o hey! Julie here, and seems like Miles here is the best avenue for plot. I'm assuming she has some sort of dynamic with Rhys? Miles is basically bffs with him, and has a complicated screaming friendship with Audrey (who is a member of his thieving crew), so he and Chloe could definitely have known each other for years. He also grew up in an orphanage and has complicated bitter ungrateful feels about that arrangement, but presumably these two would never speak about it -- it could be interesting if they accidentally came across the subject at some point in-game, though, to show how they gloss over deeper subjects despite being friends? If they are friends. Etc.
I also have Ofelia consultancy who is a 37yo gambler, former orator, and would totally partake of Chloe's inventory; maybe she's like Ofelia's Q?
Emily-wise, I picked up another mage back in December (Wolfe abstention) who spent some 20 years as a black mage, so that's a potential point of connection. Rictor templars also fought with her during the cure mission, vaguely knew of her before her death (is a fellow noble), and totally believes the nice girl act, so there's that.