I have quite a lot, but here’s the main ones (not including any real person pairings that I have).
Steve Rogers/Bucky Barnes (Marvel)
Jack Sparrow/Hector Barbossa (Pirates of the Caribbean)
Charlie Pace/Claire Littleton (LOST)
Desmond Hume/Penelope Widmore (LOST)
Samwell Tarly/Gilly (Game of Thrones)
Will Turner/Elizabeth Swann (Pirates of the Caribbean)
Aragorn/Arwen (Lord of the Rings)
Sherlock Holmes/John Watson (Sherlock)
Dean Winchester/Castiel (Supernatural)
Clint Barton/Natasha Romanov (Marvel)
Hal/Lois (Malcolm in the Middle)
I think out of the above list, the one I love most is Charlie Pace/Claire Littleton from LOST. They’re both so adorable together and I just love them to bits. I think they may have also been one of my first OTPs along with Aragorn/Arwen and Will Turner/Elizabeth Swann.