itachi says that he hopes that naruto may not have to use the power given, supposingly itachi had pridicted that naruto would have to face sasuke. also itachi knew that naruto would stand in the way of sasuke if he were to be out of hand and on the wrong side. itachi also says the power is a 'IT'. it oculd some sort of repelling of genjustu or amaterasu and susanoo. OR it could be a tool to control the kyubi's chakra, as the sharingan abilities have shown power to control the tailed beast. the power could possibly be unlocked at a certain time when naruto is at his last stand to protect the vilage from the vengance of sasuke.
The power that itachi give to naruto The Blade of Totsuka ...... that's why sasuke got all of the Susanoo but never got The Blade of Totsuka how about that :P
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I know exactly what itachi gave naruto and if you recall a crow entered naruto, well that crow had the eye of shisui inserted in it( for those who don't know shisui type is name on wiki) now this crow contains a power genjutsu allowing it to protect the konoha village and can control anyone without them knowing, ofcourse shisui was killed by itachi but they were like brothers and shisui gave itachi is air so that he could protect the village with it and thats the thinking being itachi's actions of giving it to naruto because he's the only on that can protect Konoha !
He handed it out before he died
It is unknown which powers Itachi gave Naruto. It might be revealed soon as the long-awaited battle Naruto vs Sasuke is about to begin. what itachi gives naruto is uchiha shisui 's eye. shishui 's eye is very powerfull and it can control a person without him knowing he is being controlled. he was a gifted uchiha.danzo has his right eye and naruto his left. itachi puts acrow inside naruto,that crow has the sharingan of shisui. that crow will come out if someone activate amaterasu or tskuyomi which itachi feels will save naruto from sasuke's sharingan 's power. That power is called koto amatsukami.
It was more chakra for him to use in the future.
It's not sure exactly what power Itachi gave Naruto. All that is known is that Itachi gave Naruto some of his power. You can go to episode 126 and also watch it but in that episode they cut the part where Itachi gives Naruto some of his power. You may have to check the Manga.
Although it is commonly speculated by fans to be the Sharingan eye, this is not fact as there has been no idication as to what the power Uchiha Itachi gave Naruto is in the manga to date. What he meant by "I hope you never have to use it," is that Sasuke would never attack Konohagakure -- Itachi asked Naruto what he (Naruto) would do if Sasuke attacked Konoha, to which Naruto replied he would stop Sasuke without killing him. Itachi gave Naruto the power so he would be able to this, or at least have a better chance at being able to.