Mr. 6

Mr. 6 is the partner of Miss Mother's Day and the top 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.

Appearance
Mr. 6's appearance is unknown, as neither him nor his partner are seen in the series. It is assumed that the number 6 plays a major part of his design, similar to the other Frontier Agents designs.

Personality
Nothing is known about Mr. 6'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. 6's abilities, but his ranking suggests that he is considerably stronger than the other Frontier Agents.

Past
At one point, Mr. 6 joined Baroque Works. He worked his way up the organization to achieve the high position of Frontier Agent and became partners with Miss Mother's Day.

Trivia

 * In an SBS, a fan asked how Mr. 7's appearance would change if he got promoted to Mr. 6's position. His mouth, nose, eyebrows and sunglasses all would have taken the shape of 6's.