Mel is a bit special about changelings so he's probably kind of hot-and-cold about Mo, but he doesn't much bother with proper manners anymore XD He's gone native! He doesn't turn away other fae who want to talk, though; he just made a personal decision not to have any changeling babies so seeing other changelings makes him kind of sad. And as I said up above, for Junie, he's actually a really good professor to have; behind the grumpy he'll be pretty understanding of actual issues, just not "I was drunk all weekend and didn't do my paper" issues XD
Adelaide and Junie should totally be friends :D She's been in Vancouver for a little while, so they could know each other?
Archie is flustered at the flirting XD But he's welcoming to anyone who comes into the shop unless they give him a reason not to be, so he'd be happy to talk shop with Junie.
Sofia rolls her eyes at the flirting, but doesn't object, I don't think. She's also pretty much "no punching in the shop" so she can respect Mo's stance.