Samus vs. Ridley
Terra vs. Kefka
Never got much of a rivalry vibe from Terra/Kefka. It's even weaker than the one between Samus/Ridley, believe it or not. Also Samus too awesome.
Chris Redfield vs. Wesker
Big Boss vs. The Boss
RE finally tastes defeat. Tastes like Jill Sandwich.
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Watch and you'll see... someday I'll be... part of your world!