Kodama are unnamed creatures from Princess Mononoke. They are a sign that the forest is healthy.
Kodama have white skin with grey glowing eyes
The Kodama have been living in the forest before the start of the movie. They appeared when Ashitaka was helping Kohroku and an injured man and helped them get to Irontown. They later reappear when San was bringing Ashitaka to the Forest Spirit to help his gun wound, watching from the trees and ground. After Lady Eboshi cuts off the Forest Spirit's head, the Kodama start dying along with the forest. After the land is healed, one Kodama appeares, showing viewers that the forest is growing back and promising new life
- Kodama at Wikipedia