For what it's worth-- we've only explored Northern Shiyang so far, but we've already found three different human cultures:
People of Ignorant descent living under Kralori rule. Some of them are OK with that, some others resent it, some others mind their own business. They worship the monstrous demon who lives below Tzu Ling.
Kralori of various clans and origins. Mostly worship Kralori deities but some of them worship other deities eg Thrunhin Da
The Untouchables. They speak Kralori but don't belong to any of the Kralori clans. They clean the city and handle the dead. They live in their own quarter where they herd giant insects. They worship Gorakiki.
Plus we have the following non-humans:
The Slug-Men†, who act as intermediaries between the Kralori and the Ignorants,
Trollkin (mostly slaves)
Merfolk in the river
† inspired by https://www.drivethrurpg.com/product/144820/YoonSuin?language=en
‡ inspired by https://imagecomics.com/comics/series/monstress