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I always used to think they were seperate beings. I mean, don't Sora's eyes change colour when Yoru takes over his body?

They do, but I don't think anyone else can see that. Because if you notice, he kinda shifts into a nother demntion type thing. O_o Because there's green and black floaty stuff around him! ^-^

it reminds me of yugioh...
like yugi and yami...
like their voices change and so does their apperence
(well their eyes in sukisyos case)
after a few episodes, well the one where shinichirou
kidnaps sunao and he turns into ran,
yoru uses magic powers or something,
witch means there is a possibility they are seperate beings...
but if that magic hadn't been shown,
i'd label it as a case of skitzafrania(spelled right?)
or if you wanna get spiritual, maybe possesion?
or just from a traumatic experience...
who knows^_^