Kingdom Hearts Something weird about Sora... *Spoiler*

Arg. Time for another stab at this monster!

When Sora lost his heart, his body was fading into darkness, but when Sora came back, his body was reconstructed from light/kingdom hearts/whatever power Kairi has. Roxas got his real body and spirit.

Namine... Well how about this... when her heart fell to darkness for that moment, Namine was constructed from darkness, and fragments of Kairi. Her body was given to Kairi, but she got a shadow body from darkness.

 

wikipedia has some kind of plausible info on the existance of namine and roxas...it doesnt go too much into detail, but it might help...go search...roxas...i think in the search bar