Haki

Haki is a mysterious power that is found in every living being in the world. It is not that different from the typical senses. However, most people do not notice it or fail to awaken it. Broadly speaking, there are two types of Haki available to everyone, given the proper training; however, there is a third type that only a certain group of "chosen ones" are said to possess. In simple terms, Haki is an ability to sense spiritual energy (Kenbunshoku), use life force as physical reinforcement (Busoshoku) and overpower enemies willpower with your own (Haoshoku).

In Wano Country, Haki is known as the Ryuo (流桜).

Overview
"Haki" is a power that lies dormant in all the world's creatures... "Presence", "fighting spirit" and "intimidation"... It is not different from the things that humans can naturally sense such as these... 'The act of not doubting'. That is strength! Haki, unnamed at the time, was first seen when Shanks used it to scare off the Lord of the Coast to save Luffy when he was a child from the wrath of the Sea King. The term "Haki" was first coined and used much later when Blackbeard was commenting on Luffy's bounty in Jaya, and was hinted at during Shanks' visit with Whitebeard.

The underlying concepts of Haki were introduced during the Sabaody Archipelago and Amazon Lily Arcs. The concept was clearly explained by Rayleigh to Luffy at the start of the latter's training on Rusukaina Island. Haki is dormant in every living person, but it's rare for most people to ever awaken that ability. Intense training can awaken it, as can extreme shock, such as with Koby during the Battle of Marineford. Two known people (Aisa and Otohime) were born with the ability awakened, with no known training. Due to the fact that Haki originates from an individual's spirit and not their physical body, users are still capable of using it even if their spirit is transferred into another body. Haki can also become stronger, especially when a Haki user battles stronger opponents.

Despite their great capabilities, Haki is not limitless as it can be depleted from overuse, rendering the user unable to use it for a set period while it regenerates.

Types of Haki
Haki is separated into three categories, or "types" (色), each has levels of usage, so that even two proficient users might not be of equal strength. Most people who can use Haki tend to have a type they are better at and as a result focus on that type. However, a person can improve their abilities with all the types of Haki, it just requires more work. Furthermore, at least two types of Haki can also be used simultaneously.:


 * Kenbunshoku Haki, which grants users a sixth sense of the world around them and limited precognitive abilities. Users can hone their skills to such a degree that they can achive an advanced level that allows them to see a short period into the future, as seen with Charlotte Katakuri. Enel used his Devil Fruit, the Goro Goro no Mi, to significantly increase the range of his detection radius.
 * Busoshoku Haki, which allows the user to use their spirit as armor to defend against attacks or to make their own attacks more potent. Some users of Busoshoku use the Koka Technique over their entire body and\or weapons. Users can hone their skill to such a degree that they can achive an advanced level that allows them to emit the armorment a short distance without a medium. Furthermore, when clashing against another Busoshoku Haki user, the one with the lower level will feel the impact to a certain degree, ranging from swelling, to physical changes.
 * Haoshoku Haki, a rare type of Haki only one in a million people can use which grants the user the ability to overpower the will of others. This normally results in the victims being knocked unconscious. Users of this type of Haki are seemingly somehow ranked, as Chinjao claimed that one could become "the top of all the conquerors".

Haki Users
It was mentioned that all Marines with the rank of vice admiral and above, are capable of using Haki. So far the characters who have clearly shown the use of Haki or have been stated to be able to use it are:

Anime and Manga Differences

 * In the manga, those hit with Haoshoku Haki foam at the mouth after or while losing consciousness, whereas in the anime, they simply faint.
 * In the anime, use of Haoshoku and Busoshoku Haki creates a rippling or shockwave-like effect, similar to the Gura Gura no Mi, while in the manga, it is completely invisible. Also, in recent episodes, use of Haoshoku Haki causes the affected area, excluding the user, to gain a dark blue tint. However, this could just be for dramatic effect. In the One Piece Film: Z, the Haoshoku Haki's use creates a circular purple wave.
 * In the last anime episode before the time-skip, use of Busoshoku Haki as "invisible armor" was shown as a swift percussion forming a light-blue beam, similar to lightning, while in the manga, it is shown simply as an amplified impact, nothing else visible is shown.
 * In the anime, some Haki users are shown surrounded by different color auras, (such as red for Luffy, purple for Doflamingo or pink for Big Mom) even if they are not using Haki at that moment.

Translation and Dub Issues

 * The term "Haki" is a word that has multiple meanings when translated into English. It can mean "ambition", "will power", "drive", "spirit", "vigor" and "aspiration" to name a few. The term itself however, literally translates to "Supreme Qi".
 * In the simulcast episodes by FUNimation, the subs provided have chosen to use the term "Haki".
 * Regarding the video games of One Piece: One Piece: Unlimited Adventure and One Piece: Unlimited Cruise, which were localized by Namco-Bandai, "Haki" was translated as "Ambition". But beginning with One Piece: Pirate Warriors, also localized by Namco-Bandai, it was left as "Haki".

Trivia

 * Haki appears to be similar in principle to common types of Qi (Chi) found in various other anime and manga series; which is based on the concept of "qi" (or "life-force") in Chinese philosophy.
 * Coincidentally, the kanji for the "ki" in Haki is the same as the same character/hanzi used for qi/chi (気). By this proxy, the pinyin reading of Haki would be Baqi ("bah-chee").
 * Not only is it a Japanese term, but Haki was also the name of a Scandinavian Sea-King (a name given to powerful pirates) in Norse mythology.
 * In the anime, some animals seem to be able to learn to competently use Haki (particularly Busoshoku Haki). This has so far happened twice:
 * Alpacacino, member of the Neo Marines, was shown using Busoshoku Haki to damage Luffy;
 * The Kung-Fu Dugong captain of the Sea Animal Pirates.
 * Ryuo shares same pronunciation with the Dragon King (龍王).

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