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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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2 Answers 2

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Strength (Physical)

A body's physical strength it not defined by it's 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 shouldn't 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.

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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.

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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.

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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

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

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.

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

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Brilliant answer.Honestly, even if I had gone my way to self answer it, I wouldn't have come up with such a detailed one :) –  R.J Jun 19 at 12:44

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 Chopper's all devil fruit ability and Chopper(in Sanji's body) can't use his power at all.

Haki using Ability It will change because Haki mean 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 body) can use Smoke Smoke ability and her haki is not very well and luffy easily beat 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 body) will not stand for a punch of nami(in Franky body).That shows Strength don'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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I wish you'll pleasure. :) –  Halo Jun 19 at 9:45
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+1 for the references. Also for future reference, instead of actual quotations, a picture from the manga/anime would have been fine also in this case (in my opinion). For example showing Tashigi or Franky use any Devil Fruit specific feature and showing Sanji mentioning that Nami's body is much weaker before he jumps into the river or something. People like pictures anyway ^^ –  Peter Raeves Jun 19 at 9:48
    
@Peter Raeves Thanks for advices :) –  Halo Jun 19 at 9:55
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@Halo - In the docs here, search for "Sanji used his Kenbunshoku Haki" and you'll see what I'm talking about. –  R.J Jun 19 at 10:35
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@R.J I see ^^. Since multiple answers are encouraged, I'll try my best to answer too then –  Peter Raeves Jun 19 at 10:59

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