kingdom hearts 3 takes place in the far away past when someone whas making all of the keyblades. Then when someone got one of the keyblades, he used it to destroy the rest except for kingdom key, king mickey's, and way to the dawn. That's one theory.
when sephi gets beaten in kh2, yo go talk to cloud then go to him again then they battle but after that where do they go? cause they suddenly go somewhere.
I would have to say it's riku because he uses dark powers and I like darkness. Sora is just so annoying saying all the things he says like "I promise" and says that to everyone in the game. He also looks like a clown.