Nami

"Cat Burglar" Nami is the navigator of the Straw Hat Pirates and one of the Senior Officers of the Straw Hat Grand Fleet. She is the third member of the crew. She is the adoptive sister of Nojiko after the two were orphaned and taken in by Bell-mère. Nami was formerly a member of the Arlong Pirates and initially joined the Straw Hats so that she could rob them and buy back her village. She joined the Straw Hats after they defeated Arlong. Her dream is to make a map of the entire world