Nico Robin

Nico Robin is the archaeologst of the Straw Hat Pirates, She was originally introduced as the vice president of Baroque Works, known as Miss All Sunday, Before joining the Straw Hats She is the seventh member of the crew, the sixth to join, and like Nami and Usopp is the second the rejoin doing so near the end of the Enies Lobby Arc. Robin is also the first member to have once been an antagonist.