Kunai

Users: Many Characters

Normal Use: A Kunai (クナイ) is a black dagger about the length of (as a general unit) Naruto Uzumaki's hand. It was a common ninja tool (either used as a melee weapon or thrown) and most of the characters in the series frequently use it, with the exception of individuals such as Rock Lee or Kimimaro, although Lee did use one in his battle against Gaara.. Many ninja cleverly attack by attaching a paper bomb (a short length of paper that, when burnt, detonates) to the blade. The kunai is commonly thrown so that it lodges in an object near the target, and then the explosion from the paper bomb destroys it (the target). Kunai knives and shuriken are the two most common ninja tools in the world of Naruto.

Special Uses: After Kakashi Hatake's promotion to Jonin, Minato Namikaze gave him a special kunai with three blades. Minato Namikaze is also seen using kunai as a jutsu formula while using the Flying Thunder God Technique in the Third Great Shinobi War. They can also can also be attached to an Explosive Tag so that explosives can be thrown over a distance.

Traditional Uses: Kunai are often described as "leaf-shaped" tools. They are often wrought of iron, its only sharp section being the tip. A kunai is used for smashing and other chores that would destroy a steel-forged tool. Because of its gardening use, kunai can be used openly for gardening by a ninja without raising suspicion. Kunai are not made to be thrown, although they can inflict serious damage and are capable of being thrown.

Kunai ( as well as most other weapons ) can also be summoned by special scrolls, the most notable user of this method being Tenten for example, in her Twin Rising Dragons.