no
Tobi because nobody could defeat him. But i think if naruto fight Tobi Tobi will get kill
Naruto wants to fight Tobi, and A fears that Tobi will extract the fox from Naruto and use it to take over the world
they don't
in the manga chapter 503 or 504 the fourth hokage fight s Tobi and hits him because when Tobi attacks your able to hit him.
no he doesnt. not yet i dont think
The Akatsuki more specifically Deidara and Tobi
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".
Tobi, hands down. He knows how to summon the 9 tails. Sasuke can't do anything but bleed his eyes out trying to make his eyes change shape.
Seams unlikely, due to the fight between Tobi and Madara against Naruto & co.
it starts at episode 81 but im not really sure
I am positive it is Tobi