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Itachi Uchiha (うちはイタチ)Age: 17-18 (I); 21 (II)
Birthday: June 9th (Gemini)
Height: 175 cm (I); 178 cm (II)
Weight: 57 kg (I); 58 kg (II)
Blood Type: AB
Nature Type: Fire and Water
From: Konohagakure (Leaf)
Rank: S-class Missing-Nin
Registered Ninja #: 012110
Ring: Shu (Red)
Finger Position: Right Ring
Side-kick: Hoshigaki Kisame
Favorite Foods: Rice balls (kelp), cabbage
Least Favorite Foods: Steak
Hobby: Visiting traditional Japanese cafés
First Manga Appearance: Ch. 139
First Anime Appearance: Ep. 80
Assignments Completed: 53 D-Rank, 152 C-Rank, 134 B-Rank, 0 A-Rank, 1 S-Rank
Famous Quote: Foolish little brother, if you wish to kill me, hate me, detest me, and survive in an unsightly way. Run, run and cling to life.
Itachi Uchiha is a missing-nin from Konohagakure, and a prominent member of Akatsuki, partnered with Kisame Hoshigaki. He is Sasuke Uchiha's older brother.
Itachi is relatively popular among many fans of Naruto, often having ranked in the top ten in Shonen Jump magazine's popularity polls since his introduction. He was first ranked in the third character popularity poll ranked in 11th place. He was ranked 9th place during the fourth popularity poll, and 6th place in the fifth popularity poll. During the sixth popularity poll, he again was ranked in 11th place. In the last poll, he was ranked in 5th place.
Itachi was born into the Uchiha clan and was praised by all as the best of his generation - a genius above all others. Even by the standards of the battle-adept Uchiha clan, Itachi's prowess far outshined all others. However, not even his family, friends, or teachers could understand him. When he was only 4, Itachi had already witnessed countless lives lost due to the Third Great Shinobi World War, which emotionally traumatized him and turned him into a pacifist. At age 7, he graduated from the Ninja Academy at the top of his class after only one year, mastered the Sharingan at age 8, passed the Chunin Exams at age 10, and became ANBU Captain at age 13. According to Madara Uchiha, Itachi also had a lover, whom he killed during the Uchiha clan massacre.
He was praised highly by his father, who saw the family's future in Itachi, hence neglecting his other son - Itachi's younger brother, Sasuke. However, during this time Itachi showed great affection towards his little brother, Sasuke, and even encouraged his father to come to the Academy when Sasuke was enrolled, something their dad had otherwise forgotten, by saying that he would not go to an important mission, that would establish Itachi a place in the ANBU ranks, otherwise.
As a member of Akatsuki, he possessed incredible self-control of his emotions. He constantly displayed an emotionless personality. He only showed surprise when opponents proved more powerful or skilled than he had expected, and even then he didn't lose his composure. He did not possess any arrogance, and fully justified any statements he made about his power, even complimenting his opponents at times on their abilities.
In addition to being an extremely powerful ninja, Itachi had equally impressive intelligence, and was shown to be very wise. He was exceedingly sharp and observant to any situation at hand, as he was rarely surprised or caught off guard. He also displayed great intuition, as he was almost never deceived and even then almost instantly realized the truth. Despite his status as a wanted criminal, and having murdered a significant portion of his family, Itachi took no enjoyment in violence or combat, instead preferring to avoid battle or, if this was not possible, end it as quickly as he could.
Itachi's only initial interest was in Akatsuki's goals, and his only loyalties appeared to be to the organization and its members, seeming to put the organization's success and secrecy before everything else.As such, Itachi got along with his partner, Kisame, much better than most other Akatsuki members did with their own partners. Kisame appeared to have a deep loyalty to Itachi, immediately doing as he instructed and constantly looking out for his well-being. Itachi treated all of his fellow Akatsuki members to this same, more respectful personality, although his courtesy was rarely returned by the other members.
Despite his status as an infamous shinobi, his appearance was not the most intimidating, apart from the intensity of his eyes. While living in Konoha, he would regularly have a gentle and caring look in his eyes, especially directed towards his younger brother. After joining Akatsuki, he would regularly have a stern look to them. He was a fairly tall shinobi, whose basic appearance was very much like the rest of his clan.
He, like all members of his clan, possessed dark grey eyes, and also had black hair that hung near his cheeks to frame his face. He also had the addition of a long ponytail in the back of his hair (which he obscured with his Akatsuki cloak after joining the organization). Being brothers, Itachi and Sasuke had a similar appearance, but with subtle differences. Itachi's hair color appeared slightly duller and with a softer flow to it, without the spiky style at the back. His skin was also slightly darker. Itachi's most distinguishing characteristics were the long pronounced creases under his eyes.
When he lived in Konoha, his casual clothes would consist of a black shirt with a large Uchiha clan symbol on the back of it, and black pants with a weapons pouch strapped to them. When on duty, he would wear the traditional ANBU uniform, although he was never shown wearing a mask. As a member of Akatsuki, he wore the traditional Akatsuki cloak, and usually kept the center of it buttoned down. After his cloak was incinerated by Sasuke's Kirin during their fight in Part II, it was revealed that he still wore his casual clothes underneath it. Like almost all members of Akatsuki, he wore the headband of his home village, Konoha, with a line gouged through it, to symbolize his broken ties with the village
Since a young age, Itachi's intellect and talent showed their brilliance in everything he did, as even his teachers said his progress hardly required any help. In the few battles he had been seen in since the start of the series, Itachi was shown to be an incredibly powerful ninja, and easily one of the strongest in the Naruto series, as demonstrated by his ability to easily defeat Deidara, Sasuke, Kakashi Hatake, Kurenai Yuhi and Orochimaru (twice), who themselves are considered amongst the strongest ninjas in Naruto. Being a pacifist, Itachi did not actively take part in battle, typically only acting in self-defense.
Being of the Uchiha Clan, and as noted by Kakashi, Itachi was a true successor of the Sharingan Eye. From a stationary position, he would study an opponent's movements with his Sharingan and respond accordingly, often with a genjutsu. He could cast a genjutsu by merely pointing at or looking at someone, and could similarly turn an opponent's genjutsu against them with Demonic Illusion: Mirror Heaven and Earth Change. Itachi had trained so much with his eyes that he had reached the stage where he could have his Sharingan activated the entire time, with minimal drain on his chakra levels.
Itachi possessed the Mangekyo Sharingan, which increased his already great power, and enabled him to use his most powerful techniques. With his left eye, he could use Tsukuyomi, a genjutsu that traps an opponent's mind in an illusionary world, torturing them for what seems like days in a matter of seconds.With his right eye he could use Amaterasu, a ninjutsu which allowed him to create a black flame that he could direct by moving his eye to burn through seemingly anything in its path, including fire itself. His final technique was Susanoo, a technique that manifested itself as a spectral being, labelled as the "Raging God of Battle" in the databook. It wielded the Totsuka Sword, an ethereal sword with the ability to seal anything it pierces into the gourd that serves as its hilt, and Yata's Mirror, a shield that can reflect any attack. Zetsu, a fellow Akatsuki member, stated that Itachi's mastery of the Sharingan, combined with the legendary weapons of Susanoo, made him invincible.
(Sources: Naruto.com and Naruto.wikia.com )