Naruto's Second Element
In the Anime, and Manga when Naruto fights Gaara, then Shukaku comes out right?
Shukaku's element was Wind, because he used Wind Release: Drilling Air Bullet.
Although It has been yet to be shown, the 9-tailed foxes element may very well be fire, Leading up to be Naruto's second element?
If that is his second element also, it would be unnatural in a way of sense. The fire element comes from the 9-tailed fox. Naruto may end up having 3 elements.
The paper Kakashi gave him split in half, meaning that his element was wind.
Also, when Naruto tried to learn Chidori from Kakashi, Kakashi told him that he wasn't the right type for the move.
This means Naruto's second element can't be lightning.
This leaves the Water, Earth, and Fire element.
I am almost positve Naruto's 2nd element is Fire, and if he has a 3rd element either Water, or Earth
That leaves us