You can see the realm of darkness at the end of Kingdom Hearts II. Sora and Riku arrive at the dark side of the Destiny Islands. Then they get back to their side, the light side after they have found Kairi's letter from the light side.
It is true Xemnas wanted to get even more and more powerful. But you should not use other characters as arguments when you explain something in Kingdom Hearts. Just because the other characters have fused with their other side it doesn't mean Xemnas just needed to fuse with "Ansem". Also there would still be a missing part: The body. Sora and Kairi could fuse with Roxas and Naminé because they are not just Heartless and Nobodies. Sora got a new body because of Kairi and Kairi still had her body because she was connected to Sora while she has lost her heart so her heart was not controlled by her own darkness to form a heartless of it. But Xemnas and Ansem are a Nobody and a Heartless. Of course Ansem has a new body because of Riku but he has not his own body - or should I say...no...I do not want to spoiler Birth by Sleep. And it still does not matter. Ansem (while controlling Riku, not Riku who just looks like him but has his own will) and Xemnas have never met. So they never had the chance to fuse even if it would work.
Also I do not believe Roxas really has emotions just because he is "special". You can see emotions of almost everyone in the Organization XIII because Nobodies just act like they would have feelings and because it is difficult to make a whole story with boring, emotionless characters.
EDIT@Mercen & Pupu: Whatever you think, just think it. I know all these reports and informations about Kingdom Hearts and I do not need to be reminded. And what you say does not make sense like many things in Kingdom Hearts. I am always using the most logical explanation I can get from the information of Kingdom Hearts. When you only use the informations in separated form you will see there are many plot holes so they do not make sense.




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