This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Ghillie Dhu (Scottish)
In Scottish folklore the Ghillie Dhu or Gille Dubh was a solitary male fairy. He was kindly and reticent, yet sometimes wild in character. He had a gentle devotion to children. Dark-haired and clothed in leaves and moss, he lived in a birch wood within the Gairloch and Loch a Druing area of the north-west Highlands of Scotland. Ghillie Dhu is the eponym for the ghillie suit.
According to folklorist and scholar Katharine Briggs the Ghillie Dhu was a gentle and kind-hearted mountain spirit, or a "rather unusual nature fairy." The Ghillie Dhu was an individual male modern day fairy described a fairy was generally timid, yet he could also be "wild". Generally of a dishevelled appearance, he used green moss and leaves taken from trees as clothing. He had black hair, was of a small stature.