Leanne Clearwater (daydreaming) is a 5th year Ravenclaw. She's introspective and off in her own world half of the time, shy and quiet, and aspires to become a fashion designer. She probably finds Roger somewhat intimidating, but might be used to him, idk.
Audrey (audrey_elise) Bulstrode is a 6th year Slytherin and prefect. Audrey is ladylike, a good student, and tries her best to be friendly and outgoing, as she knows people skills and charisma are important in politics, which she plans on going into after Hogwarts. Audrey could have hooked up with him in the past? You know, for cliche PB reasons. Also because knowledge of that might annoy her boyfriend, Adrian Pucey, who has been a Quidditch rival of Roger's (well, once we get Adrian in game, anyhow).
And last but not least is Alexandra Volakis (this journal), 7th year Durmstrang student. Alexandra is from Greece. She wants to become a healer, which stems from the fact that she likes helping people. She's very people-oriented, a good listener, and an avid reader. She would be friendly, like she is to almost everyone.