For My story, I have chosen to combine several of the "little people" myths that I have heard, including dwarves, elves (the small kind), hobbits, and sidhe (hill people) the result is a race that is very diverse with varying characteristics and abilities depending on where they live. All of my Gribthyn are short, three feet tall at most, and they are more in tune with nature than big folk. The Gribthyn that reside in the mountains are stockier than their non-mountain kinsmen and are very good at stone working. The Gribthyn of the forest are thinner and slightly taller than their non-sylvan counterparts, they speak to animals and are good with plants. The Gribthyn of the plains and hills are the most average, and they are skilled farmers and weavers. All Gribthyn are nimble and secretive, but very friendly with strong family ties.

Fascinating! I like the fact that you have well-developed culture threads that run through them all, despite the similarities and differences in their bodily forms. Culture is crucial to a good book.

More about the Gribthyn and how they interact with big folk: The plains- and hills-dwelling Gribthyn on average are the most "domestic" for lack of a better word. They have towns and villages with a close sense of community. In general, they engage in trade and other activities with the big folk more readily than the Gribthyn of the mountains or forests. There are a few more feral hill-dwelling Gribthyn that avoid all contact with big folk unless it cannot be avoided. The forest-dwelling Gribthyn usually live in temporary structures and camps. Moving around the forest with great ease they tend to avoid human contact as a matter of course; but if you can find them, they welcome visitors and are kind hosts, allowing visitors to remain until they move on to a new campsite. The mountain-dwelling Gribthyn build great strongholds and carve cities out of the rock. They are mostly self-sufficient, but they have developed a taste for human ales and ciders and so have established a strong trade relationship with farmers and brewers, trading tools and services for food and drink. The mountain-dwelling Gribthyn will never turn away a guest, but they will also never allow an outsider to witness or learn their mining or smithing techniques.

You did a great job! They sound amazing!