Well, let's see. We already agreed on Anna being in Gryffindor, and I also agree with Kristoff being in Hufflepuff. I think Elsa would fit best in Ravenclaw, because she's intelligent and resourceful. Hans would make a good Slytherin, because he's clever and conniving. I think Rapunzel and Merida would join Anna in Gryffindor, because they are also outgoing and adventurous. But I'm kind of on the fence about Hiccup. In the original movie, I think he possesses more qualities of a Hufflepuff, but in the sequel, I think he possesses more qualities of a Gryffindor. I think he would fit well in either one, to be honest.