In the rotbtfd fandom I see loads of disagreements about the hogwarts!au, and especially about the houses! like:
If Hiccup is a ravenclaw or hufflepuff.
If Anna is a Hufflepuff or Gryffindor.
If Elsa is a slytherin or ravenclaw.
If Jack is a gryffindor or slytherin.
or if Rapunzel is a Ravenclaw or hufflepuff.
The only thing this fandom seems to agree on is that Merida is a gryffindor.