Hey, no! Not at all, humans are just as interesting as any other race. Tbh, you can make them native of Riverain if you want, but you can make up pretty much anything you want to for their backstory or just in general. I totally don't mind you writing in new countries and cultures or continents, or even defining one of the places I listed in that long word-blob under setting. Feel free to take the reigns! I can't expect you to know what's in my head, so we'll have to make up stuff as we go, anyways.

Sorry I've already written so much for this! I don't want to scare you into feeling like you can't be creative in this setting, because that's not the case, I just obsessed over it to the point where everything has a placeholder name or description already - placeholder being keyword. ^^'