From the little blurb of Cameron, they are soul-mates lol. Though she is like WHAT no Divination not important. They can debate this I am sure. I think there is probably a good chance they are friends. And she is totally supportive of him going out for quidditch.
Nora and Ronnie will not get along because she is everything she doesn't like. So Yes Mortal Enemies. Ronnie is going god my mortal enemy is 14.
Keziah and Ronnie it think will be random interaction, which I suppose fully.
Charlotte and Ronnie probably don't get along too well, as that cheerfulness will drive her batty. But they have definitely shared classes so she knows of her. I don't think she hates her just finds her annoying?