http://farm3.static.flickr.com/2298/...f7d54deb_o.jpg
cool pic of complete roster
same site but it shows you how to unlock Mario Kart Wii, how to unlock everything | WiiNintendo
Nintendo - Games - Mario Kart Wii
this confirms the characters by nintendo + I completed the game myself so I can confirm, ... everything.:D
(although I am not happy rob didnt make the cut.)

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Okay, I admit it I'M OBSESSED WITH BOO! (and mario kart wii)