Hi Taya! I'm Allie and I'm late to the party here.
So, as far as plot through Riley goes, I've got Dillon (stillwithyou) who is her extremely nerdy little brother and who Shoshanna will probably meet at some point. Also there's Noah tankslayer) who is falling in love with Riley and just doesn't know it yet, and also hangs out at Riley's camp with her fairly often.
For other plot! Ellie (witchchild) is still pre-med at the moment, but she's also using plenty of magical healing and potions before she's officially a doctor, so she and Shoshanna would have plenty to talk about. And Ellie's probably going to have plenty of questions about the kind of medicine that Djaq knows, because Ellie has questions about literally everything. If Briar does lure Shoshanna over to the clinic, Shane (howtocarryit) does some work there as a counselor when he isn't Avengering and Lily (seeinghope) is a nursing student who works at the clinic, too.
There's probably way more that I'll have to throw at you eventually but that seems like a good place to start. Catch you on Discord!