Sora, Riku, and Kairi are named after the three primary elements of nature. In Japanese, riku means 'land', kai means 'ocean', and sora means 'sky'. the name Kairi could originate from the Japanese word "hikari", which means light, because she is the only untainted main character. "Hikari" is the Japanese version of "Simple and Clean," though the lyrics have an entirely different meaning.
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