In Amphinis there are four main ethnic groups
The exiles/their descendants
The newest group of people and the people that most of Amphinians fall into. These people come from all of the other nations somewhere along the way. These people are mostly descendants from
The Xojiki and Nimhaji
The Xojiki and Nimhaji used to only live in the jungles on Twin Island and Lily Rock with the only difference @ this point being that Nimhaji tend to be more ancient sea creature than the Xojiki. They are rich in culture religion and art. Something notable about them is that you can tell if someone belongs to the Xojiki or Nimhaji or @ least follows their religion and culture by fashion. The women (usually but not exclusively) wear tall elaborate headscarves that cover most of their hair (this was mostly just the cultural fashion and functionality rather than like some huge political or religious thing. All people with long hair on the island usually wrap their hair to keep it out of the way. If u have short hair its all good no covering needed.) They have their own government which is headed by a Colli or Cihtli.
Finally The Farashq
The Farashq live in the harsh desert of Sweetfish. Even though they have accepted and opened their arms to other cultures (now) they limit contact to the outside world. Somehow similarly to the Xojiki and Nimhaji the Farashq also are rich in culture where as although more focused on intellect than art. These people are rarely if ever fish related. The people of the Farashq wear head garments similar to the other cultures however its less pretty and more functional to keep ones head from being spoiled from the sand. They have their own government which is headed by a Sultan or Sultan.
It is easy to recognize a Farashq, Xojiki, or Nimhaji as they tend to still wear elements of their cultural clothes, even outside of their homes. Most Xojiki are humans or avians, most all Nimhaji are nymphs and sirens, and most Farashq are humans or lycanthropes