Mr. 12 is the partner of Miss Saturday and a Frontier Agent in the Baroque Works rankings. He was first mentioned by Nefertari Vivi, who explained how Baroque Works was organized to the Straw Hat Pirates.
Mr. 12's appearance is unknown, as neither him nor his partner are seen in the series. It is assumed that the number 12 plays a major part of his design, similar to the other Frontier Agents designs.
Nothing is known about Mr. 12's personality, but it can be assumed that he is brutal and willing to kill to complete a mission like other agents.
Abilities and Powers
Nothing is known about Mr. 12's abilities, but his number (higher than 10) means he is not much stronger in the Baroque Works number system than the Billions.
At one point, Mr. 12 joined Baroque Works. He worked his way up the organization to achieve the high position of Frontier Agent and became partners with Miss Saturday. He is never seen in the actual series, but is mentioned by Vivi during her explanation of Baroque Works.