Vivi, the princess of one of the most ancient civilization in the op world, is also a descendant of one the people who "created" the op world, but chose to stay in alabasta than ascend to the redline. So in a way, she is a celestial dragon whose ancestors forfeited their privileges, in the order of don Quixote homing. Ironically, the gorosei considers her and her dad to be traitors.
But the most compelling part of this story is that the one who occupies the OP's "Iron Throne" seems to have an interest in Vivi, as he walks up to the seat with her picture among others. But why?! I mean whats the deal with her?
I mean it makes sense for luffy's picture to be among the collection alongside BB and Shirahoshi, But what could Vivi's connection to this mysterious figure be. Also, when the gorosei kneel before Im, they asked him of the great light that needed to be extinguished from history, could it be Vivi?!