Mr. 6

Mr. 6 (ミスター・シックス, Misutā Shikkusu) is the partner of Miss Mother's Day and a Frontier Agent in the Baroque Works rankings. He was first mentioned by Nefertari Vivi, who explained the system of the organization to the Straw Hat Pirates. Neither him nor his partner is seen in the series. His ranking suggests that he is considerably stronger than the other Frontier Agents.