+8 Pokemon Trainer Red vs. Blue
+7 Fox McCloud vs. Wolf O'Donnell
+6 Ryu vs. Ken
+5 Cecil vs. Golbez
+4 Ratchet vs. Dr. Nefarious
+3 Yuna vs. Seymour
+2 Raynor vs. Kerrigan
+1 Luigi vs. Waluigi
Never played StarCraft, but can't imagine there being a worse rivalry than Luigi/Waluigi.
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Not today