As of the latest chapter, he didn't.
Wait and see
Not till now. We'll have to wait and see.
no one not even sasuke or naruto. hes immortal
Naruto has not killed Madara yet.
We'll have to wait and see. Madara hasn't shown his power. He only dodged with space time jutsu last time they met.
Naruto, obviously.
Not yet no. Not Tobi or Madara.
No. Tobi is actually Madara Uchiha is disguise. And at this point he is still alive and is the leader of Akatsuki
Well actually there is no episodes that shows naruto and madara fight each other yet.
tobi is uchiha madara
YES!that is why naruto is training to use the 9tail foxes demonic power to defeat Madara
This happened in Naruto Shippuden Chapter 678, Black Zetsu Betrays Madara.