very hard question, or rather said, the question is wrong... you can pair it with most ninjas, what you are asking is what's a good meta for him, for that i'd say if he is full bt something like konan/asuma wb/EM.. you can get more info on the strategy thread

Depends on which Kakuzu you mean and which position you plan to use him for... but P1 EGF Kakuzu is somehow outdated right now... and for support, AC Kakuzu seems more versatile.