Haki

Haki (覇気 - Ambition) is one of the 2 leading types of power in One Piece.

Haki is a mysterious power that allows the user to utilize their own spiritual energy for various purposes.

It can be used to sense people's spiritual energy and predict their actions, give the user a protective coating of spiritual energy, and, for a certain group of "chosen ones", overpower the willpower of others.

All living beings in the world are capable of learning Haki; however, most people do not notice it or fail to awaken it.

Color of Arms Haki
Color of Arms Haki (武装色の覇気 - Busō-shoku no Haki, lit. Colors of Armament Ambition) is a form of Haki that allows the user to use their own spiritual energy to create, in essence, an invisible armor around themself, providing incredible offensive and defensive capabilities.

Notably, this form of Haki can be used to injure Devil Fruit users that are otherwise immune to ordinary physical attacks, such as Logia users.

Users

 * Monkey D. Luffy
 * Roronoa Zoro
 * Sanji
 * Bellamy
 * Dracule Mihawk
 * Smoker
 * Tashigi
 * Rob Lucci
 * Blueno
 * Kaku
 * Jabra
 * Kuzan
 * Borsalino
 * Sentomaru
 * Marshall D. Teach
 * Jesus Burgess
 * Trafalgar Law
 * Boa Hancock
 * Jimbei
 * Edward Newgate
 * Marco
 * Jozu
 * Vista
 * Sakazuki
 * Shanks
 * Sabo
 * Issho
 * Donquixote Doflamingo
 * Diamante
 * Pica
 * Cavendish
 * Charlotte Linlin
 * Charlotte Perospero
 * Charlotte Katakuri
 * Charlotte Smoothie
 * Charlotte Cracker
 * X-Drake
 * Kin'emon
 * Okiku
 * Kozuki Oden

Observation Haki
Observation Haki (見聞色の覇気 - Kenbun-shoku no Haki, lit. Color of Observation Ambition) is a form of Haki that grants the user a sixth sense that allows them to sense the presence, strength, and emotions of others, as well as gain limited precognitive abilities.

Users

 * Monkey D. Luffy
 * Roronoa Zoro
 * Nami
 * Usopp
 * Sanji
 * Coby
 * Vergo
 * Dracule Mihawk
 * Smoker
 * Tashigi
 * Bellamy
 * Marshall D. Teach
 * Jesus Burgess
 * Eneru
 * Kuzan
 * Blueno
 * Rob Lucci
 * Kaku
 * Jabra
 * Monkey D. Garp
 * Borsalino
 * Sentomaru
 * Trafalgar Law
 * Boa Hancock
 * Jimbei
 * Sakazuki
 * Sengoku
 * Edward Newgate
 * Marco
 * Donquixote Doflamingo
 * Diamante
 * Pica
 * Cavendish
 * Charlotte Linlin
 * Charlotte Perospero
 * Charlotte Katakuri
 * Kaido
 * Charlotte Smoothie
 * Charlotte Cracker
 * Okiku
 * Kin'emon

Conqueror's Haki
Conqueror's Haki (覇王色の覇気 - Haō-shoku no Haki, lit. Color of the Supreme King Ambition) is a rare form of Haki that allows the user to exert their own willpower over others. This type of Haki cannot be attained through training and only one in several million people are born with this ability.

Conqueror's Haki considered an extremely dangerous threat and a highly valuable asset by powerful groups such as the Marine Admirals and the Four Emperors.

Users

 * Monkey D. Luffy
 * Roronoa Zoro
 * Shanks
 * Portgas D. Ace
 * Boa Hancock
 * Edward Newgate
 * Sengoku
 * Donquixote Doflamingo
 * Charlotte Katakuri
 * Charlotte Linlin
 * Kaido
 * Kozuki Oden