Elias Farrell
Romeo and Elias are most certainly friends. I see no reason why they wouldn't be. They both work at the Foundation, they both work at shops that sell potion ingredients on the DL, and I think they are close to the same age.
Therese will be someone whom I look forward to playing around with again.
Iris will know of him since he will be around on the weekends. She will likely be respectful.
Marcie and he could know each other. Maybe even friendly.
Not sure if I have anything for you with Kara though. I mean, maybe the fact that she's his daughter, but really, what can we do with that?