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In the context of the crew, Nico Robin is the to join the Straw Hat Pirates . She is an archaeologist with the power of the Hana Hana no Mi (Flower-Flower Fruit), which allows her to sprout body parts on any surface. 2. The Seven Warlords (Shichibukai)

There is also a minor antagonist named Mr. 7 , a sniper for the Baroque Works organization during the Arabasta Arc. pov_vinasky072518-7.jpg

The number "7" in your query likely refers to a few key "7s" within the One Piece series: 1. The Seventh Straw Hat: Nico Robin In the context of the crew, Nico Robin