Well, how big is the lgbt community in the real world?
1%? Maybe less?

That means from 100 NPCs one is part of it.
So to meet 2 we have to meet about 200 different NPCs.

Also, they are normal just like everyone else, so from the small interactions we have with random NPCs we can Not say if the are LBGDT or not.
And if I remember right, then we already have met a few gay NPCs.
Well the whole azim step is full of NPCs who doesn't care about genderspezific roles.