Mangekyo Sharingan

Mangekyo Sharingan
The Mangekyo Sharingan (万華鏡写輪眼, Mangekyō Sharingan?, literally "Kaleidoscope Copy Wheel Eye") is a heightened form of Sharingan. It was first awakened by Madara Uchiha,[36] who was able to use it to gain control over the Nine-Tailed Demon Fox. Over the generations other Uchiha came to possess their own Mangekyo Sharingan,[37] though Madara Uchiha, Itachi Uchiha, Kakashi Hatake, and Sasuke Uchiha are the only characters to have possessed it in the current Naruto storyline. Unlike the standard Sharingan, the Mangekyo Sharingan's appearance and abilities differ between users, changing the form of the Sharingan's tomoe seal when activated and usually granting the user a number of unique abilities. Those who possess a Mangekyo Sharingan suffer from ever-deteriorating eyesight, a process that becomes faster through repeated usage and culminates in blindness.[38] Only by taking the eyes of a sibling can one's eyesight be permanently restored, combining the two Mangekyo Sharingan and granting them immense strength in the process.[39]

When the Mangekyo Sharingan is first introduced, Itachi tells Sasuke it can only be gained by killing one's closest friend.[40] Though Itachi and many other Uchiha have done this to obtain their versions, at least one other method exists: after Itachi himself dies, as a person with whom Sasuke shared a close relationship, Sasuke's Mangekyo Sharingan is awakened. Which, if either of these methods, Kakashi used to gain his own Mangekyo Sharingan remains unknown.