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Nico Robin is the archaeologist of the Straw Hat Pirates. She was originally introduced as the Vice President of Baroque Works known as Miss All Sunday  before joining up with the Straw Hats. She is the seventh member of the crew, the sixth to join, and the second to rejoin, doing so during the Enies Lobby story arc. She was also the first member to have been a former villain. She ate the Hana Hana no Mi.

Source from Wikipeida