Adding on to what I already have...
Mega Man X vs. Zero with 74.17%
Bartz Klauser vs. Gilgamesh with 56.77%
Donkey Kong vs. King K. Rool with 51.55%
Sub-Zero vs. Scorpion 55.30%
Pokemon Trainer Red vs. Pokemon Trainer Blue 84.66%
Luigi vs. Waluigi 64.71%
Ryu vs. Ken 69.11%
Yuna vs. Seymour Guado 51.15%
Samus Aran vs. Ridley 69.35%
Terra Branford vs. Kefka Palazzo 60.76%
Chris Redfield vs. Albert Wesker 57.52%
Big Boss vs. The Boss 54.10%
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[3FC]Jov Is SoReal
CB8 379/448 (1109th place); GotD 295/448 (494th place); PERFECT oracle of FFX/FFIX battle in GotD; 16th in GotD Save Yourself