The ninja in Naruto are often seen using various tools or weapons to help them in battle. The following is a list of the known weapons.
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Senbon
Users: Haku
Description: Senbon are acupuncture needles, made of either wood or metal. Haku uses them as both throwing and melee weapons. They strike a very precise target, but are often non-fatal.
Shuriken
Users: Most characters
Description: Normal shuriken are sharpened, four-pronged metal stars, useful for throwing. Though small, they can be used to distract, or, if accurate enough, could be deadly. They have an open circle in the center, used for grabbing with a finger, to avoid cutting oneself, or thread.
Kunai
Users: Most characters
Description: Kunai knives are weapons useful for melee or ranged combat. They consist of a short, diamond-shaped blade, with a handle and a ring on the end. The ring is useful for grabbing the kunai, or attaching string to it.
Katana
Users: Sasuke Uchiha, Zabuza Momochi, Kisame Hoshigaki, Suigetsu, Hayate Gekko, some others.
Description: "Katana" is the general description of any bladed weapon longer than a dagger. They vary in size, shape, and even material. Katanas, when used, often become the central focus of the ninja's jutsus, with the ninja developing techniques to maximize his sword's efficiency.
Military Rations Pellets
Users: Kiba Inuzuka, Choji Akimichi, some others.
Description: Military rations pellets were originally distributed to soldiers during the Great Ninja Wars. They boost the user's chakra, distributing it evenly to every part of the body, and in essence making it function like an animal's.
Large Shuriken
Users: Iruka Umino, Mizuki, Kotetsu, some others.
Description: Muck larger than normal shuriken, they are presumably harder to block and much more damaging.
Puppets
Users: Kankuro, Chiyo, Sasori.
Description: All puppets are different. However, they all work on the same fundamental principle. The puppeteer is a master of Kugutsu no Jutsu, and uses threads of chakra to manipulate the puppet's movements. A trend among puppeteers is to have hidden traps among their puppets, and to use poisons, smoke bombs, and other devices to incapacitate their enemy. Often, the controller of the puppet is a weak close-range fighter.
Chakra Knife
Users: Asuma Sarutobi, Shikamaru Nara
Description: The chakra knife is made of a special metal that draws the user's elemental chakra out to enhance the blade. This worked particularly well for Asuma, since his Wind element made its cutting power considerable higher. Shikamaru was also able to use the knife as a point from which he could manipulate shadows.