There's something comfy with Love Live/Harry Potter crossover pictures. I saw a good one with the Aqours girls on Pixiv a few days ago, it really has potential. And while I mostly agreed with the choices for that one, here, I beg to differ.
Setsuna would totally be a Gryffindor, she likes nekketsu and hero stuff; plus, red is her color, so it'd be a real missed opportunity! Also, Kanata would probably work better as a Hufflepuff, because of her being a "my pace" kind of girl and her borderline-narcoleptic tendencies. As for Rina, I kinda like the artist's idea.
I wonder what would be the best houses for the other girls. I could probably see Emma as a Hufflepuff, Ai as a Gryffindor, Shizuku as a Ravenclaw and Kasumi, Shioriko and Karin as Slytherins.