トラファルガー・ロー 

Overview

Trafalgar D. Water Law, more commonly known as just Trafalgar Law and by his epithet as the "Surgeon of Death", is a pirate from the North Blue and the captain and doctor of the Heart Pirates. He is one of twelve pirates who are referred to as the "Worst Generation". He became one of the Seven Warlords of the Sea during the timeskip, but his position was revoked for allying with the Straw Hat Pirates. Law, like many other pirates, dreams of finding the One Piece, while also desiring to know the purpose of the Will of D.

Law is the only known survivor of Flevance, a town whose inhabitants suffered from a condition known as Amber Lead Syndrome. Because the disease was fatal and poorly understood, Flevance was destroyed by neighboring countries out of fear including Law's parents and his younger sister, with a young Law barely escaping alive. He subsequently joined the Donquixote Pirates, where Donquixote Doflamingo intended to make Law one of his executive officers. However, thanks to the efforts of Doflamingo's brother, Rosinante, Law was freed from the Donquixote Pirates' influence and became a pirate set to bring down Doflamingo's empire.

During the timeskip, his bounty increased from 200,000,000 to 440,000,000 before it was frozen due to his induction into the Seven Warlords of the Sea. However, after having his title revoked during the events of the Dressrosa Arc, Law's bounty was reinstated and raised to 500,000,000. Eventually, his bounty would be raised to 3,000,000,000 for his role in taking down Big Mom of the Four Emperors alongside Eustass Kid during the Wano Country Arc.

Law joins forces with the Straw Hat Pirates for a brief moment during the Sabaody Archipelago Arc and later on saves Luffy's life at the very end of the Marineford Arc. He is one of the central allies of the Straw Hat Pirates during the Dressrosa, Whole Cake Island, and Wano Country Sagas. He also acts as an ally of the Straw Hat Pirates during the movies One Piece: Stampede and One Piece Film: Red.

Inside the aura sphere, Law can exert complete control over the fabric of space, referred to as the ability to "operate" on anything within the spherical "operating room"; he can move things within the area of the sphere telekinetically and make things, including himself and other people, swap locations via teleportation. However, he cannot move other people with strong Haki very far, as they possess more resistance to Law's power. He can also swap incorporeal things, such as souls, resulting in the victims' swapping bodies. He is also able to cut things from a distance and without actually damaging them, as well as reassemble things into various combinations; he can even attach living body parts to inanimate objects. Living things cut into pieces by this power remain alive and still able to move, even if the head is removed from the body. Law can use his power to generate high voltage energy; he can generate electrical energy to shock his opponents, and he can generate a blade of energy that he can use to damage his enemies' internal organs without leaving an external wound.

This power can also be used for medical purposes; Law can completely remove harmful matter, such as drugs and diseases, from organic tissue. Additionally, he can attach new body parts to a person's body to replace destroyed body parts. He can also use his power to scan anyone within the sphere in a manner similar to an X-Ray machine.

Awakening

Law has achieved Devil Fruit Awakening, allowing him to conjure a variety of special room spheres that are applied directly to specific objects instead of a designated area, meaning those rooms move alongside whatever they are currently covering. With K-ROOM, Law can adhere a miniature room to his weapons, which then gain the ability to extend as far as he desires, harmlessly bypass anything solid and directly operate on the insides of whatever they may phase through. With R-ROOM, Law is able to create and throw a room on a particular object and dictate a specific effect to take place in it, like erasing any sound made by the object in question. This directly addresses one of the fruit's biggest weaknesses, which is the stationary nature of its regular field of range. By Law's own admission, he has not fully mastered his awakened powers and using them takes a serious toll on his stamina.

Haki

Busoshoku Haki

Law is an extremely skilled user of Busoshoku Haki. As he could bypass Smoker's smoke body, thus resulting in him being able to take down the Vice Admiral. Law later hardened his arms to block Doflamingo's Goshikito, which is powerful and sharp enough to slice Fujitora's meteorite and also took out a large portion of the palace, without getting injured at all.

Kenbunshoku Haki

Law possesses the ability to use Kenbunshoku Haki. During the Raid on Onigashima, Law demonstrated great skill in this type of Haki as he was able to sense that Luffy was defeated by Kaidou, and was also able to sense Luffy's Devil Fruit Awakening.

Weapons

Kikoku is a large version of the typical Japanese sword type known as a nodachi. It has an oblong-shaped handguard coated with short white fur, sheathed in a black scabbard decorated by white crosses from the opening to the bottom, and with a small piece of red rope tied near its opening. Law appears to be quite skilled with it, being able to slice up targets from a distance (although this effect is attributed to his Devil Fruit power). Due to its size, Law usually carries this sword over his shoulder (in contrast to the other sword-wielding characters in the series, who either carry theirs on their hips or over their backs); yet in other times, he delegates one of his crewmates (namely Bepo) to carry this sword for him. Law was able to deflect Doflamingo's strings with his sword, which is noteworthy, as Doflamingo managed to effortlessly cut everything else so far.

Law is a master swordsman, as he was trained rigorously by Diamante at a young age. Law is extremely skilled in wielding his Nodachi Kikoku, a sword about as tall as he is. Even without using his Devil Fruit abilities, Law is capable of fighting even a Vice Admiral such as Smoker, as he is able to clash against his jitte with little effort and even block extremely powerful long-range attacks such as Doflamingo's Overheat. In contrast to the ranged slashes of traditional swordsman, Law's sword slashes don’t travel but simply provide the cutting effect while his spatial manipulation within his ROOM provides the range. Through spatial slicing, he can dismember people without harming them and attach separated parts in any manner he sees fit.

Law's swordsmanship combined with his Devil Fruit powers enable him to mutilate numerous people at once faster than they can react, easily defeating Kin'emon, a master of Foxfire Style and one of Wano's most powerful samurai in this manner. He easily defeats Tashigi, a highly skilled swordswoman of the Marines, severing her sword in two in one slash, as well as taking down Scotch and his giant knife in one swift move. He also managed to mutilate Trebol, an enormous man and also one of the strongest members of the Donquixote Pirates.

Law's greatest swordsmanship feats shown so far have been defeating Vergo, one of the strongest members of the Donquixote Pirates, where the wake of his slash was capable of cutting apart Caesar's laboratory and the surrounding mountains and cutting a meteor in half.

Law also managed to wrap the rope created by Donquixote Doflamingo's attack around his sword. He was able to use his sword to quickly parry bullet strings shot at him by Doflamingo.