Kage Kage no Mi

The Kage Kage no Mi, also known as the Kage Kage Fruit, is a Paramecia type Devil Fruit that gives the user the manifest and control shadows as a tangible physical form. "Kage" means shadow. It was eaten by Gecko Moria. It's powers were first noticed on Brook when he first dined with the Straw Hats.

Strengths
The major strength of the fruit, as demonstrated by Moria, is that it's user is able to manifest shadows into a physical form. With this the user is able to grab hold of their victim's shadow. They are then able to cut it with a pair of scissors as if it were cloth. With the shadow, they are then able to place it into a lifeless corpse in order to create a zombie minion. The minion that is created retains the mannerisms and abilities of the victim. The minion, however, is only as strong as the body it is composed of. It also appears that the minion by itself doesn't inherit any Devil Fruit powers of the original owner of the shadow. Though the minion doesn't inherit any Devil Fruit powers, the Kage Kage no Mi user can manipulate the minion's shadow so that it's body can simulate the body changing abilities, such as those of some Paramecia Devil Fruit users, of the original owner. The original owner on the other hand, is forced to remain in darkness otherwise they will vaporize if hit by sunlight.

The Devil Fruit user also has full control on whether or not the shadows return to their original owners. Simply beating the user, or even killing them, will not return the shadows the user has stolen. The user must face a shadow animated zombie and say that it should return to it's master in order for a shadow to be fully returned.

The user is also able manifest their own shadow as a semi-liquid physical form. They are then able to control their shadow and make it fight for them in their stead. Their shadow, as a physical manifestation, is a being of strengths similar to that a Logia Devil Fruit user as their shadow, in that state, is impervious to receiving damage. It is also able to change shape and size depending on the user's wishes. The user is also able to switch places with their shadow in order to get to different places. The moment when the user switches places with their shadow can also be used to dodge attacks in a similar fashion to when a Logia type Devil Fruit user transforms into their element in order to dodge an attack.

Weaknesses
One of the major weaknesses of the fruit is that the user can only fully control minions whose shadows come from owners who are relatively weaker than them. Minions with shadows that come from relatively strong owners are harder to control. One example of this happening is when a Dog Penguin zombie with apparently Sanji's shadow fought against the other zombies to protect Nami. Despite this however, no matter how strong the shadow is, sooner or later it will forget it's memories of it's original owner and obey Moria completely.

If a zombie given a shadow from this fruit's power is fed salt, it will cause the shadow to return to its original owner. This is because salt is an element of the sea (salt water), which takes away Devil Fruit powers. A shadow will also return to it's original owner if the corpse housing the shadow is completely destroyed.

The most major weakness of the fruit, however, is that the shadows that were created by the user's powers can be used against them. After a zombie minion is purified, the shadow that is freed can be caught by anyone. They can then implant that shadow into themselves or into an ally. If the person is still conscious, they can then gain the abilities of the shadow's original owner and become stronger. More than one shadow also can be implanted into them thus their strength can be multiplied by the number of shadows implanted into them. However because the shadow that is implanted into a living person is not of the same soul, the shadow will only stay in their body for ten minutes. Afterwards, the shadow will return to it's original owner. Also, the number of shadows that can be implanted into a person is somewhat limited to how strong the person's spirit is. If the person's spirit is weak, they'll lose consciousness and the effects of the shadows will go down the drain. For most regular people, two or three shadows is the limit for them.

Other than that, the user is also affected by the standard Devil Fruit weaknesses.

Usage
The fruit's bestowed powers, as used by Moria, have been used mostly to create a large number of zombies in Thriller Bark. With it, he has been able to steal various shadows from various people who unfortunately stumble across his island. With the help of Hogback's surgical ability to create all sorts of creatures, and a large freezer filled with tons of corpses, Moria has been able to create a large army of the dead.

Moria is also able to use the powers in battle in a manner suiting his personal motto. Moria is able to manifest his shadow into a dark semi-liquid like silhouette figure resembling himself. This being is capable of being impervious against conventional attacks. This being is also capable of splitting itself into smaller bat-like shapes. Overall, Moria mostly uses his shadow to both attack enemies and protect himself without raising a muscle himself in both cases.

The named techniques that are used by Moria that involve the Devil Fruit are as follows:


 * Doppelman (影法師 (ドッペルマン)): The name of the a dark silhouette like figure Moria made using his own shadow. With this "shadow clone", Moria can use it to fight in his stead. It's name is derived from doppelgänger. This was first seen being used against Luffy.


 * Black Bat (欠片蝙蝠 (ブリックバット)): Moria transforms his "shadow clone", Doppelman, into a myriad of balls. This balls then turn into a swarm of bats that can attack an opponent. After being used, the bats can merge back together to reform Doppelman. This was first seen being used against Luffy.


 * Kage Kakumei (影革命 (カゲかくめい), Shadow Revolution): Moria implants his shadow into a minion. With it inside he is able to manipulate the shape of the minion's shadow. When the shadow's shape is changed the minion's body will be changed too. This is first seen being used on Oz. Moria is able to do this because of the general rule about shadows. It is common knowledge that a shadow will always comply with the body casting it. Because of that the shadow and the body are always the same shape. By changing the shape of the body's shadow with Moria's powers, the body is forced to match the shape of the shadow. In effect, it's the reverse of a shadow changing shape to match with the body casting it because it is the body that is now transforming to match the shape of the shadow it is casting. It's basically the reverse of shadow puppetry.


 * Oz Ball (オーズボール): Using Shadow Revolution on Oz's shadow, Moria changes Oz into a gigantic ball to crush his opponents. This was first seen being used against the Strawhats and Brook.


 * Kagemusha (Shadow Warrior): A technique in which Moria can swap places with his Doppelman at any time, making it very hard to hit him. The technique was first demonstrated but not properly explained when Moria lead Luffy to the forest and switched with his shadow when Luffy caught him. This was properly shown and explained later when Robin attempted to snap his neck with four gigantic arms. This technique's name comes from the term used in Japanese to refer to an impersonator.

The fruit's powers have also been used outside of Moria's own will by some of Moria's victims. They have learned how to harness the fruit's ability to make shadows tangible for their own benefit against Moria himself. Over the years, while trying desperately to recover their own shadows, they have learned that they can capture shadows that have been purified from Moria's zombie minions. With these, they have learned that they can put the captured shadows into themselves and gain the abilities of the shadow for a short period of time. Using this knowledge, they were able to imbue Luffy with a hundred shadows and turn him into Nightmare Luffy.

Trivia

 * The way Moria steals shadows from his victims, by cutting it off like piece of clothing from their feet, resembles the concept of Peter Pan's own clothlike shadow.