Hatake Kakashi, also known as 'the Copy Ninja Sharingan Kakashi', he is a Jounin assigned to look after and train Sakura, Sasuke, and Naruto. Kakashi has memorized over 1000 Jutsus (probably more), all of which are very impressive. He learnt them through a special eye technique which can copy Jutsus called the Sharingan - also known as the 'copy wheel eye'. However, because he is not a member of the Uchiha clan, it seems to have been attached in an operation - there is a scar over it, and normally the Sharingan effects both eyes, not just one. Kakashi is a very powerful Ninja, one not to be underestimated. He is known around the world for his incredible powers. He is rivals with Gai, a fellow Jounin in the Leaf village. They have fought almost 100 times, 50 wins and 49 losses. Gai claims to be stronger but we'll have to see about that...