Lucy Chambers, sixth year Ravenclaw. Lucy is sort of laid back, tends to offend people without meaning to and is basically very upfront with how she's feeling. She likes to troll people as well and tends to be this side of sarcastic. I think they would have hilarious, trolling conversations.
Julian (Jules) Dorny, stagnantly seventh year Slytherin and prefect. Jules is antisocial, slightly robotic in his encounters and very underwhelmed by most things. He would rather be reading/smoking/studying than interacting with people. Terence I think would actually be very overwhelming to him.