I've run out of brain power apparently. But the quick hits
Alex: BIRKHOFF. 'nuff said. And then she's rooming with Anna. Plus she and TJ will have a lot to bond over.
Hope: She'll probably get along with Skye and Caleb in various ways.
Kara: TJ AND KARA BESTIES. So much sunshine. Pls keep sunshine to self before 8am, Kara.
Lissa: Caleb can probably be a friend
Sam: Skye is the same age. We can see what happens there
Veronica: no real idea yet but Birkhoff would probably be totally willing to help with any kind of setup/backup/support should she want to open up shop.