Naruto: The Mangekyo Sharingan, Explained

gamerant.com:

The Sharingan is one of the most powerful Kekkei Genkai to exist in the world ofNaruto. Introduced quite early into the series with Kakashi Hatake, this eye was said to be the copy wheel eye, meaning it holds the power to copy all forms of ninjutsu, genjutsu, and taijutsu, and see through them, unless they are Kekkei Genkai or Hiden abilities. This eye also grants the user a tremendous advantage in battle as it can see through even the fastest and the most intricate of movements, allowing them to react accordingly. As most fans know, this eye is exclusive to those with the Uchiha bloodline and currently, very few of its users are alive.

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That said, every user of the Sharingan holds tremendous potential as this eye carries limitless powers. The Sharingan's power is greatly dependent on pain and misery, which makes it quite a tragic power to wield. When someone experiences a great emotional shock, most likely sad or one full of desperation, This eye is often triggered into awakening. As it does awaken, it also starts to consume the user with hatred which is born out of the loss of love or the need to protect. As the hatred grows, so does the power of this eye. What's even more interesting is that the Sharingan can turn even stronger when the user witnesses the loss of a loved one. This triggers the evolution of the Sharingan into the Mangekyo Sharingan.

The Mangekyo Sharingan is an advanced form of the Sharingan that only a few characters in the series have tapped into. First awakened by Indra Otsutsuki, this eye is known to feed on the hatred inside the user which is born out of the loss of love. Madara Uchiha and Izuna Uchiha were the first members of their clan to