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Kakashi Hatake is the leader of Squad 7 of the ninja village of Konoha (the Village Hidden in the Leaves). He was
Naruto's 2nd sensei (Iruka was his 1st sensei and Jiryaia was his 3rd). Kakashi is also known as the Copy Ninja because of his keen ability to witness a jutsu performed only once and copy it perfectly. He has mastered over a thousand ninja arts in this manner.
The Lightning Blade, otherwise known as Chidori, is his only original jutsu. It draws a massive amount of chakra energy into the user's palm, turning a simple jab into an electric sword wound, great for quick assassinations. It was nicknamed "Chidori" or 1,000 Birds because of the bizarre chirping sound that this jutus emits.