River. Slytherin. Obviously. She's got all that ambition et al. There's also a case to be made for ravenclaw and gryffindor but given everything river does totes slytherin.
Anastasia. lol slytherin. She literally is all about taking care of herself first and wanting a better life where she doesn't starve. Also she will do stupid shit like join with jafar to get things she totes shouldn't have like the ability to break the laws of magic.
Alex. Alex rides the slytherin griffy border but I put her more on the slytherin side being all the stupid shit she does. Hell the show starts because she lies to get back into strands office to get her greedy little hands on them there black tapes.
paladinhufflepuff.