Hello!

I'm not sure how well Sara would take to him; she usually gets annoyed if someone is snide towards her and can be snide in return; this is assuming Barty "tests" her, though. Most likely, she would be put off by his arrogance and self confidence, which is funny because she is pretty cocky at times too. But she'd be impressed that he'd play pranks, and I daresay she might've joined in with him once or twice (if you like). So I guess what I'm trying to say is that she'd probably not like him too much, but wouldn't mind hanging out and causing some mischief with him.

As for Daria and Narcissa, it seems unlikely that she would come into a lot of contact with either of them. I'm not sure how an exchange between Sara and Daria or Narcissa would go, either. But Narcissa doesn't seem like the kind of person Sara would really like right off the bat - it would take a little while if she were to like her at all. And Daria, well, I think Sara would think of as - like you said - tense.

If you have any ideas, just lemme know by PM or AIM (TheAgonyofBlank).