Furfur illuminates the heavens with his lightning flashes, and the ground-dwellers believe that what inevitably follows a lightning strike is a storm. In concordance with this, Furfur swoops down to those he frightens with his lightning on a thundercloud.
In demonology, Furfur (other spelling: Furtur) is a powerful Great Earl of Hell, being the ruler of twenty-nine legions of demons. He is a liar unless compelled to enter a magic triangle where he gives true answers to every question, speaking with a rough voice. Furfur causes love between a man and a woman, creates storms, tempests, thunder, lightning, and blasts, and teaches on secret and divine things.
He is depicted as a hart or winged hart, and also as an angel. To some authors he changes from hart into angel when compelled to enter the magic triangle.
'Furfur' or 'furfures' in Latin means "bran ". However it seems more likely that the name is a corruption of 'Furcifer' the Latin word for scoundrel.