Monkey D. Luffy
is a fictional character in the "One Piece" franchise created by Eiichiro Oda. She is based on Ann and Silk, two characters from Oda's previous manga "Romance Dawn". She is introduced as a thief and pickpocket who possesses cartographical, meteorological, and navigational skills. At first, she is a subordinate of the fishman Arlong, but she is eventually freed of this service and permanently joins Monkey D. Luffy to fulfill her dream of creating a complete map of the Grand Line.