My list
Alf and Ailsa-Back bone of the show for first 12 years and no doubt if Judy Nunn hadn’t decided to leave, they would continue on as backbone of show.
Neville and Floss- I know this might seemed an odd choice as they left very early on and they were rather one dimensional, but you still couldn’t have one without the other and the actors did pair well with each other.
Tom and Pippa-First Parents on show that bought us Summer Bay.
Michael and Pippa-Despite preferring Tom and Pippa I still do feel that Pippa and Michael really did bring strong realism being together as they were together in real life .
Matt and Evie-Despite getting together just before they left after being friends for years but build up to their characters maturing and getting together was great development and good ending for characters