- "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!"
- ― Silvers Rayleigh explaining Haki to Monkey D. Luffy at the start of his training. (One Piece)
- Fighting Spirit Manipulation
- Haki (One Piece)
The users of this power can manipulate energy formed from their ambitious strength and willpower to be enable them to achieve feats such as reading others' movements, to bypassing any defenses an ability may provide via contact or even knocking a person unconscious.
One Piece Universe
- Kenbunshoku/Observation Haki: Enables the user to sense the presence of others and even predict an opponent's moves making attacks much easier to evade. Combining with abilities that allow the user to read airwaves can allow them to eavesdrop at a far distance. Advanced users can see into the future.
- Busoshoku/Armament Haki: Can be channeled throughout the user's body/object to act as an armor, increase the strength of the user's strikes and also enable the user to strike the real body of the user with elemental intangibility. Advanced users can project the effect a short distance from themselves, allowing them to attack opponents without physical touch and cause internal damage.
- Haoshoku/Conqueror Haki: The user can dominate and overwhelm the wills of others and even knock those with weaker wills unconscious using their own willpower. It can also allow the user to command animals and possesses charisma of a king's. Advanced users can affect the environment physically.
- Enhanced Charisma
- Chi Manipulation
- Enhanced Hearing
- Enhanced Reflexes
- Force Armor Generation
- Life-Force Manipulation
- Unknown Inducement
- Willpower Manipulation
- Meredy (Fairy Tail)
- Users of Dying Will Flame (Katekyo Hitman Reborn!)
- Satsuki Kiryūin (Kill La Kill)
- Users of Haki (One Piece)
- Users of Spiral Energy (Tengen Toppa Gurren Lagann)