This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Nian (Chinese)
A nian beast is a beast in Chinese mythology. Nian live under the sea or in the mountains. The Chinese character nian more usually means "year" or "new year". The earliest written sources that refer to the nian as a creature date to the early 20th century. As a result, it is unclear whether the nian creature is an authentic part of traditional folk mythology, or a part of a local oral tradition that was recorded in the early 20th century.
Once every year at the beginning of Chinese New Year, the nian would come out of its hiding place to feed, mostly on people and animals. During the winter, when food was scarce, it would raid villages, eating the crops and sometimes the villagers themselves - particularly their children.