This is possibly a bit outdated, and it's not about third person pronouns for once.
My nephew is about to marry someone whose pronouns are entirely obscure to me, not because of her gender but because in her native language there are eleven words for "you" in the singular, but not one which captures
my relationship with her, so I can call her anything I like in the third person (i.e. she/her - I don't think her first language has gendered pronouns) but have no idea how to talk to her directly because there's no word for "you" when the addressee is one's fraternal nephew's partner in her language.
We have it easier here in Europe because on the whole we have familiar and polite singular and plural second person pronouns, but nowadays we have parasocial relationships as well as familiar and respectful ones, and these are often neither of the above. So what do you call someone you've only met online:
* but know really well
* but don't know well
* and are meeting face to face for the first time but didn't know well beforehand
* and are meeting face to face for the first time but knew well beforehand
* any of the above with someone you're meeting in any form for the first time
* any of the above with someone you know well face to face
* Two or more of any of these in the same combination
* Two or more of any of these in different combinations
?
By my count I think this is three dozen pronouns, but I may be miscounting.
BUT WHAT DO YOU CALL THEM?!?!?!
I don't know what to do here. Not a problem in English because of our weedy little pronoun system with only one word for "you".
Dunno.