The Surgeon of Death  is a pirate from North Blue and the captain and doctor of the Heart Pirates. she is one of twelve pirates who are referred to as the "Worst Generation" she became one of the Seven Warlords of the Sea during the timeskip,[ but her position was revoked for allying with the Straw Hat Pirates.[13] Law, like many other pirates, dreams of finding the One Piece, while also desiring to know the purpose of the Will of D. 

her weapon is called: kikoku (demon wail) a katana