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===Sharingan===
[[File:SharinganSasuke.jpg|thumb|[[Sasuke Uchiha]] using the Sharingan]]
The {{nihongo|Sharingan|写輪眼||lit. "Copy Wheel Eye", English manga: "Mirror Wheel Eye"}} is a [[#Kekkei genkai|genetic]] eye technique that naturally occurs in members of the Uchiha clan. It is not immediately present from birth, and first activates in a stressful situation in battle; after this occurrence, the user may utilize the Sharingan freely.<ref>{{cite book|author=Kishimoto, Masashi|title=Naruto, Volume 3|year=2004|publisher=Viz Media|chapter=Chapter 27|isbn=1-59116-187-8}}</ref> When first acquired, the Sharingan has only one [[tomoe]], and as its power increases, two additional tomoe will eventually appear. [[Kakashi Hatake]] possesses a single, transplanted Sharingan in his left eye that he received from his teammate, Obito Uchiha.<ref name="c243">{{cite book|author=Kishimoto, Masashi|title=Naruto, Volume 27|year=2007|publisher=Viz Media|chapter=Chapter 243|isbn=1-4215-1863-5}}</ref> Because he is not a member of the Uchiha clan, Kakashi's Sharingan is always active and he expends chakra rapidly when using it, forcing him to rest after long battles.<ref>{{cite book|last=Kishimoto|first=Masashi|title=Naruto, Volume 16|year=2007|publisher=Viz Media|chapter=Chapter 142|isbn=1-4215-1090-1}}</ref> Members of the Uchiha clan expend a negligible amount of chakra when using the Sharingan; Akatsuki member [[List of Naruto antagonists#Itachi Uchiha|Itachi Uchiha]] keeps his Sharingan activated constantly.
Over the course of its development, the Sharingan will grant the user three unique abilities. It is most famous in the ''Naruto'' world for its ability to memorize and replicate any jutsu it has seen, allowing the user to use an opponent's jutsu against them.<ref>{{cite book|last=Kishimoto|first=Masashi|title=Naruto, Volume 2|year=2003|publisher=Viz Media|chapter=Chapter 12|isbn=1-59116-178-9}}</ref> The Sharingan's second ability grants the user increased clarity of perception, allowing them to track and predict the movements and actions of fast-moving objects. This also allows the user to easily recognize [[#Genjutsu|genjutsu]] and different forms of chakra.<ref name="c243"/> Its final ability is a brand of hypnosis that suggests actions and thoughts to the opponent, acting as an effective way to produce genjutsu or implant memories in another person.<ref>{{cite book|author=Kishimoto, Masashi|title=Naruto, Volume 17|year=2007|publisher=Viz Media|chapter=Chapter 147|isbn=1-4215-1652-7}}</ref>
====Mangekyo Sharingan====
The {{nihongo|Mangekyo Sharingan|万華鏡写輪眼|Mangekyō Sharingan|lit. "[[Kaleidoscope]] Copy Wheel Eye"}} is a heightened form of Sharingan introduced towards the end of Part I. At that time, the Mangekyo Sharingan is explained to be rare among the members of the Uchiha clan, present only in those who have killed their closest friends.<ref>{{cite book|author=Kishimoto, Masashi|title=Naruto, Volume 25|year=2007|publisher=Viz Media|chapter=Chapter 225|isbn=1-4215-1861-9}}</ref> In Part II, this is revealed to be false; after [[List of Naruto antagonists#Madara Uchiha|Madara Uchiha]] became the first to awaken his Mangekyo Sharingan, it became common practice for Uchiha to kill their friends to gain their own.<ref name="c386">{{cite book|author=Kishimoto, Masashi|title=Naruto, Volume 42|year=2008|publisher=Shueisha|chapter=Chapter 386|isbn=4-08-874512-1}}</ref> It is also revealed that the Mangekyo Sharingan does not need to be gained by killing a friend, instead activating after the death of anyone the user is close to. [[Sasuke Uchiha]] gains his own Mangekyo Sharingan when his brother, Itachi Uchiha, dies of natural causes.<ref>{{cite book|author=Kishimoto, Masashi|title=Naruto, Volume 43|year=2008|publisher=Shueisha|chapter=Chapter 401|isbn=4-08-874552-7}}</ref> Under which circumstances [[Kakashi Hatake]] gained his Mangekyo Sharingan has yet to be revealed.
Unlike the regular Sharingan, which appears identical from user to user, the Mangekyo Sharingan's [[tomoe]] seal differs between individuals. Similarly, each Mangekyo Sharingan grants the user different abilities. Itachi Uchiha can use his Mangekyo Sharingan to induce extremely potent illusions that can kill his targets, and form black flames as hot as the sun. Kakashi Hatake has used none of Itachi's Mangekyo Sharingan abilities, and is capable of warping objects into other dimensions.<ref>{{cite book|author=Kishimoto, Masashi|title=Naruto Character Official Data Book Hiden Sha no Sho|year=2008|publisher=Shueisha|isbn=978-4-08-874247-2|pages=194-195}}</ref> One feature shared by all Mangekyo Sharingan, however, is the ability to control the [[List of Naruto characters#Nine-tailed demon fox|nine-tailed demon fox]]. Once the Mangekyo Sharingan has been gained the user suffers from ever-deteriorating eyesight, a process that is aggravated by repeated use and culminates in blindness.<ref>{{cite book|author=Kishimoto, Masashi|title=Naruto, Volume 42|year=2008|publisher=Shueisha|chapter=Chapter 385|isbn=4-08-874512-1}}</ref> One's eyesight can be permanently restored by taking the eyes of a sibling who has the Mangekyo Sharingan, a process that combines their two Mangekyo Sharingan into one "eternal" form with increased power.<ref name="c386"/>
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