Rumpelstiltskin

Rumpelstiltskin is the eponymous character and antagonist of a fairy tale which originated in Germany (where he is known as Rumpelstilzchen).
Rumpelstiltskin played by Scottish actor Robert Carlyle in "Once Upon A Time":

So good at being evil <3

Once Upon A Time, in order to make himself appear more important, a miller lied to a king, telling him that his daughter could spin straw into gold. The king called for the girl, shut her in a tower room with straw and a spinning wheel, and demanded that she spin the straw into gold by morning, for three nights, or be executed (other versions have the king threatening to lock her up in a dungeon forever). She had given up all hope, when an impish creature appeared in the room and spun straw into gold for her in return for her necklace, then again the following night for her ring. On the third night, when she had nothing with which to reward him, the strange creature spun straw into gold for a promise that the girl's first-born child would become his.

The king was so impressed that he married the miller's daughter, but when their first child was born, the imp returned to claim his payment: "Now give me what you promised". The queen was frightened and offered him all the wealth she had if she could keep the child. The imp refused but finally agreed to give up his claim to the child if the queen could guess his name in three days. At first she failed, but before the final night, her messenger discovered the imp's remote mountain cottage and, unseen, overheard the imp hopping about his fire and singing. While there are many variations in this song, the 1886 translation by Lucy Crane reads:

Today I brew, tomorrow I bake;

And then the Prince child I will take;

For no one knows my little game

That Rumpelstiltskin is my name!

                                                                                                                                  (Wikipedia)