Sharingan n Mangekyou Sharingan

Sharingan

The Sharingan (写輪眼, Sharingan? literally "Copy Wheel Eye," English manga "Mirror Wheel Eye") is an eye technique (瞳術, dōjutsu?) that naturally occurs in a select few members of the Uchiha clan. The Sharingan is thought to be descended from the Byakugan,[34] but grants the user different abilities and a different insight. The Sharingan does not automatically appear from birth in a user; instead, it will usually appear when the user is in a life-threatening situation, where the power of the Sharingan could save them. After this first appearance, the user can then call up the Sharingan any time they wish. The power of the Sharingan is judged through the number of tomoe in the eye, with a maximum of three in each. The characters who currently possess the Sharingan include Sasuke Uchiha, Itachi Uchiha, Kakashi Hatake, and Tobi.

The Sharingan's first and most well known ability is to memorize any technique that it witnesses. It can memorize any standard form of jutsu with perfect accuracy, allowing the user to use the techniques as his own. In order to reproduce copied jutsu, however, one must have the necessary skill or ability to perform them. A prime example is Rock Lee's Strong Fist taijutsu. While Sasuke was able to copy some of Lee's moves, they put a much more significant strain on him since he hasn't had the same training as Lee has.[35]

The Sharingan's second ability is granting the user incredible clarity of perception, allowing them to track fast-moving objects with ease and even predict the subsequent movements of those objects.[36] The ability to track and predict movement is largely based on individual skill, as unskilled users have much more trouble tracking fast-moving objects. A fully-evolved Sharingan eye can track even the quickest opponents, though, like the first ability, it doesn't necessarily mean the user has the ability to react to it.[37] This perception is also great enough to see through genjutsu and to observe the movement and flow of chakra, but not to the same extent or clarity as the Byakugan.[38] It also gives color to chakra. Additionally, the Sharingan grants the user exceptional analytical powers, allowing them to instinctively pick up on various visual clues with little difficulty. For example, Sasuke was able to reproduce answers on another person's test by watching their pencil movements during the Chunin Exam.[39]

The Sharingan's third capability is a unique brand of hypnosis that involves suggesting actions and thoughts to the opponent. When used in conjunction with the aforementioned aspects of the Sharingan, this allows the user to perfectly mimic every move their opponent makes, even before they do, making it appear as if the user can see the future.[40] It also allows for other forms of hypnotism, such as putting an opponent to sleep, replaying memories to someone else, or creating various illusions to fool an opponent.

It is possible to transplant Sharingan eyes from one person to another, as occurred with Kakashi and his deceased comrade Obito Uchiha.[41] However, transplanted eyes do not work as well in a non-Uchiha body; Kakashi's eye is always active, causing him great strain when he uses it and forcing him to recuperate for extended periods of time after a battle. Kakashi keeps it covered when not using it to avoid this side effect in his everyday activities. Uchiha clan members are not burdened with this weakness; while activation of the Sharingan does consume chakra, the drain is so small as to be almost insignificant. Itachi in particular seems to have no trouble keeping his Sharingan activated near-constantly.

IGN has described the Sharingan as one of the best abilities that a ninja could have but, due to its main power being imitation, has also said it is not particularly original.[10]

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,[42] 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,[43] though Madara, Itachi Uchiha, and Kakashi Hatake are the only characters to possess it in the current Naruto storyline. Unlike the standard Sharingan, the Mangekyo Sharingan differs between users, changing the form of the Sharingan's tomoe seal when activated. Those who possess a Mangekyo Sharingan suffer from ever-deteriorating eyesight, a process that becomes faster through repeated usage and culminates in blindness.[44] Only by taking the eyes of a sibling can one's eyesight be permanently restored, combining the appearances of the two Mangekyo Sharingan and granting them immense strength in the process.[45] The left eye of the Mangekyo is said to be strongest in genjutsu, while the right eye seems to specialize in ninjutsu. Why this is, is thus far unknown.

Itachi tells his brother, Sasuke Uchiha, that the Mangekyo Sharingan can be gained by killing one's closest friend.[46] Though Itachi and many other Uchiha have done this to obtain their versions, Kakashi is unlikely to have done the same; Kakashi states at the start of the series that all of his friends are dead, and it is not until the gap in time between Part I and II that he develops his own. What Kakashi did to obtain his own Mangekyo Sharingan remains unknown.

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