ALL THE SISTER THINGS. And Sofia sort of facepalms a bit at Lia but will tolerate her as long as she doesn't do anything actively dumb, I think. She's got a reasonably high tolerance for annoying right until they swerve into actively endangering themselves or other people.
Friends for Archie and Dorian sounds good! And he'll be welcoming to any fae who want to hang around and chat, so Lia's welcome.
I think for Adelaide and Eirena, possibly more of a someone to touch base with regarding how her magic and her condition intertwine, because it is a bit of a unique situation. She's got a psychiatrist who's been very helpful, and she's got things under pretty good control, but someone who knows about magic whose job it is to listen to people talk would be a godsend, I think, because up until now she's had to keep the two sort of separate. She'll definitely be up for helping Dorian as much as she can, and will prooooobably shrug off Damascus's dickishness XD
Mel DOES NOT TRUST DAMASCUS as far as a toddler could throw him, but I think he enjoys talking with him all the same.