Lexi - Hermione would like to point out that a good bedside manner is integral to the job of Healer. If she can't try to improve, she's a horrible healer, no matter how good her diagnoses may be. So I don't imagine they'll be great with each other. Ted will be nice to her anyway.
Marcus - I mean. Quidditch, so James will try not to be too picky about the whole House situation? Ted probably won't be unpleasant. Zach wants to be his friend.
Louis - Hermione will be THRILLED to meet him!
Penelope - Hermione knows her as well. I don't see why they couldn't get on? Unless they really don't get on, which is also possible. Ted will be nice to her... James might pick on her a bit, I'm not sure yet. Zach will definitely pick on her.
Harry - I see what you meant... James is over the moon, Hermione is relieved he's here (even if he is so much younger than her), Ted doesn't know him but will be happy to get to and Zach hates almost everything about him, but most of all his stupidity.