why does roxas look like ven...is this just a coincidence... or does it have deeper meaning...does ven slumber inside roxas.... did he choose sora as an apprentice....DISCUSS HERE

i think the fact that sora, roxas, and ven have the power of the keyblade im not sure though (well know one really knows though)

Well other people have the power of the keyblade and they dont look alike. I think that Ven was inside Sora all along and Roxas is the Ven part of Sora that came out when he was turned into a heartless. Now according to the time they gave us Sora was actually alive at the time Ven, Terra, and Aqua were fightig Xehanort. I think that Ven somehow put his being into the keyblade and then chose Sora. Once the nobody was made it was actually Ven's part that came out, which is why Roxas looks exactly like Ven.

I have a couple other theories but I may post them another time

i don't think keyblades have anything to do with it given that the king wields one.