Tobi IS Uchiha Madara. It is revealed sometime after Sasuke kills Orochimaru.
It can't be Madara because in recent manga chapters Madara has been revealed to be kabuto's secret weapon among the people he resurrected using his impure resurrection technique. I'm guessing it's Obito now.
Tobi is not anyone from the Uchiha clan. Tobi is not even a user of Fire Release. The AFFINITY of all Uchiha clan members is Fire Release. Tobi uses only Earth Release.
It is Madara Uchiha, the person that would be the first hokage, but he loses his battle and the honor of the Uchiha. (Orochimaru has got his body, so he takes the body of Obito, the uncle of Sasuke, that gives his sharingan to Kakashi) Obito's face is deformed so he takes a mask.
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Tobi , from Naruto , is voiced by Joshua Seth .
Madara's debut appearance as Tobi is Naruto Shippuden Episode 32: Return of the Kazekage.
I'm not sure of when Naruto fights Tobi alone, but there is an episode in Shippuden in which he fights Tobi with a group of six or so shinobi whilst on a quest for Sasuke. This episode is number 134, called "Banquet Invitation".
I would say definitly no because Tobi is invincible not even naruto can beat him he is also immortal that he is madara uchiha he may not look it but madara cut his hair and used transformation jutsu he is too strong and the last time naruto messed with Tobi naruto got a face full of tree.
Yes it is true that Obito Uchiha is tobi as shown in Manga Chapter 599