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. as for sora getting two, i guess it just the power of fusion that allows this. and as for rikku and kairi, riku is a keybearer as well so it was just a matter of time till he discovered his, while how he got one for kairi i'm not sure.
Roxas was "chosen" to weild the Keyblade because he is Sora's Nobody. But I do have a question:
Yen Sid tells you that Mickey found the Keyblade of the dark realm. Which realms did Sora's, Kairi's, and Riku's come from?
Kairi gets a keyblade because she has a pure heart, devoid of darkness. Riku gets a Keyblade because he was the original Keybearer before he gave in to darkness, and Riku's Keyblade was born from his Soul Eater. Roxas has two keyblades because he's part of Sora, and because Tetsuya Nomura said so.