I just saw this thread about Naruto using a weapon and what type of weapon it would be.
And it got me to thinking, Considering Naruto's fighting style, His Weapon besides the basis would be Brass Knuckles.
IMO it fits him perfectly. He always punching people in his combos, and brass knuckles would just do that more damage.
Also maybe have a small blade on the edge so he can throw and with his wind ability.