So actually I need to do this for most of our chars since there's so much new context.
For Kieran: Olivia is an adjunct in Physics, Dinah and Rey are grad students, Dinah did her BA here so she'd possibly have taken a class with him. Those are the easiest connections outside of my two vampires - but Emil/Holland haven't crossed paths with the Fitzgeralds before since they've never really been in the same area. Its possible they could know each other through here because both have been here quite awhile. Emil is involved with the coven and Holland isn't.
For Dem: Well we know about Izzy cause ya know that division is a hot mess. Emil and Dem would at least be acquainted and likely him and Su as well because the ADA offices and probation would deal with detectives on cases and what not.
For Ronan: He and Rey can definitely be friends, they would be doing bar stuff together anyway so they definitely know each other. I feel like him and Olivia would get along well.
For Jared: Izzy will demand doughnuts at all times, she is still an incredibly unhealthy individual. P much the same with Dem and Jared on the who else front - Emil and Su would both be in the PD every now and then thanks to their jobs so he'd at least know them by face. Him and Rey would definitely get along though.
I can't brain right now but those are the minimal connections hahaha. You can go peruse the changes in my ladies and gent (Dinah has the most and Su is new) and you know I'm all about the plotting and torture ♥