The Hinna Hinna are a series of human hunter-gatherer tribes whose culture is very different from the rest of the humans of Nippon.
They wear robes created with thread extracted from the bark of the elm tree. It has long sleeves, reaching almost to the feet and are rolled around the body and tied with a sashl. On winter they wear animal pelts with deerskin leggings and boots made of dog or salmon skin.
They hunt with a bow and poisoned arrows. Their diet basically consists of deer, bear, fox, wolf, badger, ox and horse meat, as well as fish, crabs, oysters, birds, millet, fruits, vegetables, herbs and roots. They usually exchange their game with the niponese in exchange for things that they do not produce. They live in huts roofed with reeds, the largest reach almost 7 meters, without rooms and with a place for the fire in the center; They don't have a chimney, just a hole in the ceiling; they only have one window on the eastern side and two doors.
These tough hunters know the dangerous forests and mountains of Nippon like the back of their hand and the Oni lords always try tto recruit them as guides and scouts in their armies where in addition to guiding and helping supply the troops they serve as elite archers.
You can learn more about the Nippon the Oni shogunate fan project here: https://www.worldanvil.com/w/warhammer-fan-concept3A-nippon-the-oni-shogunate-danilagi7