So do millions of othersOutside he has a nobody,
As we know of, so do at least 8 if not millions others.a keyblade,
Like everyone else in the game.affinity for all kinds of magic,
Common trait of a main characterrapid growth of skill in the games,
Which is a part of his personality.and his amazing charisma?
So does any of this make him special? Right now he has done nothing great or interesting. Sure he saved the worlds, learned cool magic and stuff, but so have hundreds of others.
Sora has yet to do anything that difines himself or make him different from anyone else. He is nothing special. Just an island boy who is the replacement hero.
And see? Your comparing Riku and Terra again. Not Riku and Ven.No.... from what we've seen of ven he is the 'twilight' member of the group. Although terra gives into darkness IN the 2nd secret ending, it is shown that ven shares riku's place in terms of crossroad. If anything, terra is the polar opposite of riku, as he gives into darkness after championing the light, whereas riku gave into the darkness and is later redeemed to form his twilight existence.
Srsly, the only thing the two share in common is that keyblade. Nothing else that we have seen of Ven relates to Riku besides that keyblade.
You can come up with different explinations, but it will all revovle around that blade. While on the other hand, Sora and Ven hold alot more of a connection.