Miss Mother's Day is the partner of Mr. 6 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 Mother's Day's appearance is unknown, as neither she nor her partner are seen in the series.
Nothing is known about Miss Mother's Day's personality, but it can be assumed that she is brutal and willing to kill to complete a mission like other agents.
Abilities and Powers
Nothing is known about Miss Mother's Day's abilities, but her ranking suggests that she is considerably stronger than the other Frontier Agents.
At one point, Miss Mother's Day joined Baroque Works. She worked her way up the organization to achieve the high position of Frontier Agent and became partners with Mr. 6. She is never seen in the actual series, but is mentioned by Vivi during her explanation of Baroque Works.