The Kenjutsu curse. Been literally one year without getting anyone to teach me it.
Anyways...
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The way of the sword.
The kenjutsu, or as known alternatively "the way of the sword" (this sounds way cooler), is the art of using the deadly, yet fragile weapon which is the sword. This art's origin mainly lies in the early centuries of Japan, specifically the Edo Period, which was heavily samurai populated. The samurai, who is the first person to use the sword, invented this art for one purpose which is known worldwide: to kill. But is this the only use a sword consists? Obviously no.
Let's get back at it. By performing different body maneuvers, you can also give different shape attacks with the sword. In the Naruto Verse, Kenjutsu can be used in combination with chakra, which is raw chakra fueling, elemental chakra applying etc. One of the most distinct art that goes the most with Kenjutsu, is the body arts, which is known as Taijutsu. If one is skilled in Taijutsu, he may as well as excel in Kenjutsu, and vice versa I believe.
To be honest, Feitan sure fits with the sword as he is shown to use it in the series, but my other character, I don't think so. But imagination does every thing. I can picture him using a sword, perfectly.
Pff, all you need to know is Musashi Miyamoto and Sasaki Kojiro... But if you insist, mainly Kumogakure ninjas, Sasuke, Orochimaru, Madara, Hayate. That's all I know and if I may have forgotten anyone major, then let be it. I have weak Naruto memories either way.