I know the general rule of Golarion is "humans are everywhere, other races are localized," but halflings are supposed to have followed humans everywhere. Does this extend beyond the Inner Sea region? Are there Tian halflings, Native Arcadian halflings, Sarusan dreamtime halflings? How unusual will halflings seem to Tians?
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Your question brought some interesting images to mind of halflings serving distinct roles or positions in society based upon the culture they were born in. Assuming that humans and halflings have a sort of symbiotic relationship (wherever the humans go, there too go halflings), you can think of a bunch of different cultural variations.
In lands influenced by Cheliax, Azlant, or Taldor (i.e. most of Avistan), halflings are often manservants, valets, and assistants (or slaves).
Perhaps in Tian-Xia, halflings widely serve a spiritual function as ascetics or travelling monks, such as the komuso in Japanese history.
Until there's anything specific on the matter, I think you couldn't go wrong by picking some sort of social niche and placing halflings there.