And I'm leaving for class in 15 so we seem to have a trend going here! I'm Lauren, I have three here.
This is Clara Avery's journal - 6th year Slytherin, not a very good purist but still supporting Voldemort because her friends and family are. Her brother is Rabastan's roommate, and I think she'd be polite.
Penelope Bell is a 5th year Hufflepuff, totally sweet and naive, so she'd think Rabastan was perfectly nice and probably very dark and mysterious, all that sort of thing. She'd be friendly.
Professor Babbling is a Ravenclaw grad who likes the students who are smart and work at her class and doesn't like the bigots and the lazy ones. If he doesn't take Runes, he will fly basically under her radar.