Mushroom Division
Mario over Joanna Dark with 81.19%
Carl Johnson over Ness with 55.45%
Zero over Ryu Hayabusa with 66.34%
Lloyd Irving over Albert Wesker with 63.37%

Zebes Division
Samus over Yuri with 89.11%
Frog over Riku with 60.40%
Ganondorf over Yuna with 68.32%
Auron over Big Boss with 64.36%

Gear Division
Solid Snake over Manny Calavera with 91.09%
Zelda over Vivi with with 56.44%
Alucard over over Kratos (God of War) with 61.39%
Sora over Agent 47 with 80.20%

Dream Division
Kirby over Cecil with 64.36%
Tidus over King of all Cosmos 82.18%
Bowser over Chun Li with 72.28%
Ryu (Street Fighter) over Rikku with 60.40%

and yes, I intentionally made the parts before and after the decimal point add up to 100 just for fun.

GJ
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My top upset: Kefka>Vercetti