Chidori technique Uchiha.

The Chidori is Kakashi Hatake's first original technique, though he more frequently uses an S-ranked version known as the Lightning Cutter. He created it around the time he was promoted to jōnin, and later taught it to Sasuke Uchiha.

This technique channels a large amount of lightning chakra to the user's hand. The amount of chakra is so great that it becomes visible. The high concentration of electricity produces a sound reminiscent of many birds chirping, hence the name. Once the technique is completed, the user charges forward and thrusts the Chidori into the target. This produces heavy amounts of damage that is usually fatal. This technique is classified as an assassination technique because of the speed at which it is performed, despite the loud noise it produces. As shown against Killer B, Chidori can also be used to simply give the opponent a large electrical shock without impaling them.

Use and Improvement Originally, when Kakashi invented the Chidori, he suffered the drawback of the technique being a straight-line attack, which prompted Minato Namikaze to tell him not to use it, as the risk is too dangerous, and the technique would be rendered useless as the targets could simply evade or easily counter it. However, after acquiring the Sharingan from his friend, Obito Uchiha, Kakashi has eliminated the drawback, as he can predict the opponents' movements and aim at them much easier, making it rather difficult for the enemy to evade the attack. Sometime after mastering the Chidori, Kakashi improved it into a far more powerful version, the Lightning Cutter, which he uses more often than the Chidori itself. The Lightning Cutter is powerful enough to drive a hole through the chest of a person struck by it, as seen when Haku protected Zabuza from Kakashi. Kakashi taught Sasuke the Chidori as a means to persuade him not to use the Cursed Seal of Heaven as well as to forfeit his desires for revenge. He also emphasised that the Chidori was a blade to protect his friends. Unfortunately for Kakashi and the others, Sasuke has warped it into a blade to sever those bonds in his desire for power and vengeance. In Part II, Sasuke has mastered the principles of lightning manipulation and developed a number of other Lightning Release techniques, most of which are derived from the Chidori. Sasuke can also transmit his Chidori through weapons as he does with both his sword and with his fūma shuriken.