Nefertari Vivi is the princess of Arabasta. She is the daughter of Nefertari Cobra and Titi.

She debuted as one of the main antagonists of the Reverse Mountain Arc as a Bounty Hunter; under the Baroque Works codename Miss Wednesday. During this time, she was partnered with fellow Frontier Agent; Mr. 9. However, after the events during the Whisky Peak Arc, she and her pet super spot-billed duck Karoo ended up joining the Straw Hat Pirates for most of the Arabasta Saga after revealing herself to be a spy plotting against Baroque Works. She left the crew after defeating Baroque Works to stay in her home country, but has been shown to be keeping track of the Straw Hat’s progress.

Vivi is a young woman with long wavy light blue hair, with two locks hanging down, one on either side of her head, which started out at about chin-length but were past her shoulders by her last appearance before the timeskip. She most often wears her hair pulled back into a ponytail, and brown eyes. She has a slender body but tends to wear less-revealing clothing than Nami and Robin do. Vivi has been seen wearing several different high heeled shoes, including white high heel boots, white high heel sandals, and blue wedges.

Though she is a princess, she rarely wore clothing that would suggest her royal status while traveling with the Straw Hats, although she started to do so more regularly after her coming-of-age speech.