He's the main character.
Naruto has no seasons, only part 1 (pre-Shippuuden) and part 2 (Shippuuden).
I don't know if the serise will end after season 9, but I do know that there is another serise following after naruto shippuden that is a time skip of 5 years. (Spoiler) I read online that Naruto does become hokage.
In fact, naruto shippuden is the continued season of naruto in japan
If you're talking about 'Naruto' then its season 4. If you're talking about 'Naruto Shippuden' its season 5.
I suggest you watch it online in english sub because i believe they have stopped making the english dubs for right now but here are some great websites: subs and dubs from animefreak.tv or narutoget.com
It happens in the first season of naruto shippuden
Naruto faces off with Sauske in season 5 through a bit of season 6. Episode 128-134
If you mean season, then yes.
Season 10
it has released
Naruto episode 453 isn't out yet.
Episode 135 Naruto 1st Season