This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Fomorian (Irish)
The Fomorians or Fomori are a supernatural race in Irish mythology, who are often portrayed as hostile and monstrous beings. Originally they were said to come from under the sea or the earth. They are enemies of Ireland's first settlers and opponents of the Tuatha Dé Danann, the other supernatural race in Irish mythology; although some members of the two races have offspring.
They are often portrayed as monstrous.Sometimes they are said to have the body of a man and the head of a goat, according to an 11th-century text in Lebor na hUidre (the Book of the Dun Cow), or to have had one eye, one arm and one leg. However, those Fomorians who have relationships with the Tuath Dé, such as Elatha and his son Bres, were portrayed as darkly beautiful.