Well looks like Chris is still against me on this, ha, but all righty I'll go for it.
Sci-fi versus magic, always wacky. I think people tend to give magic the edge, but then again these magic characters seem just as mortal, even Orochi can be defeated by a bunch of punches in his games.
Duke outclasses Bill Rizer, maybe trick him with the holoduke and blow him away. Armitage is one bad dude, I think he could take take Selvaria. Orochi really has nothing special in the defense catagory, Samus's armor could protect her from some of his attacks while she proceeds to blast his brains all over the wall.
Fou-Lu and Isa are the characters I know the least of, but after a quick look online I'll say they're fairly evenly matched, they blow eachother away. Terry is not to be underestimated, and I think he could do some major damage against Nero with some power geysers, but a few guns aimed at Terry at the same time and its academic. I bet on team Duke.
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One Piece: Pirates with style!
-= Metal Gear Solid: Tactical Espionage Action =-