Miss Saturday is the partner of Mr. 12 and a Frontier Agent in the Baroque Works rankings. She was first mentioned by Nefertari Vivi, who explained how Baroque Works was organized to the Straw Hat Pirates.
Miss Saturday's appearance is unknown, as she was not seen in the series.
Nothing is known about Miss Saturday's personality.
Abilities and Powers
Nothing is known about Miss Saturday's abilities, but her number (higher than 10) means she is not much stronger in the Baroque Works number system than the Billions.
At one point, Miss Saturday joined Baroque Works. She worked her way up the organization to achieve the high position of Frontier Agent and became partners with Mr. 12. She is never seen, but is mentioned by Vivi during her explanation of Baroque Works.