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Law's _Ope-Ope No Mi_ gives him the ability to switch the hearts between 2
bodies. This is actually transferring the mind of a person to the other and
vice versa.

So the question here is, which of the below abilities of the person are
transferred along with the mind to the target body?

  * Strength (Physical and Mental)
  * Devil Fruit Power
  * Haki using Ability

It'd be nice if specific incidents/instances can citied along with each of the
pointers for reference as it would be easy to visualize and co-relate them
with the answer.


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question
one-piece
What all abilities are transferred when hearts are interchanged between bodies?


**Devil Fruit Power**

It can't change. For example, Chopper and Franky were changed their hearts. In
that case, Franky (in Chopper's body) can use all of Chopper's Devil Fruit
abilities and Chopper (in Sanji's body) can't use his power at all.

**Haki using ability**

It will change because Haki means willpower (power of heart).

**Strength (physical and mental)**

I think it can't change. My example is Sanji (in Nami's body). He can't use
his legs as well as in his own body and he can't run too fast for a long time
because Nami's lungs can't bear.

They're only my views.

I try my best to get some references from wiki.

In following case, Tashigi (in Smoker's body) can use Smoke Smoke ability and
her Haki is not very well and Luffy easily beats with Haki.

> Tashigi confronts Luffy, demanding to know what he is plotting but Luffy
> easily dodges her smoke attack and pins her down using Haki wondering why
> "Smoker" got so weak. Smoker, seeing this, attacks Luffy from behind to
> Luffy's surprise that "Tashigi" got much stronger.

In following case, Sanji (in Nami's body) will not stand for a punch of Nami
(in Franky's body). That shows strength doesn't change.

> Sanji joyously introduces himself as Nami, ripping off his jacket and
> holding up her breasts, much to Brook and Usopp's pleasure. Nami goes in to
> punch herself, but is stopped by Chopper, saying she (meaning her body) will
> die.


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answer


## Strength (Physical)

A body's physical strength is not defined by its heart, but by the actual
body. Therefore it is not switched, as we can see when Nami (in Franky's body)
wants to beat Sanji (in Nami's body) again. Nami should not be able to even
tickle Sanji, but if she would have hit him again in chapter 663, Nami's body
might have been severely injured.

[![enter image description
here!](https://i.stack.imgur.com/h1vmGm.jpg)](https://i.stack.imgur.com/h1vmG.jpg)

## Strength (Mental)

Mental strength on the other hand, does come from the heart as we can see
Sanji do extraordinary things with Nami's body. Things she would physically be
capable of, but not mentally. Like when Sanji blue walks his way to safety
after rescuing Kin'emon's torso in chapter 672.

[![enter image description
here!](https://i.stack.imgur.com/h8Thom.png)](https://i.stack.imgur.com/h8Tho.png)

## Devil Fruit Power

Devil Fruit Powers become part of the body after eaten, so the same can be
said as with actual physical strength. For example, it was Luffy's complete
body that became rubber and not his mind. Which was proven on multiple
occasions. Oars couldn't use any rubber attacks on his own after he obtained
Luffy's shadow. Tashigi could turn her body into smoke after her mind got
switched with smoker's and Franky could still change Chopper's animal forms.
With the last example, I would also like to point out that this is also a good
example where mental strength is not switched, since Franky could not control
Chopper's final form, while Chopper could, as seen on Fishman Island. I'm not
saying Chopper is stronger than Franky perse, I'm saying that if mental
strength and thus experience would have been transferred he would have been
able to control the monster.

[![enter image description
here!](https://i.stack.imgur.com/nXFbUm.png)](https://i.stack.imgur.com/nXFbU.png)

## Haki

Haki obviously also gets switched, since this literally means willpower. So if
the will gets switched, so will it's power. This can be seen when Sanji
activaly uses Kenbunshoku Haki to locate Kin'emon's torso.

> Kenbunshoku Haki is Sanji's speciality concerning Haki. When helping
> Kin'emon recover his torso from within the lake on Punk Hazard, Sanji
> actively used Kenbunshoku Haki in order to locate the samurai's torso within
> the dark water.

[Source](http://onepiece.wikia.com/wiki/Sanji/Abilities_and_Powers)

## Summary

> In the case of switched "souls", **Devil Fruit powers are maintained within
> the original body** , while **voices and other abilities, such as Haki, go
> along with the switched mind/soul** , as seen when Sanji used his
> Kenbunshoku Haki in Nami's body, due to Haki originating from the
> individual's spirit.

[Source](http://onepiece.wikia.com/wiki/Ope_Ope_no_Mi)

## Physical heart vs Mind

It should be noted that Law only switches the mind and not their actual
physical hearts. This can be seen when he switches Tashigi and Smoke's mind,
while holding Smoker's physical heart in his hand in chapter 663.

[![enter image description
here!](https://i.stack.imgur.com/AB1Shm.jpg)](https://i.stack.imgur.com/AB1Sh.jpg)

> Otherwhise it would have been chaos if Caesar would have put Law's heart
> inside himself at Dressrosa, becoming Law.


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