Okay!

So my newbie Chuck here will probably like Kirsten, but I don't know if they'd know each other. With Chuck being a Senior and all. Chuck likes to attend all the Quodpot and Quiddich games, though, so I imagine she's at least seen her play. And they're in the same house, so run-ins are always possible.

Lisette loves hats, too. Especially the funky kind. She wears quite an array and would have that in common, but again, not sure if they would know each other, especially considering Lisette's tendency for introversion.

HOWEVER! Molly will know Kirsten from classes, even though they're in different houses. Molly loves Kirsten. She likes hearing about faraway places so she'd be fascinated by her being from Sweden!