Charlotte Linlin

Big Mom (ビッグ・マム Biggu Mamu) is the last Yonkou to be named.

Appearance
Big Mom has not shown herself thus far, but her silhouette is visible in Garp's explanation of the Yonkou.

Abilities and Powers
As one of the Yonkou she is one of the three(formerly four) most powerful pirates of the One Piece world.

Trivia

 * Big Mom was the only one of the yonkou to not be involved in the Whitebeard war in any way.