She is a young, tall woman with long blue hair and black eyes. She wears a long white dress with some pink details on it, and a yellow headpiece with a red gem piece at the front. In the manga, there is no red gem.
When Disco brought Pascia to the auction stage, Sanji asked Nami if they could buy her as well (during their attempt to buy Keimi's freedom), annoying Nami and Chopper and provoking them to hit him.
Pascia is seen again when Franky throws the keys to the other slaves in the Auction House, shortly after Rayleigh got things under control. She presumably escaped successfully.
Pascia's appearance is slightly altered in the anime. Her top originally had a tattoo-like design on the sleeves, which was removed. Also, a red gem was added to her headpiece.
In the anime, when Pascia was placed onto auction, Sanji expressed anger that the sellers would do such cruelty to a beautiful girl, as opposed to the manga, where he simply asked Nami to buy her as well.