RTF is a global modification that replaces all towns in the game.

Understood.
And which concept do you rely on the most?
I would try to come up with a description or even several options for the snake-like creatures, at your discretion.

It's hard to say for now; the concepts change along with the units.

For now, it's the Outcast Clan, hence the Shark Guards and Stream Spirits. The Kirin is a questionable unit – if possible, I'll replace it, but they also had their own concept, like these are spirits that are exiled from the Lotus Empire for their villainous nature. There, it's still a peaceful paradise with an overpowered Empress who simply collects the tears of Ashi as a resource, but that's not the point. It's a small unit; it needs to be changed