For my guy (name forthcoming. lol.) Since he'd be Everman, I think he and Nathan could be good friends? They'll be about the same age. And he'd obviously know the rest of everyone. An ex girlfriend for him would be fun, if you have anyone who you'd like to fit for that?
Also, Elliot is adorable!
For Hannah - she wouldn't KNOW anyone, but she and Genevieve are about the same age, and she works for Hannah's brother?