This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Iratxoak (Basque)
Iratxoak are the imps of Basque mythology. Usually benevolent, they help with farming labors in the night if given presents of food. Galtxagorriak are a specific kind of iratxoak. Their name means the red-pants.