Omg guuuyyyzzzzz!!! Tobi is obito!!!!
Holy shiT, peoplesss, like, Tobi is TOTALLY Obito!!!

They haev the same hairstyle, and Tobi wears an orange mask that only shows one eye. OBIT'S FAVORIE COLOR WAS ORANGE!!


THEN IF YOU SWITCH TOBI AROUND, IT TURNS INTO OBITO!!! AND VICE VERSA!!!! LIKE ZOMG ZOMG ZOMG!!!! LIKE OH MY GO, GUYS!!!! IT"S LIKE, NOOOO COWINCIDENCEE!!!!! OOOHH!!!! Lkike omgggg!!!!
Okay, enough of that. THAT above^ is what people usually expect when they see a Tobi = Obito thread, so I'm going to give actually GOOD evidence that the masked man Tobi may in fact be, Uchiha Obito.
Firstly, the big "Tobi Reveal" is only exciting and climactic, if the readers AND the characters in the manga, recognize the man behind the mask. This will create a huge amount of shock value and will come to wonder how Uchiha Obito came to be Tobi. Since Tobi's identity has been hidden so long, it makes sense that we should be shocked by whoever it is. Plus, we, the audience, and the characters in the manga, should recognize him. This will create emotional trauma in the characters. Now at this point I guess you'll will be saying, "Well, Naruto won't recognize Obito!" True, however, there are no logical candidates to be Tobi that Naruto would recognize anyway, so that argument is invalid. Plus, I think it would work better if Naruto doesn't recognize Tobi's true identity, because this symbolizes Tobi and Naruto's clashing ideals, not whether Naruto recognizes him or not. As for who will recognize him, Kakashi, obviously, Lol.
Since Obito was originally an exact parallel to Naruto, an evil Obito would therefore make the best final villain(besides Sasuke)for Naruto. Plus, what would be the shock of it being someone we don't instantly recognize? I mean, if it IS Obito, recognition should be easy as half his face should be crushed and half should be fine.
A common argument against the Obito theory is "Why would Obito turn evil? He was good!" Well, my answer to that is, of course we don't know WHY he is doing this. If we did, that would be a give away of him being Tobi. His motivation will likely be revealed AFTER the reveal of him being Tobi.
Another thing: go to Naruto chapter 515 and go to page 3. it is a color page with the Konoha Eleven in war uniforms. Looking above Naruto is an enlarged picture of Tobi's head/mask. If you look carefully through the eyeholes, you will see that under the right side of his face(the side with his sharingan) there are wrinkles/scars and on the other side, no such wrinkles/scars are visible. Now why would Kishi show that deep into one of his mask holes, and not the other?
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Something else that's suspicious is that Kishi has never explained how Rin died or how Kakashi got his mangekyo, when he could have easily have had Kakashi explain how he got mangekyo when he first got it and tell how Rin died in the databook. We are missing a major flashback! And we will most likely get it eventually, but it has to occur at a time that makes sense and has something to do with what's happening around it. Tobi being Obito, would make the most sense to be what triggers this flashback.
And, in regards to Tobi's mask I find it strange how he picked orange of all colors, especially since very few characters in this manga wear orange. You'd think he would choose a more threatening color. It seems more like a personal preference if you ask me.
Here's one more thing. You know how Kishi very often incorporates Japanese mythology into his writing, right? Well, here's a cool little piece of information that I found on a site:
"--------------Mythology in Japan-----------------
First I'll present an overview of what some of you may know, as we will need it for further investigation, il'll keep it short, so bear with me:
Notes on Izanagi: As you know, the God(Kami) Izanagi created the three gods Amaterasu(Sun God), Susanoo(Fighting God) and Tsukoyomi (Moon God) by wiping dirt from his eye's and nose, which he got when traveling in the underworld yomi and witnessing its horror (Lost his wife).
Manga relevance: Izanagi created those three gods while experiencing something terrible, which correlates to Mangekyo sharingan activating when experiencing something horrible.
With MS you will then be able to use these three abilities.
Rinnegan: Rinnegan obviously comes from the term Rinne, which revolves the 6 forms of death and rebirth, the worlds constant struggle continues struggling with no escape but one: Enlightment!
You may only escape this terrifying struggle by finally understanding the world and all 6 paths, you will finally find absolute peace.
Which is called Nehan. So will we see some Nehan action in in the ending for this manga? Maybe.
Notes on Kamui: Kakashi has shown no ability to use these three techniques, but the ability Kamui, which relates to the term "god" itself.
Why? Possible answers are that he isn't an Uchiha or because he didn't get MS through horrible means, or something else entirely.
Notes on Tobi:He has not shown the ability to use Amaterasu and Co. Which means he hasn't got MS, but then how is he gonna accomplish the Moon's Eye Plan without Tsukuyomi? His reason for Sasuke?
Or does he have MS, but only the ability Kamui like Kakashi? Why? Is he not an Uchiha either or is there perhaps another reason?
Why do i tell you this? Because by examining old myths and symbols, we might predict the outcome of the manga or identities.
