Note: This is based off the latest manga scanned and translated by fans online and not the current manga in print. If you aren't up on the latest manga, this question contains spoilers.

Kakashi activated his mangekyou sharingan back in the war times when

he killed Rin,

but he didn't use it for such a long time.

What was the reason?

  • 2
    After answering this I'm wondering if you meant to say "Kakashi" instead of "Itachi". Since it was Kakashi who killed Rin. Or maybe you meant to say someone other than "Rin". – Gorchestopher H Oct 12 '12 at 11:25
  • I'm going to edit this question to what I think the intent of the OP wanted, or else everyone is going to read it incorrectly. As it stands now, it doesn't make sense. – spong Oct 12 '12 at 17:36
  • yes you are right mate. I meant Kakashi – Shwetabh Shekhar Oct 14 '12 at 9:17

Although his personal reasons are of course never revealed, and more than likely are due to plot reasons there are practical reasons why one wouldn't just use an ability like that all the time.

It's use deteriorates your eyesight to the point of blindness. If you don't need it don't use it.

Mangekyo Sharingan

The above is the first link that comes up when you google "Mangekyo Sharingan". Quotation:

Over time, use of the Mangekyō Sharingan's techniques deteriorates the user's eyesight to the point of blindness.


If the OP meant to ask about Kakashi, it is most likely due to what Sunpech said, the plot wasn't all there yet. Plus, consider how draining the use of the standard sharingan was on Kakashi near the beginning of the series. The strain rendered him bed-ridden due to prolonged usage. The mangekyo variant is far more draining than the base situation.

The sharingan itself was something Kakashi used very sparingly, it only follows that the far more dangerous mangekyo would be used far less.

| improve this answer | |
  • +1 I think the writer(s) didn't have it set when the manga was initially created. It's odd how Kakashi only started to use it after it was introduced through Itachi. But it's possible that he didn't know how as he's not from the Uchiha clan, and is more draining on his body. – spong Oct 12 '12 at 17:46
  • Since the question now targets Kakashi, we should take note that Kakashi was immobile for days after using the non-magenkyo sharingan for too long earlier in the series. It was too draining on his body. – Gorchestopher H Oct 12 '12 at 19:39

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