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If they HAVE to be rivals- Raziel (Legacy of Kain) and Alucard (Catslevania) (the rivalry match up would be just too beautiful)
If they DON'T have to be- The Dragonborn and John Marston. (Even have a move set for the Dragonborn that I'm sure a few of you have seen in the topic I bumped every day until a fellow pointed out why no one was posting ;_;)