Trafalgar D. Water Law

Trafalgar Law is a pirate captain and doctor. He is one of eleven pirates who have been referred to as "The Eleven Supernovas" on Sabaody Archipelago whose bounties are higher than  100,000,000 when the Straw Hats arrive in the place.

Abilities and Powers
Law is a doctor whose skills have earned him the nickname of "Surgeon of Death". As for his weapon, he carries a katana with a scabbard decorated with crosses from the opening to the bottom.

History
Not much is currently known about him other than the fact that he appears to be very laidback, as he was first seen sitting ontop of a crate as another pirate with a high bounty passed by, X Drake. He then asked how many did the latter slay.

Later, after Eustass Kid mentioned that he is mannerless, Law replies by flipping his middle finger up. He was sitting next to a bear like creature.