fictional couples meme-thingy

Comment with a fandom, or two, or five; books, movies, tv shows. I'll tell you my favorite character, my favorite couple and what I like about the pairing, and... whatever else I'm supposed to say about them. Alas, I am too late/lazy to look up anyone's recent-ish version of this meme. You can tell me what else I should say, if you wish.

It's for SCIENCE, by the way. (Heh.) I thought I had figured out the key to my own (fictional) pairing preferences, but now I'm not so sure. Possibly I was too sick to be making sense when I figured out this supposed key.
Although the common cold really shouldn't cause that much loss of sense. *snickers* Possibly my favorite pairings have NO common ground?