Israel and I are planning on doing a polyamorous Frozen RP, and we need one more person. The ship is Anna x Hans x Kristoff, with Israel RPing Hans. I think I'd be better at Anna than Kristoff (neither of us are used to playing canon characters), but you can choose whichever you prefer.
I know Hans is the "bad guy" in the movie, but I have a plot to justify this choice...
All along, the trolls were evil. They kidnapped Kristoff (as trolls are actually known to do, as in, kidnapping kids and making the kid forget their family, and vice versa). After all, why would young Kristoff be off alone harvesting ice with his own tools? It doesn't make sense, unless one of the other ice harvesters are his family. The trolls also mind controlled Hans, so that they could get him out of the way, and put Anna and Kristoff together.
Why would they want that? Well, you see, the book Elsa and Anna's father got information on the trolls from has a picture of a troll that looks, well, sinister. The kingdom likely hated these creatures who had mind magic and stole their kids, so they killed them, and chased them into solitude. The trolls resent this, and so they want to control the royal family, so that they can roam like they once did. It's harder to get the head of the country close enough to mind control, so instead, they set this up.
Once Hans gets to his country, he's freed from the mind control, and under the crushing guilt of trying to kill two people, one of which he honestly cared about. He doesn't know why he did it, he feels as if someone else was moving his body as he watched on. It was horrible, but now he can never make it up. The king (who I like to imagine is his oldest brother, but it doesn't really matter, I suppose, could even be a queen) is upset, of course, and never really liked Hans anyway, but, to keep the family reputation, he hides the event from the public, but forces Hans to do work around the castle.
Later on, Elsa is invited to the Southern Isles, with the king trying to repair relations between their nations, pleading that Hans' actions don't speak for the entire country. Elsa reluctantly agrees, but she doesn't want to leave her kingdom. She still has a lot of work to do, after all, so she asks Anna and Kristoff to go. They agree, and soon are off with the promise that they won't meet Hans. However, they do meet Hans, and after not wanting to listen to him and simply punch him, they decide to listen to what he has to say. He seems completely different now.
They figure out the trolls are evil, and the three go to try to right things. Along the way, they find they've all fallen in love with each other.
Not necessary, but possible: Hans has fire and/or Anna is unusually strong (though that's pretty much canon- she flung a bust, hit a full grown wolf that was lunging at her a good distance away, and punched Hans to the point of sending him flying off, the girl's strong).