Raen lore question

[Naria]

If you haven't already I'd check out the naming convention post for Au Ra, and the official website summary of them. The lore book doesn't really have more more on them as a race then what these two posts cover.

The Raen are suppose to be rare, so there is less information about them in game than the Xaela. At some point they likely lived on the Steppe like the Xaela (its the Dawn Throne after all), and at some point they left or were driven out and became a diaspora. When ever this happened was long enough ago that neither the Xaela or the Raen seem to bring it up casually anymore.

As was mentioned by Yuriane, everything we've seen indicates that Sui-no-Sato is atypical, so your best bet is probably making your character Hinagan, Doman, or first-generation Eorzean. Technically speaking I suppose you could probably make them Garlean as well, since Garlemald has conquered most of Orthard and there are probably pockets of Raen all over the continent. There is also one Xaela tribe that takes in Raen that is mentioned in the naming convention post.

Hinagashi seems to be based off of Tokugawa era Japan with Kugane being the foreign trading port a la Nagasaki, and Doma seems to be a mix of Japan and Imperial China. So if you are up for a bit of historical research that may help you out. The lore book does have some info about the Garleans that isn't available anywhere else, mostly a historical timeline and naming conventions if that is they way you want to go.