Big Mom

Big Mom (ビッグ・マム, Biggu Mamu?)  is one of the Four Emperors. As one of the Four Emperors, Big Mom is one of the four (now three, due to Whitebeard's death) most powerful pirates in the world. Along with Kaido, Big Mom has yet to make an actual appearance. It was also hinted that she may be the mother of Lola (from the Thriller Bark ark) although she was only referred to as "mamma" it was said that she was very powerful.