Top Definition
Uchiha Itachi is one of the main villains in the hit anime/manga series, Naruto. Currently a member of the Akatsuki organization, he seeks to unlock the true potential in his younger brother, Sasuke Uchiha. Itachi, being the prodigy of the Uchiha clan, killed all of the members of his clan, aside from his younger brother Sasuke. When asked why he destroyed his clan, he simply answered, "To gauge my strength", or something to that element. He tells his younger brother that the Mangekyo Sharingan that he possesses is not merely a kekkai genkai, but it has a secret ultimate purpose that has yet to be revealed.

The Uchiha clan specializes in Katon (fire) Jutsu techniques. The power of said techniques can be heightened with the use of the Sharigan. The Uchiha clans kekkai genkai. (blood line limit) Another, more powerful form of the Sharingan is the Mangekyo Sharingan, possessing the ability to cast genjutsu instantly without flaw. One of the techniques that Itachi favors is Tsukyomi (Moon Reader). This genjutsu technique can submerge the victim into a limitless world that Itachi has complete control over. He can distort gravity, time, existence, and creation in this world. It's absolutely impossible to dispel.

Itachi told his younger brother Sasuke that, if he was to obtain the Mangekyo Sharingan, there would be three people capable of using it. This implies that Kakashi is capable of obtaining the Mangekyo Sharingan.
Uchiha Itachi: "If you are to obtain the Mangekyo Sharingan, there will be only 3 people on this earth capable of using it."
by Wesley Fisher June 13, 2007
A fictional character from the popular manga and anime, Naruto. Itachi has two things his brother will never have: a nearly unreachable level of power and good looks (I'm sorry, Sasuke fans). The prodigy is skilled in many ninjustsu, genjutsu, and taijutsu. His most well known is his Tsukyomi (one of the two main techniques that come with the Mangekyou Sharingan), which is ultimate torture in the form of either bad memories or 72 hours of a pain of Itachi's choosing.

Itachi's name means weasel. In Japanese culture, weasels are said to be a bad omen.

The Uchiha had a thirst for power, reflected by the fact that he was willing to kill his own best friend, Uchiha Shisui. It was believed for a time that Itachi had murdered the rest of his clan (with the exception of Sasuke) because he is a sadistic bastard and never cared about anyone but himself. However, before his death (which was caused by his own power lust, ironically), we find out that he had been ordered to kill his family and he had only managed to have Sasuke spared because he threatened to go public with the plan to kill the Uchihas. It was also thought that Itachi murdered everyone on his own, but he did recieve a hand from Uchiha Madara.

In Naruto Abridged (a parody of the anime), the relationship between Sasuke and his brother is turned comedic. The duck butt-haired ninja says he hates Itachi because "he took the last Klondike bar."

Itachi is among the most popular characters from Naruto, due to his strength and good looks. He appears in many fanfictions, frequently OOC. However, when he is shown as his normal stoic self in such stories, it is often because he had a troubled past, and he easily steals the spotlight of the tale.
Jashin, that last chapter of "My Weasel" was stupid! Uchiha Itachi was really OOC. xItachixFanxPersonx writes even worse than Stephanie Meyer!
by TheRoyalCourtJester(ofyaoi) March 24, 2009

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