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From what we've seen of BBS, the Keyblade master's are way more based on Jedi than Harry Potter or Yu-gi-oh.
Riku is a Light-realm Keyblader, just as Sora is. He's not a "twilight realm" or anything. There are also Keyblades for any strong heart, which is why Riku and Kairi have them. You should probably read the Director's Secret Report XIII.
Something important to note is that even though Roxas can change his Keyblade's shape and powers with Gears, the Keychain is always the same, except for those Keyblade forms he inherited from Sora (Kingdom Key, Oathkeeper, Oblivion, Two Become One). So, Keyblade form-changing and Keychains are NOT directly related - and the whole leadup to KH2, especially the comments about Roxas (see Oathkeeper/Oblivion) indicate in fact that the Keychain's are symbols of a memory, and that MEMORY is what changes the Keyblade's form - so a true master of the Keyblade could manipulate his Keyblade as he so liked - as seen with the Lingering Sentiment and the Dark Keyblade. The Keychain seems to in fact be a focus for the memory, much like the horse was for Ren Tao in Shaman King.
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