That would scare the crap out of me. I don't see why Nintendo would be helping revive their main opponent's mascot. That would probably lead to much better Sonic games in the future, but I don't see Sega selling Sonic. Also, I think that MKwii since it is mario based will be only mario characters forever...I hope at least.

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{Spur of the moment Toad Mario Kart poem below! lol it is bad!}