Oreille "Madame"

A known underworld information broker and specialist for having vast information and knowledge on a number of subjects, she recruits Hei to take down the Section 3 convoy before he cuts off all contact with her. She is also known to the CIA, having met with one of their agents named Mr. Smith to locate Hei after he went rogue again.

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It is revealed that she had a relationship with Mao sometime in that past, and calls Mao by the name Ricardo.

source: Wikipedia.

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It is eventually revealed that as part of Shion's plan Oreille and Doctor Pavlichenko has built a super computer that has all the records of the world, observed by the Doll Network and all memories of mankind gathered by the ME Network.