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Also be aware that some of the castmate entries contain SPOILERS for the Kingdom Hearts series. You have been warned!
Sora's best friend. They have known each other since they were little kids. Riku's a year older than Sora, and growing up he would excel in just about everything while Sora trailed behind. While this molded Sora to be constantly competitive, he admits Riku being better is a comfort to him and admires Riku.
Their friendship has had it's share of problems, differences and one or two near fights to the death (it happens!) - but they have overcome those and have a strong bond to one another. It's no understatement to say they would go to the ends of the Earth for each other. Even though Riku has been here a full year, that hasn't changed to Sora in the slightest.