The Forest People are a group featured in the No.6 series who Nezumi lived amongst as a child.
Being born and living in the forest the people made it thrive and both respected and protected it. They were able to communicate with the wind, the water and the plants. They did not wish for growth or development, but merely to live quietly alongside nature. Chapter 27, Page 2
The forest itself was described as a beautiful and lush one with large trees envisioned.