Here's my 15 nominations:
1.Charles Barkley/Michael Jordan
2.Albert Einstein/Adolf Hitler
3.Commander Keen/Dopefish
4.Meat Boy/Dr. Fetus
5.Phoenix Wright/Miles Edgeworth
6.Mario/Bowser
7.Sonic/Knuckles
8.Carl Johnson/Officer Tenpenny
9.Fox McCloud/Wolf O'Donnell
10.Solid Snake/Liquid Snake
11.Dante/Vergil
12.Kirby/King Dedede
13.GlaDOS/Wheatley
14.Little Mac/Mike Tyson
15.Disease/Madagascar
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Ninjas can't catch you,if you're on fire!