

Let's say Uchiha A and an Uchiha B both have awakened their Mangekyou
Sharingan. If A and B exchange their eyes, can they unlock Eternal Mangekyou
Sharingan?


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naruto
Can Uchihas get Eternal Mangekyou Sharingan by exchanging their eyes?


In the Manga, only:

  * Uchiha Madara, 
  * Uchiha Izuna (Madara's brother), 
  * Uchiha Shinsui, 
  * Uchiha Itachi(Sasuke's brother), 
  * Uchiha Sasuke, 
  * Uchiha Fugaku(Itachi's and Sasuke's father) 
  * Uchiha Obito, 

Is shown to have awakened Mangekyou Sharingan (henceforth the MS). Of those 7
only 2 is confirmed to have an Eternal Mangekyou Sharingan (henceforth the
EMS), that is Uchiha Madara and Uchiha Sasuke.

**Uchiha Madara**

Madara gained his EMS after taking his brother's MS. Note that he claimed that
his brother gave it to him. Madara did not take it from him by force. When
Madara told this story, his brother was shown to be on his deathbed. By the
time Madara gained his EMS, his original eyes has lost its light, he is
practically blind.

**Uchiha Sasuke**

Sasuke gained his EMS from Uchiha Itachi. At first he hesitated in
transplanting Itachi's eyes into his. After his eyes got worse from the
extensive use of MS techniques, he agreed to the transplantation and thus
gained his EMS. Itachi's eyes were also near blind.

There are 4 points that is similar between the two.

  * **One** is that they have their original eyes evolved into MS. 
  * **Two** , they transplanted the other eyes from their brother. 
  * **Three** they transplanted their brother's eyes when their original eyes are blind or near blind. 
  * **Four** both's brothers are dead when they transplanted the eyes.

IIRC it was told in the manga that transplantation is better done between
close relative since they are more compatible.

If, only the first two conditions are necessary for the EMS then yes, any
close relative that has awakened MS can simply exchange eyes for both to
awaken EMS. If point 3 is also need to be met then they still can exchange
eyes after exhausting their eyes, making it near blind. If point 4 is also
necessary then they can't simply exchange eyes as one needs to die before the
other can transplant their eyes and awaken EMS.


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answer


In order to activate the EMS you would need the eyes of a relative who has
activated MS the prime example of this is Obito he transferred plenty of other
sharingans into his missing eye socket as there was more than just him and
Itachi with MS during the time of the Uchiha Massacre (where he took the eyes
of uchiha that have activated at least a regular sharingan) so its safe to
safe hes at least transplanted one other eye with MS in that eye socket but
has never awakend EMS.


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2019-08-20T19:58:45.660
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Two additional points to consider as per why theyre not fused:

  1. What Madara said and did during the 4th war

  2. The uchiha rip off shin uchiha

  3. Madara said to Sasuke "maybe I should take your eyes before i get my rinnegan back" just after his full revival. And what he did to Kakashi just before being sliced in half by Sasuke was taking his (Obito's right eye) and planted it into his socket. The instinct of putting the donor eye into his eye socket probably means that the eyes dont fuse (Madara already as EMS which is why Obito's stay they same in Madara's eye socket). This also assumes the donor is still alive (Madara did say killing sasuke would be a waste of those eyes implying sasuke would resist)

  4. Shin's body is tattered with sharingans implying no matter where you put em, the sharingan will work. Why this is important is because his "children" also have the same pattern implying those who have the exact same dna would awaken the same MS with the same power. When the body is introduced to a pair of eyes from somebody else it would react differently, my guess is; if the reciever had MS, they could potentially awaken EMS when the donor MS is transplanted into them regardless of blood relation. The blood relation mightve been a theory in the manga, an assumption, misused information. 


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