Jumeau

Jumeau is a female youma under the control of Nephrite in episode 018. Her mission is to gather the energy of doll maker Mika Kayama once she reaches her peak energy output. Nephrite puts his evil crest on a French doll made by Mika, causing her to become obsessed with making ten replicas of the doll and hastening her approach towards her peak energy output. Jumeau has a doll-like, disjointed white body and blue hair. She wears no clothing except for a necklace bearing Nephrite's evil crest. Jumeau gets her name from a type of antique French dolls made by the doll maker Pierre Jumeau. These dolls were made during the 1800s, and they look almost exactly like the dolls that Mika Kayama makes.

The dolls are highly prized among collectors.

(Source: The Oracle :: BSSM Encyclopaedia)