Disclaimer: Unfortunately, I don't own Princess Mononoke.
Here's what I made up: Fokkusugaaru
Fokkusugaaru ran quietly through the forest, her feet making almost no noise as they thrummed on the ground. Her twin dirks, made of fox claws, were in her hands. The young woman's red fox-fur cloak blew out behind her as she shot at top speed through the trees.
As she ran, Fokks thought about her life. She had awoken in the middle of the woods at the age of about five, wrapped in the cloak that she now wore. The dirks had been beside her, and she was dressed in a simple brown tunic and leggings.
The only thing she could remember about her past was her age, and her name, Fokkusugaaru. As she grew out of each, a new set would mysteriously appear in the same spot.
Ever since she could remember, there had been markings on her face. A blue line under each eye and a red one down the bridge of her nose. Also, blue lines extended down her cheeks from the ones below her eyes. Her fire-red hair blended with the fox-fur cloak. There was an animalistic quality to her, though she spoke the human's language.
Fokks came to the tree she was looking for and climbed nimbly up. She perched on the topmost point and gazed out over the lake.
The great Shishigami was dead and gone, but the forest had returned amazingly quickly after the tragedy. The only problem in the valley was the humans, the ones that lived in Irontown.
They had cleared away all the regrowth caused by Shishigami's death, and the putrid smoke from the forge was penetrating the entire forest. They were beginning to clear away the saplings from the mountainside, leaving it dark and horribly barren.
She noticed a group making their way into the woods, and growled to herself. A hunting party. Not only did they kill the trees, but the animals too! And Fokks had seen how much they wasted. They threw buckets of unwanted meat out over the wall, polluting the lake.
She hunted as well, but prayed to Shishigami's spirit and made sure not to kill more than she needed. She leaped down from the tree, landing on all fours.
Fokks tore off through the forest towards the hunting party. She had no problem when they moved out of sight, since they smelled of sweat and metal and smoke.
The humans gasped as she burst out of the shrubbery in front of them, dirks at the ready. Fokks ran at them, eyes blazing with fury. They turned and fled as the feral human slashed wildly.
Satisfied that the men were headed back to their filthy town, she decided to go home. Her cave was located fairly near the Shishigami's pond.
When she got there, Fokks finished a bird she had caught earlier, then curled into a tight ball. With her cloak spread over her, she was a snug, warm ball of fur. She was soon asleep.