The Noppera-bo (Noppera-bo?), or faceless ghost, is a Japanese legendary creature. Noppera-bo (or Nopperabou) appear to be ordinary humans but they are actually shape shifters. They usually appear to the victim as someone they know before erasing their facial features to scare them. Theyre also known as a no-face or faceless ghost and they are known to be mischievous rather than malevolent. A favourite game of the Noppera-bo is to work in teams, where one of them scares a victim who then flees and finds another person walking late at night. The victim frantically relates their story to the stranger until they reveal that they too are a Noppera-bo. Although the Noppera-bo is considered a yokai due to its long history in Japanese culture, there are modern reports of sightings, including in Hawaii which has cultural links to Japan.

http://theunexplainedmysteries.com/Faceless-Ghost-Nopperabou.html