I would have to go with Lucy and Desi.
Rob And Laura Petrie
Spike and Buffy
and Jax and Tara
and Ragnar and Lagertha
Can't list just one, sorry. Lucy and Desi would be first though. Then Dick Van Dyke and Mary Tyler Moore, Bob Newhart and Suzanne Pleshette, Sam Heughan and Catriona Balfe.
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