He hasn't as seen of 17.10.09, and I don't think he ever will.
No he doesn't if he did it hasn't been released in the manga or anime
yes pain did kill kakashi because now that naruto as mastered nature energy he is able to sense everyones chakra in the village while he was there and their was seance of kakashi chakra and kakashi was in the village their for kakashi was killed by pain! :3
No. Tobi aka Madara Uchiha is from First Hokage's generation. When they met, Kakashi didnt even know Tobi's jutsu.
no
they don't
Yes. Tobi, aka Obito Uchiha, dies while protecting Naruto and Sasuke from Kaguya. She tries to impale the pair with a bone spear attack, Obito and Kakashi move to take the hits. But to protect Kakashi too, Obito uses Kamui to make himself take both attacks. Already battered and worn beyond endurance, Obito's body begins to crumble, and he dies with a smile on his face.
The first Tobi is kakashi's best friend obito the second Tobi is the founder of the hidden leaf village Madara Uchia
No, Tobi does not kill Tsunade.
Obito Uchiha aka Tobi.
Tobi is Kakashi's old team mate and rival, Obito Uchiha, as was revealed in manga issue 599.
Obito was found by Madara Uchiha but after a while Zetsu told Obito that Kakashi and Rin were in trouble. Obito's body was weak so Tobi let Obito where his body and Obito saw weird things in his left eye and when he got there he saw Kakashi kill Rin and so Kakashi and Obito both unlocked the mankegyou sharingan.
no he did not. Tobi is actually madara uchiha.