Duncan is the only one who would have really been around when she was first visiting during their high school years, but I don't know that he'd have had much overlap there? (Lorelei would have been around, but too much of an age gap there, I think.)
Thomas has a canon connection with Ian, though they haven't found that in game yet. Still, tenuous something there!
Marlene loves that she helps rescue puppies. :)
These days, Lorelei, Duncan, and Gareth have public-facing jobs, so they'd be open for random interactions!