I think I kind of identify with this. The various alters feel safe talking to a set of my friends who do know about my disorder (three friends who are close enough that we all (or most of us) feel safe talking to them as ourselves). One of the people talks to one of them more than the others, one talks to another to the point that he's actually basically his friend, instead of me being his friend. if that makes sense. For the most part if an alter has a friend and they don't know I have DID then they will present as me but act like them. We are really similar which makes things easier to deal with than many people seem to struggle with, because of that we're super high functioning. it's kind of nice to know that for the most part, they're all going to act like me and give my name as theirs instead of introduce themselves as someone else.