Anna and Kristoff, but really only by default. Incest shipping is extremely squicky to me, so that's out. Hans is evil, so unless it's some kind of AU where that didn't happen, I can't ship him with anybody. Elsa and Kristoff barely interact throughout the film. So Anna and Kristoff are hardly one of my favorite Disney couples ever, but of these options they're the one I like best.
I am Team Hansanna because I'm contrarian. I think Hans was acting the way heroes do in fairytales: the witch curses the kingdom so you slay her and get the girl! I don't think they'd have worked out, but their connection initially was sweet.
I identify more with Elsa, so I'm more Interested in the possible pairs for her. Anna and Kristoff are utterly adorable together, so I like seeing them too, but I tend to read stories that ship Elsa with either a redemed Hans or Jack Frost. I have not decided which I like more yet.
Elsa and Hans are so charismatic. I think Hans would be less manichean once we knew he was the "bad guy". I think he can really rule a Kingdom/ whatever dom XD. Anna and Kristoff to my point of view are too much "good Disney characters" even if , well, it's a Disney...
Hans and someone who isn't as utterly passive in relationships as Anna was for the rest of the film! I'd happily friendship pre-plot-twist Hans with Anna though. They had a great connection before he started twirling his metaphorical moustache of evil.
Post-plot-twist Hans with Disney's Ursula maybe. I don't know why it got into my head, but they both used deception to try to marry into greatness. They'd make a devious duo partnered up in any way.
...Possibly I'd just like more of any sort of Hans paired up with anyone in any way.