Ok, heres what I think ( I've said this before long ago )
Sora/Ven = sky
Riku/Terra = earth
Kairi/Aqua = water(or sea. whatever. )
Sky = Heavens, above, light
Earth = Human, middle, twilight
Water = Devil, below, darkness
Now, just because I say "devil", don't take it to seriously. XD Water/darkness can also be seen as Motherly, calm, peaceful, sleep, night, moon while light can be seen as the opposite.
Now heres a lil poem/story thing my friend and I came up with a while back:
Land and Sea both look up to the Sky.
The Land reaches up with it's mountains and challenges the sky.
But It cannot reach.
The Sea reaches up to the sky with it's waves, trying to grasp hold of it.
But it cannot reach.
The land and sea constantly challenge each other, seeing who can claim the sky first.
But neither succeed.
They can only look up and watch, envy, and admire the sky's beauty.
Though the land and sea have their differences, they share the same sky.
One sky. One destiny.
In other words, I still think that because of what they're names represent, SORA IS GONNA TURN INTO GOD...or something...
Any of you guys seen Diebuster?
Sora = Nono, Gunbuster = Kingdom Hearts
Yea...something like that...grrooooovin magic.
But I can see Sora becoming a heavenly like being in the last game or something, and having to go away forever. That ending would be awesome. D: