Tifa/Big Daddy was right after Sephiroth/Missingno, though I don't think there was much damage so Freeman would just be at around Big Daddy's strength.
Alucard looked pretty good last year, he'll should be the favourite over either Freeman/PW.
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BOP Results: http://www.freewebs.com/charmander6000/Rivalry%20BOP.xls
BOP Topic: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60566352