Star Wars Battle Royale
Fisrt off, how could the whole Fett vs. IG-88 battle even be a question? If you've read Tales of the Bounty Hunters, you see how easily Fett defeats IG's A-D. Granted, one of them became super powerful by infiltrating the Death Star, but it was destroyed in the end, and Fett wasn't.
As for the Obi-wan vs. Corran and the Exar Kun vs. Bane matches, they're pretty evenly matched. I would add a draw option to some of them.
Boba Fett wins everything as a matter of course. His whole life is about fighting, and he has a flamethrower.
And for Ackbar versus Boss Nass, is this underwater?

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