This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Yuxa (Tatar)
Yuxa, or Sly Snake, is a legendary creature that figures in Turkic folklore. According to popular beliefs, every 100-year-old snake is transformed into Yuxa. In fairy tales, Yuxa is described as a beautiful damsel who would marry men in order to beget offspring.
Yuxa sometimes spelled Yuha, is a legendary creature with a dragon's head, which may be said to breathe fire or possess a venomous bite, a reptilian body, two legs (sometimes none), and a barbed tail. It can turn into handsome young men and beautiful young women to seduce, protect or terrify the people around them as their whim dictates.