This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Furu-utsubo (Japanese)
Furuutsubo are the beloved quivers of slain archers who died particularly tragic deaths. These quivers—along with other arms and armor—develop life force due to the residual energies left behind by their owners. They begin to move around on their own. Together with Kazusa (no suke) (deputy governor of Kazusa Province) Hirotsune, Miura no suke allegedly shot down a nine-tailed fox in Nasunogahara.
The most famous furuutsubo was the quiver which belonged to Miura Yoshiaki, a military commander who lived at the end of the Heian period. Yoshiaki was a brave warrior, skilled in sword and bow. As the enemy was bearing down during a terrible siege, Yoshiaki arranged for his household to escape from the castle. Yoshiaki stayed behind to defend the castle against the invading army. He sacrificed his life. After his heroic death, his favorite quiver was heartbroken at the loss of its master. It took on a life of its own and became this y?kai.