Sharingan

The is the [[dōjutsu]] [[kekkei genkai]] of the Uchiha clan that appears selectively among its members.Naruto chapter 12, page 7 It is regarded as one of the "Three Great Dōjutsu", the others being the Byakugan and the Rinnegan.Third Databook, page 313 While its powers originated from Kaguya Ōtsutsuki's Rinne Sharingan, its independent form was first manifested by Indra ŌtsutsukiNaruto chapter 670, page 12 (Hagoromo Ōtsutsuki in the anime).Naruto: Shippūden episode 461
== Acquisition ==
When a wielder of this kekkei genkai experiences a powerful emotional condition with regards to a person precious to them, their brain releases a special form of chakra that affects the optic nerves, transforming the eyes into Sharingan; for that reason the Sharingan is described as an .Naruto chapter 619, pages 14-15 Often, as per the Uchiha's so-called "Curse of Hatred", this emotion is a negative one, brought on by stress or loss.Naruto chapter 403, page 11 The emotion can also be positive, driven by a desire to protectNaruto chapter 242, pages 16-18 or reunite with a loved one.Naruto chapter 700+4, page 16 
In the anime, it was shown that usually after first acquiring this power, the user's enhanced perception will throw off their timing, causing them to overstress their bodies from trying to keep up with the increased reaction time, forcing the user to adjust to properly move with it.Naruto: Shippūden episode 454 A higher control of one's chakra is also required to maintain its power for long.Boruto episode 171 It was also shown during emotional states that begin to trigger the Sharingan's awakening, it can temporarily blur the person's eyesight until finally manifesting.Boruto episode 19 and 20 Assuming that the user is aware they have awakened the Sharingan, they are thereafter able to freely use it.Naruto chapter 27, page 4 When first awakened, each Sharingan usually will have only one , although in some case, they immediately gained two tomoe in each of their eyes. Through emotional growth of extreme conditions, the Sharingan will continue to develop, its full maturation represented by a third tomoe. When Hagoromo awakened the Sharingan in the anime, he had all three tomoe immediately. All the Sharingan's abilities are available to the user from its earliest stage, but with greater development comes greater proficiency with those abilities. Example, with full maturation, the Sharingan's ability to perceive all targets and events around them is fully developed, which can cause the user's movements to drastically differ from their earlier movements if their Sharingan matured mid-battle. 
As with any dōjutsu, Sharingan can be transplanted into non-Uchiha.Naruto chapter 243, pages 16-18 They are unable to deactivate it and its use has a greater chakra demand for them than for actual Uchiha, who need only minimal chakra to keep it active. For these reasons, non-Uchiha tend to cover their Sharingan when they aren't using it in order to conserve chakra.Naruto chapter 459, page 15 Sharingan that originate from the same Uchiha are still linked to some extent even when wielded by separate users, at times enabling those users to see the same things.Naruto chapter 604, pages 17-19Naruto chapter 651, pages 2-4
== Abilities ==
The Sharingan grants the wielder two broad abilities: the and the .Naruto chapter 26, page 13 Although the abilities are not literally restricted to certain eyes, Madara Uchiha noted that the Sharingan can only be used to its full potential when both eyes are together.Naruto chapter 602, page 15 Even within these two categories, there may exist several distinct though similar abilities:
;"Eye of Insight"
#The user can see chakra, giving it colour in order to distinguish it by its composition and source.Naruto chapter 361, page 17 Though not as capable in this regard as the Byakugan, it can see chakra through some (but not all) obstructionsNaruto chapter 579, pages 9-10 and detect irregularities in a person's chakra flow, such as those caused by genjutsu influence.
#The user is granted incredible clarity of perception, enabling them to read lipsNaruto chapter 246, page 19 or mimic something like pencil movements.Naruto chapter 41, pages 16-17 Sasuke Uchiha's Sharingan was even able to see on a cellular level.Naruto chapter 361, page 5 In combat, this allows them to see fast-moving objects and, once fully developed, offers some amount of predictive capabilities: they can anticipate an opponent's next move based on the slightest muscle tension in their body and act accordingly to dodge or intercept.Naruto chapter 230, pages 8-10 They can also read the enemy's hand seals to give them an insight of the performed technique's nature, regardless of the speed of performance, so long as the hands are not physically hidden from view.Naruto chapter 333, pages 16-17Naruto chapter 361, page 13 Although a Sharingan user can see these things, they also need the physical ability to actually act on the visual information. In the anime, it is shown that with advanced enough prowess, via eye contact, the user can even enter the target's mind to look through their memories,Naruto: Shippūden episode 484 and even erase them within a long range for several targets.Boruto episode 136
#The user is able to copy almost any jutsu they see, memorising ninjutsu, genjutsu, and taijutsu with near-perfect accuracy. They can then either perform that jutsu or modify it to suit their needs, as when Sasuke Uchiha bases his Lion Combo on Rock Lee's Front Lotus. Again, Sharingan users need the prerequisite abilities before they can mimic a jutsu they have seen, and for that reason they cannot, for example, reproduce kekkei genkai abilities they do not have or nature transformations they haven't learned to perform.
