Are we forgetting that there were people once saying that the mix of Square and DISNEY wouldn't work, and look at it now. Why wouldn't it fit in should be the better question. I personally would find the crossover welcome. The Noise reminded me a bit of the Heartless and Nobodies in a way. The chances of the crossover happening are slim, so I'm not hyping myself over it, considering that there haven't been any other characters from other Square games except for FF. But my opinion being that I think the mix would be interesting, just because The World Ends With You was a truly awesome game and I would love to see it in an other format, be it another game or a cameo/world/whatever in KH.