Cool! An Eragon/Kingdom Hearts crossover. Why didn't I think of that? Great idea.
I like how you're writing Riku, but Sora seems kinda OOC at times. Would he even stop to pack before leaving the Islands? He seems like the type to rush into things. He also seems to have more endurance than plopping down after a short hike, but maybe that's just me...
Looks like Eragon's got a new blade. About time. Murtagh shouldn't have stolen Zar'roc from its rightful master. :D
I noticed a few typos and redundant sentences, but hey, no one's perfect.
Keep it up! I want to see how this story plays out.