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 the Straw Hats. She is the seventh member of the crew, the sixth to join, and, like Nami and Usopp, is the second to rejoin, doing so near the end of the Enies Lobby Arc. Robin is also the first member to have once been an antagonist.