Oooh, that's tough. I'd have to say in general, Selkies.

But I think they're all fascinating. Clavats are farmers, sweet but strong. The Lilties aren't all that much anymore, but they strike me as holding on to the fact that they once ruled the world. (Sorta kinda like modern Greece.) Selkies just rock, I love their clothes and hair. But I have a different culture in my mind that what the game portrays a lot of the time. Go figure. The Yukes are so mysterious! Shella is perfect as their city. And what is with the masks? I've just gotta know. (Note to self: Must include explaination in fic.)