Let's see, Lu Bu can tank elemental attacks and poison. He can tank arrows by the dozens. Honestly though, I think an SMG among otehr bullet firing weapons would rock his face. Lara Croft alone could handle this.
Lu Bu needs a partner, two against one is completely unfair. If it were Vivi versus Lu Bu and Lara...or even Lara verse all, maybe it would be closer. This two against one thing needs to be put down.
Anyways as much as I love Lu Bu and Dynasty Warriors I can't say with confidence he would win this match under any circumstances.
Vivi and Lara would indeed provide Lu Bu with a decent challenge.
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All you need is love.