Ok hear me out:
Peter (hufflepuff): he is hardworking and wants social harmony
Lucy (gryffindor): she is queen lucy the VALIANT (synonym of brave - she's got a pretty set moral compass and she's always rushing into things)
Edmund (ravenclaw): ok so maybe you think he's a little emo but really, he's the 'just' one, because of his fair judgement and council.
Susan (slytherin): ok I love her, but she's the one who's lowkey cynical, encouraging them to leave. she's logical, but to the point of being crazy stubborn. it isn't a bad thing, but more a slytherin thing than a ravenclaw one.