"Of old, there was Sauron the Maia..."

“In all the deeds of Melkor the Morgoth upon Arda, in his vast works and in the deceits of his cunning, Sauron had a part, and was only less evil than his master in that for long he served another and not himself. But in after years he rose like a shadow of Morgoth and a ghost of his malice, and walked behind him on the same ruinous path down into the Void.”

"Hades? Persephone?

Sauron, everytime he needs to seduce someone for power:

“…he was a mighty cat and coal-black and evil to look upon. His eyes were long and very narrow and slanted, and gleamed both red and green, but his great grey whiskers were as stout and as sharp as needles. His purr was like the roll of drums and his growl like thunder, but when he yelled in wrath it turned the blood cold, and indeed small beasts and birds were frozen as to stone, or dropped lifeless often at the very sound.”