Going on my skimming over it, I'm wondering if you and I are on the same page.
What I tried to describe is something very similar to like being influenced by my siblings. Or kids in the neighborhood that I grew up with. Or teachers/professors I studied under. Or people I've dated.
I find that if I spend a certain amount of time with someone IRL who impresses me in some way, then stuff like their accent, their vocabulary, their way of seeing things will start rubbing off on me.
Are you talking about that kind of thing, too?