Vivi and Lara
If Lu-Bu was free to hit Vivi before he cast a spell that makes the Lu-Bu go boom I might be more inclined to vote for him, but as it is I don't have enough respect for Lu-Bu's durability to tank a flare to the face without paying Vivi back (by the time he has changed to 'oh hey vivi needs to die' vivi probably has a second flare coming, and I respect flare.)
I just don't like the mix of guns/high powered magic here for lu-bu, despite him being a better fighter than either.
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Sir Chris
http://img.imgcake.com/Chris2pngas.png