;"Eye of Hypnotism"
#The user can perform what is generically called Genjutsu: Sharingan. While there are various manifestations and purposes of the ability, the better known one is to, through eye contact, suggest thoughts and actions to a target, coercing them to divulge information or act in a particular way, potentially without the target's awareness.Naruto chapter 26, pages 14-16 In extreme cases, the Sharingan user can take complete control of the target's body, forcing them to do exactly as the controller wishes; this control is visually indicated by the Sharingan's design appearing in the target's eye.Naruto chapter 501, page 8 The Uchiha are particularly infamous for using this ability on the tailed beasts, and in fact can enter its or a jinchūriki's subconscious to more precisely control the beast's chakra.Naruto chapter 309, page 2 Multiple targets can be taken control of in this way, though the more divided the user's attention is, the easier it is for targets to escape this control.Naruto chapter 567, page 7
#While not an ability per se, the Sharingan user can appear as if they are able to "see the future". First, the user must perfectly mimic every move their opponent makes and possibly their thoughts and words through careful observation. Then, they suggest an action to the opponent such as hand seals for a technique that the opponent and Sharingan user already know and copy that. With these things done, the user can complete the action even before the opponent does, possibly using the Sharingan's genjutsu to confuse or delay them.
In addition to these abilities, the Sharingan can also enhance the user’s combat power through channeling their strong emotions.Naruto chapter 619, page 16 These eyes also allow access to two powerful genjutsu that a Sharingan user can perform: Izanagi allows the user to warp reality for a short time, changing reality into illusion and illusion into reality, thus escaping death and rewriting destiny;Naruto chapter 497, page 9 Izanami traps the victim in an infinite loop disregarding the target's five senses, specifically designed as a reprimand for those who would abuse Izanagi.Naruto chapter 581, page 16-17 Use of either ability causes the Sharingan with which it is performed to be blinded afterwards, and for that reason the Uchiha classified them as kinjutsu.
== Transformations ==
* The Sharingan can be evolved into the Mangekyō Sharingan by experiencing the trauma of loss, granting unique, user-specific jutsu in addition to the Sharingan's standard abilities. Awakening the Mangekyō Sharingan will automatically fully mature a Sharingan if it isn't already.Naruto chapter 605, page 4
** Use of the Mangekyō Sharingan causes blindness over time, but this can be negated by transplanting another pair of Mangekyō Sharingan from a close relative, such as a sibling, to acquire "eternal" Mangekyō that never lose their sight.
* A Sharingan can become the Rinnegan, through mixing both Asura's chakra and Indra's chakra, which will bring out Hagoromo Ōtsutsuki's chakra.Naruto chapter 671, page 6 Both of Madara Uchiha's Sharingan became Rinnegan several decades after he integrated Hashirama Senju's DNA into his body.Naruto chapter 606, page 13 Sasuke Uchiha's left Sharingan became a Rinnegan after acquiring half of Hagoromo Ōtsutsuki's chakra. As shown with Madara, the awakening of the Rinnegan restores full eyesight to the eyes fixing the blindness caused from using Izanagi.
* In the anime, Hagoromo Ōtsutsuki was shown awakening his Mangekyō Sharingan and his Rinnegan, through a similar method that other wielders awaken their own Mangekyō. Hagoromo's Rinnegan was unique in that it awakened simultaneously with his Mangekyō, and skipped over it entirely in the process.
== Trivia ==
* The kanji is also used in Rinnegan and Rinne Sharingan, potentially linking the three terms etymologically.
* Kishimoto stated in the third databook that if a Sharingan user and a Byakugan user were to mate, their offspring would have one Byakugan and one Sharingan.
* From what characters have noted, this dōjutsu apparently "glows" in the dark.Naruto chapter 507, page 12Naruto chapter 602, page 1 
* In the anime, two of Sasori's hundred puppets are seen with what appear to be Sharingan.Naruto: Shippūden episode 26
* Although the Sharingan originated from Kaguya Ōtsutsuki's Rinne Sharingan, it was rumoured to be derived from the Byakugan.Naruto chapter 78, page 13
* In the novel, Itachi Shinden: Book of Bright Light, activating the Sharingan is described as dyeing the user's vision red, in addition to allowing them to see chakra.
* To safeguard the Sharingan when an Uchiha member died on the battlefield, it was common to retrieve the corpse to prevent enemies from claiming it.Itachi Shinden: Book of Dark Night, pages 53-54
* Denki Kaminarimon has developed a Lightning Release Suit containing a motion sensor that allows him to predict his opponents movements, which Sarada has compared to the Sharingan.Boruto episode 226 
* In the novel, Sakura Hiden: Thoughts of Love, Riding Upon a Spring Breeze, Kido Tsumiki planned on killing Sakura Haruno to force Sasuke into despair which would increase the power of his eyes before using them as a basis for an artificial Sharingan drug.
* The Sharingan's power was artificially replicated by other individuals with varying results:
** Orochimaru managed to recreate the Sharingan into Shijima, which was considered a failure that was unrestrainable, leading to a seal to be placed onto it. As a result, Shijima had to wear thick glasses to compensate her damaged eyesight, making her unsuitable for the battlefield. However, the eyes can still be used to paralyse anyone caught within its gaze if the seal is undone.
** Orochimaru would later perfect this by using another one of his experiments: Shin Uchiha. Using his genetic material to create several clones of him, each with their own fully matured Sharingan that could even evolve into the Mangekyō Sharingan.
** Kido Tsumiki and Magire acquired hair samples from Sasuke Uchiha at the Valley of the End, using that in an attempt to create a drug that can artificially bestow the consumers with the Sharingan. They were stopped before they could finish this unauthorised project.
** Teguse was able to create artificial Sharingan and implant them into Merz. Unlike implanted natural Sharingan, these cybernetics do not cause fatigue nor excessive chakra drain from usage, and they are able to copy even other dōjutsu that are otherwise limited to certain bloodline. Furthermore, these eyes can also attain the Mangekyō Sharingan state.
== References ==
 
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