Did you know of the myth of the 8 headed snake Orochi that got killed by Susanoo? Or the myth of Jiraiya the toad hermit that was in love with Tsunade the slug princess?etc.
Now the interesting part:
In japanese prehistory there are a lot of myths and symbols, and i present one in particular.
Symbol behind one open, one closed eye:
Ancient figures are often depicted with a right eye open and a left one closed, it means "change", light and darkness, as the open eye means full moon and the closed eye means new moon.
The lunar cycle was the only long term means of observing time.So characters that have one eye symbolize change and time, darkness and light.
(Remember Kamui, space/time jutsu)
There are several Japanese figures with two faces pointing away from each other, one side depicting a right eye open, a left wounded eye with a diagonal cut, sometimes crying.
The other face either has no real face depicted with eyes at all, or simply a close left eye.
These one open, one closed eye figures all show spirals on the sides of their heads or on other body parts.
Now, i don't think i must point out the resemblance to Kakashi and his left vertical wounded eye, and to Tobi's spiral mask.
Tobi originally only showed one eye, of course this was intended symbolism of the Moon and in my opinion, the "change" in Obito. What was very interesting, was Tobi using Izanagi with his left eye, closing it forever.
Also the fact that they both show Space/time abilities, while both having one eye showing, is an amazing coincidence.
When remembering the MS ability Kamui, they might indeed share another plain of MS power than Madara, Itachi and Sasuke. A form of special MS, only achieved through shared grieve and by sharing the sharingan. Not by killing your best friend, but by something else.
Source:
----
Japanese prehistory: The material and spiritual culture of the Jomon period.
written by Nelly Naumann."
Now, here some more stuff that proves that Obito is probably the most logical and dramatic choice for Tobi:
Back in part 1, itachi told sasuke in a flashback that there was a third Sharingan user. Now, we all now that he was talking about Tobi, which means that Kishi would have had Tobi's identity set from the start. Now, who was already created by Kishi at that time, who is a plausible Tobi candidate? Obito. If Tobi is Kagami or one of those sons or anyone introduced way after him, then Kishi would have talked about them more. Obviously Kishi had to have Obito in his mind since we already knew kakashi had his sharingan. I think that Kishi intended Obito to be the main villain from the beginning. If it were someone like Kagami or the sons or something, why not mention them sooner or talk about them more often.
There's got to be a reason that gaiden and Tobi's first apearance are seperated by the Gaara rescue arc. And tobi and obito are both shown to be clumsy in their first apearances. Also, who the hell else besides Obito would be able to pull off a silly act like that? All these people can't explain why Tobi's space-time only comes from his right eye. And why his mask is suspiciously the same color as Tobi's mask, insisting a similar color preference.
Also, Tobi wore his akatsuki ring on his left hand, while obito held his Kunai with his left hand, this could mean that they're both lefties.
When kakashi was dying after his battle with pain, he was remembering Obito and thinking how he broke his promise and couldn't save Rin. This could be part of obito's motive. it could also be why kakashi said everyone close to him was dead. it's because Obito keeps killing them all to get revenge for him not protecting Rin. Combined with his hatred for war and being crushed by a huge boulder, I could see Madara being able to corrupt him and make him turn evil. Also, remember that sharingan glare he gave Kakashi? these things are called foreshadowing. Authors use it all the time.
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And, here's another example of foreshadowing:
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Why would kakashi randomly mention that he broke his promise to protect Rin? Kishi had to be hinting at something.
And we've already seen bits of the left side of his face in these panels and it doesn't apear to have any wrinkles/scars:
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In the first one of those links, why would Kishi draw those wrinkles/scars on one side but not the left?Maybe he was hinting at something?
Plus, Kishi can be very obvious sometimes, like how minato was obiously Naruto's dad. So, the same might hold the same for Tobi being obito.
Obito also fits the best thematically. For example: a running theme in this manga is for students to surpass their mentors. Thematically, it would make sense if Obito surpassed his. At least in terms of Space-time ninjutsu. Here are some examples of when Tobi's space-time ninjutsu was stated to be greater than Minato's:
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And also, Obito was an exact paralel to Naruto. He had naruto's color scheme of orange and blue except reversed. Now, why would kishi make Obito so like naruto? Because an evil Obito would make a great antagonist and anti-theses to Naruto. think about it.
So, there's my take on Tobi being Obito. Hope you enjoyed.
I am grateful if you managed to read all this. (After all, if you can't read a group of paragraphs, God only knows how you'll read a simple chapter book

)