It would be impossible to mention all the ones I enjoyed but just to name a few
Shanks - Buggy - Always hilarious how Shanks treats Buggy like they're still old chums and Buggy then snaps at him.
Luffy - Vivi - "We hear your voice" enough said.
Franky - Senor Pink - Too hard boiled. If someone deserves to escape Impel Down it's Pink so he can share a drink with Franky and tell him about Russian and Gimlet
Brook - His Former Crew - "Quartet....Trio....Duet....Solo"
Koala - Sabo - Great couple
Oden - WB and Roger - GOATs
and many more but i'll leave it at that so I don't ruin your thread lol