Tamsin Applebee, sixth year Hufflepuff and resident Hogwarts hipster. Tamsin is a little pretentious, doesn't speak much and tends to be in her own world. She makes her own clothes, is sort of a crafty kind of person, is vegan, basically a hipster before there were hipsters. She's also a very quietly out lesbian and doesn't really care who knows or not. She doesn't understand blokes like Roger, but wouldn't go out of her way to be rude.
Lucy Chambers, bemoaning sixth year Ravenclaw and fellow Quidditch player with Roger. Lucy is sort of no nonsense, sarcastic and tends to basically speak her mind at all times, even if hurts someone's feelings. This loss of Quidditch is killing her and she wishes these tasks were just done and things could go back to normal. She'll call Roger out on his crap, but with love. I can see them being friendly.
Jules Dorny, stagnantly seventh year Slytherin and prefect. Jules is perpetually underwhelmed, he doesn't like you, he doesn't care if you like him if everyone just leaves him alone. He comes across as rude, which he is, he has a robotic air to him and basically he's the worst person ever. He won't talk to Roger and that's probably a good thing.
Sophie Ledoux, unconversant seventh year Beauxbaton visiting student. Sophie is really friendly, really laid back and basically likes everyone. She looks at this as one big vacation and likes meeting all these new people and is basically a ball of sunshine. She'll be friendly to Roger.
Olivia Jørgensen, ohlivia seventh year Durmstrang student. Olivia trolls everyone, it's incredibly difficult to figure out if she's being serious or not, she pretty much making fun of you all the time. She has a really carefree way of looking at things and just feels stress makes your life so much blander. She will have trolled Roger at some point.