0. Zetsu and Obito (the ones behind it all)
1. Pain and Konan (epic teamwork, knew each other, fleshed out friendship and backstory)
2. Sasori and Deidara (arguably the most powerful team behind Pain and Konan)
3. Itachi and Kisame (Good team synergy and mutual respect)
4. Hidan and Kakuzu (couldn't die, hilarious interactions)