Well, I got Freja Becker who is in Slytherin, she isn't Seventh year though. Otherwise I also got Nathaniel Greenfield, who is a Seventh year but a Gryffindor. Maybe any of them could get along with Mars?
I'm a bit late to the party, but yes, I imagine all Quidditch players know each other, whether they hate them or respect them. I would think the Ravenclaw and Gryffindor players would have some sort of mutual respect, while the Gryffindor and Slytherin players would strongly dislike each other...
Greetings! Call me Emi, that's what everyone else does. I'm a graphic design student from cold ol' Sweden and I love everything sci-fi and superhero-ish. My favorite spaceship is the Normandy and my favorite anti-hero is Deadpool.
Even though I'm more of an artist than a writer, I love rp'ing...