Kodama

They're spirits who live in the trees of the forest and they are similar to dryads in greek mythology. They also worship the Forest Spirit.

Appearance
They are little white people who different size rattling head almost similar to bobble heads and they have two small black eyes.

Abilities
Disappear- They can appear and disappear at will

They also sometimes they guide travellers and other people out of the forest.

Trivia

 * The survived Kodama seen at the last of the film later turned into Totoro.