Most of the people think that Tobi is Obito, I have seen many theories from the A to Z, but main reasons for which people says that Tobi is Obito is first for Tobi's name and how is read backwards, edit: dammz good eye just destroyed this theory because Obito backwards is Otibo.
Edit 2: Chimie (translator) explained that in japanese the obito/tobi backwards theory works. read his post: http://www.mangashare.com/forums/sho...7&postcount=43
In the last three chapters we have seen many theories to flop in the dirt, some like Akatsuki leader (by then Pein), was actually Arashi Kazame (Yondaime Hokage).
Not matter how we look at it, each member of Akatsuki have a personal reason behind his desire of being a member of that organization, but why someone like Obito would like to create or be part of an organization like Akatsuki. Why someone who strongly belives that those who break rules are called trash, but those who abandon a companion are worse than thrash, would like to be part of something like Akatsuki which sooner or later is going to attack the big five remaining nations in order to have control of war market?.
Ok, I know that is simple to say Obito is Tobi because he has a hole in the eye were Obito is supposed to have an eye. I noticed something today, Kishimoto is forcing to think in that way, forcing us to assume something just because is logical to assume it and then he comes and surprise us with something that was out of our imagination but which fit perfectly in the serie. Basically he wants to put limits to our imagination, that's what I believe.
There's not way in which Obito could be a traitor or someone like Tobi at all. There was a solid theory about Obito being mind controlled by then Akatsuki Leader "Pein", but since we know that he is Sharingan User and also acts like the leader of Akatsuki is hard to believe or think in that theory seriously. Obito strongly believed in the white fang as a hero and he is who actually told Kakashi that those who abandon a companion are worse than trash [Picture/Image].
So even if Tobi is Obito someone who believed in what he said strong enough to say that he'll crush that idea of shinobi, is someone who would never abandon a companion. Why he abandoned Deidara then?, simple he is not Obito.
Ok Alterno i'll believe your theory, but then who the hell is behind Tobi's mask?.
If he is an Uchiha, he just could be two persons.
The first one that come to my mind is Uchiha Madara, it just would explain a lot of things like:
The Second person that come to my mind is Shisui Uchiha, his name means still Water. he was considered by that time the a master of the Body Flicker Technique, meaning that he could move so fast that it would look like if he were teleporting himself from a point to another. He was found drowned in the river from what appeared to be suicide though the Konoha Military Police believed it to be murder. We know that there are some medical-nin with the ability to change bodies, just like Kabuto did when he was in the hospital and while yamato was tracking him.
- Uchiha Madara being Tobi, would explain why Kazuzu was a member of Akatsuki, the reason is because they both fought against Shodai Hokage.
- It would explain why they didn't told Itachi the true about Sasuke, he is looking for container, since his body should be rotting already.
- It would explain his Sharingan.
How can someone considered as one of the most talented shinobi in the Uchiha clan, be killed that easy?, just two thing come to my mind.
I can't really go deep in this theory, but far as I know only Sasuke's family had access to the secrets of the Uchiha clan or were something like the keepers of the secret, in fact that some secrets were hidden at Sasuke's house, there's a chapter/episode where Itachi tell Sasuke to search for a scroll at his house. So he has a motive, obtain information about the sharingan, information to which only a few in the clan had access. Another thing that makes me think about Tobi being Suishui Uchiha, is the page 19 of the chapter 364, is where he jumps leaving a small track behind, just like the body flicker technique.
- Itachi abilities including his Sharigan are something god like, even against the most talented people of his clan.
- Shisui didn't die, he used someone else's body and made it look like his body, killed.
Is really hard to tell which of those two is Tobi, but I'm sure about something... Tobi is not Obito.