For some reason, I think that, yes, Riku will like Xion, but not as much as Sora and Kairi, Roxas and Namine do. But like what Sho said, I think he will have enough hatred inside of him because something might've happened to Xion.
Also, I agree with Tonks upon saying that Sora and Kairi, Roxas and Namine aren't actually dating, but it is overly obvious that this is the way they feel for one another.
ObsessedWithSora is also correct that Square wouldn't allow romance between that two main couples, but they did do that in Final Fantasy with Cloud dating Yuffie, Aerith, etc. But this is an E-E10 game, so, yeah, Square wouldn't want that to overcome the actual storyline. But it's already happened...
For me, it depends on when you're fighting them. In Chain of Memories? Yes, Axel is the better fighter. In Kingdom Hearts II? I also believe Axel is better. But like I said, it depends on your skill level, and which games you're talking about (and yes, I do realize that this was posted in the Kingdom Hearts II section and not Chain of Memories, but still).
Don't know how to post pictures, but I was a girl Joker (my own version).
For some reason, it ended up as teenage boys seeing me and saying, "That was one sexy Joker!", "Dude, did you see that Joker chick?!", and last, "'Dude, that Joker was a chick!' 'That fine by me!!!'" It was funnier in real life, though, I really didn't expect it.