Personality Itachi Uchiha

Since its first appearance, the figure of Itachi always shrouded in mystery, he has always been mysterious and acting like a real hide his true identity. When the flashback of his past is shown, Itachi is shown as a loving brother, but after the massacre of the Uchiha clan, it seems all the good attitude is just a pretense. But, at the end of his life, his life finally uncovered the truth also, Itachi is actually an older sister who is loving and peace-loving as the first, but during this he hid it all. During her time as a member of Akatsuki, no member of Akatsuki who know of its truth, unless Madara Uchiha.
As a member of Akatsuki, Itachi is able to control his own emotions and feelings well, and almost never show his face during the fight, his face always looks calm and "cool". However, occasionally Itachi also showed a surprised look on his face when confronted with an opponent who has the power and ability greater than she imagined, but he could still be calm. When the fight, Itachi has never shown a sense of pride or arrogance, every statement he made about the strengths have a reason, even, not infrequently he praised the abilities of his enemy.
Besides having incredible power, Itachi also have intelligence that is equally amazing. Ninja Itachi is a very smart and observant in the face of all the circumstances, he is also smart in making decisions. This is evident from the way he did not have to panic every face of his enemies. Itachi also has good intuition, he almost never be deceived by the enemy, if yes, Itachi can be quickly noticed. Although status as a Criminal At Large level S, which has been mercilessly kill his own clan, Itachi is actually a ninja who does not like violence and fighting. He prefers to avoid battle, or at least, end the battle quickly.
Itachi into Akatsuki not without cause. In addition to mastering the power of Biju, Itachi into Akatsuki so that the main objective can be accomplished. Itachi hope with his entry into the Akatsuki, Itachi can continue to protect his village, Konoha, with officials overseeing the activities of Konoha, especially Sasuke, indirectly from the outside. This is shown when he was with Kisame to search Kyūbi to Konoha. Actually, he came to Konoha not only to capture the Kyubi, but also to:
Indirectly divulge about the existence and the information to Konoha Akatsuki
Proving its goal to protect the Konoha (indirectly), and
Inform indirectly to the Principals of Konoha that he is still alive, so that the top brass of Konoha (still) can not do a no-no against Sasuke
Proving its goal to protect Sasuke (indirectly)
Because of this goal, Itachi became a member of Akatsuki who are very loyal both to the organization itself and other fellow members. Compared with the other Akatsuki members, Itachi is the most concerned with success and secrecy of the Akatsuki, so no doubt, this attitude is what has brought the Akatsuki to success. Moreover, compared with the other Akatsuki partner, spouse Itachi-Kisame was the most friendly, rarely quarrel. Kisame himself seems to have a high sense of loyalty to Itachi, he always did what Itachi told him immediately, and always pay attention to the situation Itachi. Actually, Itachi also treats other Akatsuki members as treatment Cosmos, Kisame, but it seems, good attitude is not rewarded by other members. The only members who are not unkind to him (other than Pain) is Kisame.
Although impressed by its quiet, cool and mysterious, Itachi never exhibit rude and violent while his duel with Sasuke genjutsu. At that time, Sasuke tries to get into the mind through Genjutsu Itachi. Here, Itachi said to Sasuke openly that his goal is actually to let Sasuke live is to take his eyes and gain eternal Mangekyou Sharingan. Itachi also said that the Uchiha clan is not nothing but a lowly clan, dirty, rotten and nasty, since many members of the clan who could kill his own closest friends to obtain Mangekyou Sharingan, and take the eyes of other Uchiha clan members to get the eternal power of the Mangekyou Sharingan. After this lost genjutsu Sasuke, Itachi even said himself that he who is cool, calm and cold is only a mask. Personality (the rough) is finally revealed as a mere pretense, the real Itachi does is calm, but at that time, he pretended to further strengthen the reason his brother killed himself. All he did was for love of a profound effect on his younger brother, Sasuke.
Towards the end of his life, Itachi gave all his determination to Naruto, who he regarded as the most trustworthy people to save and protect Sasuke. After listening to the answers to still protect Sasuke Naruto and also while protecting Konoha, Itachi presented him half of his strength. Itachi is very happy to hear Naruto's determination to continue to protect Sasuke, and smiled after hearing the response from Naruto. Itachi even trust him to bring Sasuke back to the light path.