Add Jecht and Sin to that list, each of which are are one appearance.
I should also note I added Dark Link and Navi because they have two or more appearances yet never made it into a contest. I should probably count the Koopa Kids under this exception, too.
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First with SSBB > SMG in 2009, then with the GotD-contest: BT owned me once again.
http://img812.imageshack.us/img812/3492/eponaharr.jpg