Devil Fruits are the main source of power in the world of One Piece. The vast majority of the pirates in the Great Pirate Era, along with other powerful fighters in the story, have eaten Devil Fruits. The select few who stand among the elites without any Devil Fruit powers are avid users of Haki.
Haki is yet another powerful ability in the One Piece world that only a handful of people can make use of; however, there are other ways to reach the top as well without using it. While Haki and Devil Fruits are surefire ways for one to establish themselves among the elites, they are certainly not the only ways.
Fishman Karate is one of the strongest martial arts styles in the One Piece world. It is primarily used by the Fishmen and the Merfolk; however, it can also be used by normal humans if taught properly. Fishman Karate relies on the basis of the manipulation of water in the atmosphere.
Since most things in the surroundings, including humans, have a high content of moisture within, Fishman Karate can manipulate it and deal damage from within. This form of fighting is extremely impressive, as seen on several occasions in the story already. Jinbe, the Helmsman of the Straw Hat crew, is a master of Fishman Karate, and he is yet to show the fans what he can do with it to the best of his abilities.
The Rokushiki is another powerful style of fighting in the One Piece world that is known to be unique to the World Government. It was most likely developed by the strong fighters within the ranks of the Government and, sometimes, it also extends to the members of the Navy. The Rokushiki is usually utilized by the members of the Cipher Pol.
During the Water Seven saga, fans saw the CP9 make use of these powers. While some of them are Haki-based, such as Tekkai, others have no connection to Haki and deserve a special mention, such as Soru. Those who have mastered the Rokushiki gain access to a unique ability called the Rokuogan, which allows the user to fire powerful shockwaves from their fists, capable of dealing damage from within. Rob Lucci is the only user of this ability so far.
Several races in the world of One Piece are blessed with their own special abilities. The Lunarian race is, quite possibly, the most overpowered race in the One Piece world. Although now nearing extinction, the Lunarians are known to have an incredibly high tolerance for harsh conditions, such that they can survive in nearly any physical environment.
Those of the Lunarians have white hair, brown skin, giant black wings, and an eternally burning flame on their back. They have an incredibly high defense, and even the strongest attacks in the series will have trouble piercing their armor. They also have the ability to manipulate flames easily. At the same time, those who possess the power of the Lunarians can also gain extreme speed in exchange for their high durability. Without a doubt, this race would make one overpowered even without the use of a Devil Fruit and Haki.
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