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We know that Haki is a mysterious power present inside every individual. But
only few people are able to awaken and use it. It is very closely related to
the willpower of a human being. So the question which arises here is: Does the
use of Haki affect the user (physically or mentally) in any way? Does
excessive use of Haki take a toll on the user?

  * If it is so, how exactly does it affect the user, since Haki isn't something like a physical energy?
  * If it isn't so, why don't the Haki users use it all the time? Why do they use it only in specific cases like a battle, or entering enemy territories, etc?


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2014-04-11T06:17:29.490
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one-piece
Does the usage of Haki affect the user in any way?


Haki can be of three type. Conqueror's Haki, Color of Armament, Color of
Observation.

Haki is basically used during fights to one up the opponent where some
opponents are powerful enough to avoid one's sight or are able to attack
faster.So there is no reason why it should be used at every time.Normally
one's other senses are enough for fight.

Conqueror's Haki- It cannot be used repeatedly (IMO). It is kind of mentally
exhaustive.Also till now there have been only 4 character to be shown using
this type. Rayleigh, Luffy , Chinjao and Doflamingo. Of these only Rayleigh
can use it to affect selected targets as he did at auction house. Luffy is
till now unable to use this to its full potential. Maybe it can be used
continuously but luffy can't use it continuous till now.

Color of Observation- It can be used regularly as shown by Enel. He used it to
spy on people's conversation. No other character till now have any situation
to use it continuously.

Color of Armament- It gives the user an external protective covering to
minimize effects of physical attacks.But it does affect the person who is
using and also the person on whom it is used. Chinjao used it to counter
luffy's punch but his was no match for luffy. so his physical appearance
changed. Also Vergo wasn't able to match up to Law. And sanji's leg cracked
while attacking Vergo.


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**Does it affect the user (physically or mentally) who is using the Haki in
any way?**

  * No. I encourage anyone to point out otherwise, but my memory says Haki isn't proven to be exhausting. The conclusion I draw from that is that it's not a **powerup** (i.e. energy drawn from an inner pool of life force/chakra/ki/Namekian-hand-holding).

**Does excessive usage of Haki take a toll on the user?**

  * N-- but yes. By nature, excessive activity will generate stress but in accordance with my above answer, _this is just an unlikely result_.

**If it is so, how exactly does it affect the user since Haki isn't something
like a physical energy?**

  * Haki is akin to concentration to activate, which also makes it task-orientated. Things like Observation are always on, because these are your most basic senses. As long as the user is conscious, there will be a heightened sense of plot convenience—I mean, the ability to detect hostile presences like the "wild beast" in Fishmen Kingdom's Palace. For Armament, this is used only for strengthening, i.e. intensifying the muscles. This is like getting in the zone, turning on that killer instinct, you know what you're about to do and you're gonna do it. So while the user can turn it on at the tip of a hat, there's no point to stay amped up and flexed. That's like walking around with a balled up fist all the time. Haki isn't going anywhere else. Nor is it a get-out-of-Death-Flag card that activates when your enemy has gone too OP or you're a pummeled mess. 

My train of thought: Haki users are just flexing and intensifying their basic
characteristics of observation, density, and intimidation. So it is physical
energy if you take all the potential energy and turn it into kinetic energy
for battle. Since it's not a powerup but more of a concentrated assault
mindset, the training makes more sense. It wasn't for the purpose of
controlling the uncontrollable, but for developing this state that allows you
to demonstrate more strength like knowing how to brace your forehead with
hardening for a headbutt or tighten a fist to punch. Not to undersell it, I'm
sure the power behind one Haki-shrouded punch will make the difference versus
another eventually, but it's never been the deciding climax to a fight.


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Haki requires a certain amount of energy to use. Since Haki refers to the will
power of the user, **it uses mainly mental power**. Though we all know that
thinking too much for a long period or intensively thinking about things,
makes you tired and thus drains your energy.

It seems that **Observation Haki** cannot be turned off and is the odd one of
the three in that sense (Eg: Enel knows what everybody says at any time, Aisa
and Cobi kept hearing people's, driving them insane at first). Here, it does
not costs you energy to turn the ability on, but rather to keep yourself sane
hearing so much voices at the same time for all time. It must have been so
intense, that it would have been impossible for Whitebeard (due to his
illness) to concentrate on everybody around him during the Marineford War,
giving Squard the opening to stab him. As mentioned by Crocodile and Marco, he
should have been able to sense and avoid that attack.

Releasing **Conqueror's Haki** requires concentration, making it a bad move to
use excessively. It would only drain precious energy and wouldn't really
effect stronger opponent anyway, so unless you want to intimidate or maintain
a badass image like Shanks it wouldn't make much sense to continuously release
it.

Finally, **Armanent Haki** requires the most concentration and energy of all
forms of Haki. Coating for a long time or coating large surfaces takes a major
toll on the mind and body. The user might get used to using such amounts of
Haki over a long time, but it would drain their energy pretty rapidly.

> Luffy fully coated his body but was completely worn out after doing so for
> only 20 minutes. Additionally, using such amounts of Haki took such a huge
> toll on his body, that Luffy was rendered unable to even stand and needs at
> least 10 minutes to **regenerate his Haki** , before attempting to do
> anything else again.  
>  
>  ![enter image description here](https://i.stack.imgur.com/CxXi7m.png)  
>  
>  [![enter image description
> here!](https://i.stack.imgur.com/8jOyIm.jpg)](https://i.stack.imgur.com/8jOyI.jpg)


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> Due to the fact that [Haki](http://onepiece.wikia.com/wiki/Haki#cite_note-
> Transfer_Haki-6) originates from an individual's spirit and not their body,
> even if the user's spirit is transferred into another body, they are still
> capable of using Haki as if they were in their original body.

This tells me that Haki does not affect users Physical strength as such.

> [Haoshoku_Haki](http://onepiece.wikia.com/wiki/Haki/Haoshoku_Haki) is the
> only one that is not used excessively since it might affect the innocent
> people with weak will power or is not needed once you already knocked down
> the opponents.
>
> [Kenbunshoku Haki](http://onepiece.wikia.com/wiki/Haki/Kenbunshoku_Haki) and
> [Busoshoku_Haki](http://onepiece.wikia.com/wiki/Haki/Busoshoku_Haki) are
> used as often as needed to keep on monitoring your opponents activities and
> defending against their attacks.


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2014-07-17T22:24:51.487
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