I really don't think of myself as an OTPer although most of my fanfic is about one pairing. I really like the potential for a Scott/Logan relationship, so I've mined that a lot. But I'm mostly interested in both of them or either of them, paired with people or not. When I hear "OTP" I think of people who don't want to read about their guys paired with anyone else.

I love reading Scott/Jean. I always say if my Scott weren't gay they'd still be together and for versions of Scott who isn't, I think they're a really interesting couple. I also like reading him paired with other people - men and women - if it's done believably and written well. I have a lot of trouble with Scott/Student stories because I just don't see how that would work with his by-the-books character, at least not without a lot of guilt and soul-searching (and the ones I've read tend to be romantic fluff) but other than that I'll take most any pairing with him. Well maybe not Scott/Charles.

I also like to read Logan paired with a variety of characters, preferably someone with some contrast to him.

In Star Wars fandom I am most taken with QuiGon/Obiwan, just because of what you see in TPM, but again I don't feel anything negative about other pairings for either of them and enjoy reading other couples stories when done well. And I can't even begin to understand the vehemence of the pairing wars in HP fandom...

I don't even believe in OTP in real life, much less in fanfic.