One Piece NICO ROBIN

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Robin joined the Straw Hat Pirates after Luffy saved her life, or (how she states it) Luffy forced her to live when she wanted to die. To atone for his crime, Robin demands that Luffy allow her to join his crew, to which he complies leaving every other crew member except Sanji in shock. Although feared at first, she is quickly accepted and viewed as a comrade by the crew.