This...should be interesting. Going for the prize sounds interesting, but so incredibly unlikely I'll just stick to whole numbers.

Knuckles the Echidna - 29%
Rikku - 23%
Vaan - 16%
Yoshi - 32%

Arthas Menethil - 8%
Diablo - 15%
KOS-MOS - 17%
Mega Man - 60%

Axel - 15%
Frog - 24%
Samus Aran - 54%
Sarah Kerrigan - 7%

Agent 47 - 13%
Kratos Aurion - 19%
Midna - 38%
Scorpion - 30%

Kefka - 40%
Marcus Fenix - 29%
Tom Nook - 9%
Zelos Wilder - 22%

Cloud Strife - 75%
Jill Valentine - 12%
Midgar Zolom - 5%
Revolver Ocelot - 8%

Auron - 49%
Chris Redfield - 15%
Pyramid Head - 8%
Shadow the Hedgehog - 28%

Bowser - 42%
Mewtwo - 17%
Ryu (Street Fighter) - 33%
Toad - 8%

These will probably be much altered once we see the contest in action.
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Mustache...and green...
http://www.rit.edu/~zmb0386/Brawl.jpg