

It's been said that excessive use of the Mangekyo Sharingan causes blindness
and eye-bleeding, as demonstrated by Itachi. However, Obito used his Mangekyo
almost constantly nearly every time he's made an appearance. How come he has
shown no signs of pain, blindness or eye-bleeding?

My own theory on this is that the Senju DNA Madara used to rebuild his body
has something to do with it, but I have never seen this explicitly stated. If
it has, can you tell me where or explain how this works in more detail.


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2015-10-25T23:58:25.123
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2019-07-23T02:10:07.303
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question
naruto
How can Obito use his Mangekyo so often?


Obito's left Sharingan is in posession of Hatake Kakashi, so let's compare
Obito with Kakashi and the other known Uchihas.

**Hatake Kakashi**

To use Mangekyou Sharingan Kakashi needs to accumulate a lot of chakra before
he can use Kamui on Deidara's arm. The size of the object determines the
amount of chakra he needs as seen in the case where he tried to blow the neck
of Juubi with that jutsu (thus, Sahan De Silva's comment is not very correct).
Since he is not an Uchiha, he requires a lot more chakra and puts more burden
on him than it should be as he himself mentioned. Kakashi also suffered the
side effect of overusing the Mangekyou Sharingan which he mentioned during the
fight between him and Sasuke.

**Uchiha Itachi**

Itachi was seen bleeding when using his Mangekyou Sharingan, especially when
he use Amaterasu. This is due to the strain the jutsu puts on the eye. Itachi
also suffers the other side effects of losing eyesight and is in pain when
using it, although since he was dying at the time he was fighting Sasuke, it
can also be said that the pain is also from him over-exerting himself.

**Uchiha Sasuke**

Sasuke also suffered the same side effect of losing eyesight and bleeding when
using Amaterasu, much like Itachi was. Since Sasuke was healthy and not sickly
like Itachi, it can be determined that overusing Mangekyou Sharingan puts the
user in pain. He later recovered from it by transplanting Itachi's eyes and
gained the Eternal Mangekyou Sharingan.

**Uchiha Madara**

Uchiha Madara also suffered the same side effect and was thus _forced_ to take
his brother's eyes. He no longer get the negative side effects after awakening
his Eternal Mangekyou Sharingan.

Now, based on this fact, the only difference Obito has compared to the other
Mangekyou Sharingan users is that he possessed the Senju DNA. The conclusion
is, Obito didn't suffer the negative side effects of the Mangekyou Sharingan
due to the Senju DNA he possessed.


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2015-10-26T09:29:40.970
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2015-10-27T06:23:02.650
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I guess obito's power to make such frequent use of his sharingan comes from
the fact that he has hashirams cells embedded him so now that he has the
physical energy of the senju clan he shouldn't find it difficult to make use
of his mangekyou frequently


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2016-04-29T03:13:41.537
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2016-04-29T03:13:41.537
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i think obito had eternal mangekyou. in his fight against the paper akatsuki
lady he uses izanagi to rewrite his own death (same thing madara used). this
is confusing because up until this you think obito only has one eye /
sharingan since he gave his other to kakashi. izanagi causes one to lose sight
in one of their eyes. there is a scene where obito is standing over madara's
body and behind him there is a wall of hundreds of sharingan, most likely
collected from the slaughter of the uchiha done by obito and itachi. i think
obito replaced his eyes with some of these sharingan, which would explain his
ability to use izanagi and his ability to constantly use his mangekyou
sharingan without any negative side effects


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