Hm.. Sasuke and Darui. Black lightning style would compliment the sharingan so much, chidori would be usable against stronger opponents, black lightning kirin cast from inside amaterasu covered susanoo would be quite strong, etc
also, Hidan and Muu.
Sai+ Konan.. paper clones that draw on themselves for swarms of ink creatures..
Deidara+ shikamaru.. create explosions to blow shit up, plus shikimaru uses the bomb flash to extend his shadow reach etc