(1) Samus vs. Ridley
(8) The Kid vs. The Guy
The guy? The guy? SAMUS FLIPPIN ARAN IS "THE GUY."
(4) Terra vs. Kefka
(5) Vyse vs. Galcian
Kinda hated Kefka after playing FFVI, but I loved Terra. That's more than enough to take out unfamiliars.
(3) Chris Redfield vs. Wesker
(6) Dan vs. Sagat
More RE goodness, even if it is bogged down by Chris.
(2) Tidus vs. Jecht
(7) Big Boss vs. The Boss
Boss/Boss is one of the best and most powerful rivalries I've seen in a game. They got dis.
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Yoblazer: http://i32.tinypic.com/zlf1w7.gif
Watch and you'll see... someday I'll be... part of your world!