Is Vivi a Celestial Dragon?
Nope. Although her family belonged to the one of the 20 Kings who participated in Alliance during Void Century , They did not move to Mariejois.


  The World Nobles, also known as the Celestial Dragons, are direct descendants of the founding kings who moved to Mariejois. As such, these Nobles possess the authority to do as they please, simply due to their heritage.