Negojii is a forest spirit encountered by Miyori, appearing among the spirits who greet her upon her return to the forest. As part of this collective, Negojii recognizes Miyori as the forest's designated guardian. The spirits, including Negojii, persistently interact with Miyori despite her initial reluctance and skepticism toward both their existence and her assigned role.

Negojii's involvement occurs primarily within group settings where the spirits collaborate to support Miyori. This includes participation in communal efforts confronting external threats to the forest, such as the dam construction project and hunters posing as researchers. Specific individual actions, distinct characteristics, or a dedicated background story for Negojii are not detailed across available sources. The character functions as one component of the broader spirit community integral to Miyori's journey and the forest's protection.