Adam Crawford/Kurt Hummel from Glee.
I love those two individually as characters and as a couple with the intensity of a thousand suns. It's just such a happy ship, too honestly. It lifts my spirits when all else fails.
(And, for the record, klaine is my NOTP now. I feel like that needs to be said because I used to be such an obnoxious klainer, and it's honestly such a terrible ship.
)
I think I've rambled about them before, but I will do it again. Fox Mulder/Dana Scully from The X-Files.
Take the intensity I mentioned having for Kadam above and multiply it by like infinity and that's my love for MSR (Mulder Scully romance...The X-Files fandom predates portmanteau couple naming for ships) and for Mulder and Scully as individuals as well. MSR is the
ultimate OTP.
Oh, and I've always been a huge fan of Janto (Jack Harkness/Ianto Jones from Torchwood), and I don't think I've ever even mentioned it in this thread, which is odd. Yeah, it may not be as huge for me now as the two OTPs above, but it's an awesome ship.