There is currently an issue with Hytale's Update 3 where the server will fail to load with the mod installed. The solution to this is just checking the "skip mod validation" in the world settings. I'm working on fixing this properly though. 

Video Showcase:

At the moment the Guide, Merchant, Nurse, and Dryad are available, but the rest of the NPCs will be added over the coming weeks. All of the NPCs are available in Survival mode, by crafting them in the HyRise bench, which you can craft from the Workbench.

Dryad

The Dryad will sell and buy nature related items like moss, plants, and petals.

Nurse

The Nurse will sell you healing related items like Potions and Blood Petals.

The Nurse can be crafted with Blood Petals, a Health Potion, and Greater Essence of Life.

The Guide

The guide is designed to be the first NPC you find (make), and so his trades are tuned to help you out the most in the early game, giving you basic tools and food, and buying basic materials off of you.

To craft the Guide, you'll need 10 berries, 1 crude Pickaxe, and 1 Crude Hatchet, allowing you to unlock him very early on.

The Merchant can be crafted with 10 berries, an Iron Pickaxe, and an Iron Axe.

Check out the full mod!

Like the rest of HyRise, this mod is still under development. The actual barters right now are placeholders until I have a more fleshed out collection of custom items.