Fiona and Shrek
Hal and Lois Wilkerson.
Turk and JD from Scrubs
Legolas and Gimli.
People have already brought up my favorite (Leslie and Ben from P&R), so I’ll mention my second favorite: Elizabeth and Peter Burke from White Collar.
One of the funniest scenes from that show is when Peter, working undercover, has to take compromising pictures of himself with a woman other than his wife to give to the bad guys as “leverage”. Elizabeth is on hand, coaching him on how to make the photos more scandalous. That kind of security in a relationship is great.