Following on from Faye Valentine, let's cover Fujiko herself and some insight into her design.

Fujiko Mine is a master thief who frequently teams up with the Lupin gang mostly for her own interests and she's one of the few characters who can act on Lupin's level, but her original creation was quite different.
Late author Monkey Punch designed Fujiko as the woman of the week, inspired by the women of Ian Fleming's James Bond stories and films, so called Bond girls, sexy femme fatales that the lead character can hook up with or become a convenient plot device to drive the narrative.
As the franchise continued, readers were confusing the female characters as the same character and Fujiko was born, becoming a foil for Lupin as well as the prototype for all femme fatales that followed, the irony of becoming her own character is that her origins became more mysterious which gave us the art house project Woman Named Fujiko Mine as well as allowing her more freedom in her design as the decades go on.
Definitely a worthy contender for best female character in anime.