Lucy Chambers, sixth year Ravenclaw. Lucy can be a little abrasive without meaning to be, she likes Quidditch more than people and is a little too honest. Its hard to tell if she likes you or not, but she generally does, you just need to ignore the rude. She likes that Orsino has his own thing and will be her brand of friendly.
Jules Dorny, stagnantly seventh year Slytherin and prefect. Jules is Orsino's roommate, is very closed off and generally hates everything. He likes to read, he likes to smoke, he doesn't like to socialise. He's permanently underwhelmed by everyone. He'll be as friendly as he can be to Orsino.