if it is used for good or for bad. The problem arises in Sora, does he tend to be light or dark. Well, from our temporary point of view it seems that Sora is more light, but that can easily change during the course of his adventures and I’m not quite sure about it actually. The same is for the Organisation and especially for Axel, we do not know if they are good or bad, because we do not know their motives yet. Actually I believe there is no good and bad, it’s all the same. If you do good you do bad the same time and if you do bad you actually do good to someone the same time, that’s reality, that’s what Twilight stands for. Maybe the Organisation is even a force to keep the world this way. Just remember if one side gets to strong and separates itself from the other one the whole thing will vanish. It might be the task of the Organisation to prevent that from happening, that’s why they seem to be evil at one time (light is too strong) or good at another time (evil is too strong). Riku became darkish when Sora became lightish, their lives are connected, perhaps in the end Sora will only be able to save Riku from darkness when he puts down his weapon and quits fighting the darkness, abandoning the light. Therefore there will be no more reason for darkness to exist in Riku to counteract Sora and everything will be okay. Maybe this is one of the things Sora will have to learn during his adventure (besides that Sora is only the consciousness of BHK (twilight=reality) 
). I think this will be a very cool ending.
). I think this will be a very cool ending.
