The following mainly comes from initial traditional tribes in general, not including tribes who have mixed origins and other case-by-case variable exceptions.
As one of the nine foundational tribes, the [Tree swinging Fabric-strip Demon Tribe] were initially as several of separated tribes who had associated customs on arboreal-lifestyle. After receiving their own Grimm-form,
[Grimm-form appearance]
black strips on face
black stripes spinning around the limbs (usually one stripe on lower part while other one stripe on upper part)
[Grimm-form ability]
Combat Application:
[Societal Aspects]
Cultural Aspects