Itcahi would of never gained the mongekyo sharingan because as you may know his original plan was to place all his powers into Sasuke, and give his own eyes to Sasuke.
But i imagine if he gained the eternal mongekyo sharingan he would have some of sasuke's powers and he would be able to see the light clearly.
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We can't be sure if Tobi has it, but he said that he had "the sharingan's true power". He could have been talking about the mangekyou sharingan.PossibleTobi is MadaraIt all depends weather or not Tobi is Madera (i think he is) then he does have the Mangekyo sharingon, but if your one orf the "Tobito" belivers then he probably doesnt have it.Tobi is Uchiha Madara and Madara was one of the first to obtain Mangekyo Sharingan...TRUTHTobi actually is not Madara, Madara is brought back to life in one of the newer episodes and fights for the Akatsuki. This proves that Tobi is an imposter.
In short: born into the Uchiha clan, became friends with Itachi Uchiha, gained the Sharingan and Mangekyo Sharingan, was assign to spy on Itachi by the clan when they where planing a coup and Itachi was acting strange, tried to stop the coup and got one of his eyes stolen by Danzo, gave his other eye to Itachi and killed himself.
The new sharingan Sasuke received after defeating Itachi has the ability to use Susanoo an ability that resembles yamabushi or mountain hermits with a destructive power. The new sharingan he gained also granted him a technique called amerterasu which allows him to control a kind of black fire that has the ability to burn a human to the bone. He can also use Itachi's famous Tsukuyomi which is the ability that was used on Kakashi in episode 82 of the first series. The first two abilities made a debut when used by Itachi in shippuden 138.
Naruto can't have Sharingan because 1. He's not an from the Uchiha clan he is from the Uzumaki clan and 2. If Itachi were to give Naruto Sharingan Itachi must die and Itachi doesn't die until Sasuke kills him in Naruto Shippuden. So in final Naruto doesn't have Sharingan.
Sasuke is shown using his eternal mangekyou sharingaan in manga chapter #574. In this chapter he uses his new Susanoo to obliterate a small platoon of white zetsu within seconds. It is also described he was now able to see the darkness in souls of his enemy.