Well, I've always thought that Spike/Buffy and Veronica/Logan had a similar vibe: a sort of bitch versus jackass sort of thing going on, you know? (Jareth/Sarah might have a bit of this going on as well. But it's been ages since I watched that movie and mostly what I remember is DAVID BOWIE IN TIGHT PANTS! Oh, and muppets.)

And I haven't watched House in a while, nor have I ever really thought much about Mal/Simon as a pairing, but they might have a similar vibe, as well--like House/Wilson is a more extreme version of the cynical sort-of-rebel/conscientious doctor pairing?

But other than that, I'm not seeing any trends.