

When a Mangekyou Sharingan is replaced with someone else's eyes in an attempt
to obtain Eternal Mangekyou Sharingan, do the eyes retain the host's powers or
the donor's Ocular powers? Also, why can a "sealed Sharingan" merge to form an
Eternal Mangekyou?


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naruto
Do the eyes retain the host's powers or the donor's Ocular abilities after it's transplanted to obtain Eternal Mangekyou Sharingan?


# They probably keep the powers of the previous host.

From the [wiki](http://naruto.wikia.com/wiki/Mangeky%C5%8D_Sharingan):

> Although these eyes merge the designs of the two Uchiha's Mangekyō
> Sharingan, **they're still the eyes of the previous owner** and thus react
> to certain techniques that are aimed at the original owner's Mangekyō
> Sharingan.

However, we've only seen two Eternal Sharingans, on Madara and Sasuke. We do
not know the eye powers of Madara's brother, and Sasuke and Itachi had the
same powers, so we cannot infer solely from manga that the original host keeps
his powers.


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In Sasuke's case, He kept his own powers, so its most likely the case that the
wielder keeps their own powers.

Itachi's powers were Amaterasu and Tsukuyomi. Sasuke's powers are Amaterasu
and an unamed power I will call Amaterasu Control that let him control
Amaterasu as if it was Gaara's sand, and put the inextinguishable flames out
at will. We see this power clearly in that Itachi only ever shot Amaterasu out
like a gun from his eye, hitting whatever he was looking at. We see Sasuke not
only do the same, but also put out the flames and shape them, such as into
spikes, on his own hands like Chidori, or even to coat Susanoo in them and
create a shield so that they spread to the attacker.

After Sasuke obtained the EMS, he still used Amaterasu control to the same
degree, but he never used Tsukuyomi because he couldn't. In Chapter 585,
during Sasuke's fight against Kabuto,

> he and the Reanimated Itachi cast genjutsu on eachother to break out of
> Kabuto's Genjutsu. Itachi used Tsukuyomi, while Sasuke used regular
> Sharingan genjutsu.

If Sasuke was able to use Tsukuyomi, that would have been the time to use it,
but he didn't. Instead he keeps on using Amaterasu Control for precisions
attacks using Amaterasu. The best example I can think off right now, In his
Final fight in the main series

> against Naruto, Sasuke uses Universal Pull to bring in Naruto and his few
> Shadow clones, and then surrounds himself in Amaterasu flames. Then he
> creates spikes around his whole body made of the black flame just before
> Naruto and his clones reach Him, piercing all the shadow clones, and Naruto
> barely dodges by using his Chakra cloak to grab onto the flames.

TL;DR he still uses Amaterasu Control after obtaining the EMS, but genjutsu
wise only ever uses Sharingan Genjutsu. Thus the most likely answer is that
they keep their origional powers. The unique special powers of the other
individual are most likely lost, replaced with the other perks EMS has.


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AFAIK Due to overuse of the Sharingan the eye loses its light(i.e The user
can't see). The second set of eyes is to solely bring back the vision to the
host but that will not give any new powers to the user. It will just enable
the user to use Mangekyō eternally without any problems.


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