Unlike anyone else from other nations, prior to the events of Natlan's Archon Quest, Natlanese don't leave Natlan. So Hoyo can't use the usual 'Not Around' reason that they pull for others (like Mizuki or Escoffier).

And considering that everyone fought in the war against the Abyss, and that the Traveler toured all the tribes, closely-knit family-like establishments, rather intimately under the guidance of friends, it's a little difficult for Vision Holders to pass under the Traveler's radar without a good explanation.

So how are they going to add any new Natlan characters?
Narratively speaking, how are they gonna introduce new Natlan Characters?