Queen Mab
The Faerie Queen of the Winter Court & the twin sister of Titania.
Where is she from?
Queen Mab is a character from the long running Dresden Files book series by Jim Butcher, the banner-carrier for the Urban Fantasy genre. She's a powerful queen of the Fae, so it stands to reason that in the world of GND, Jareth would be on a first name basis with her. She never appeared in the short lived Dresden Files series, so there's no depiction of her available. This is is a piece of artwork by redditor BroFistYT.