Hatake Kakashi

Hatake Kakashi, or "Copy Ninja Kakashi" is Sasuke's, Sakura's and Naruto's sensei. Usually discrete by nature about everything including himself, it seems that he wants to keep who he really is a secret to others and he always keeps his lower face hiddenby a mask Kakashi also has a reputation of being a severe and demanding teacher, having returned all of his previous students before Naruto and his teammates to the academy. He said that all the others were brainless kids that didn't know what teamwork is and that they only obeyed to what they were told to do, teamwork seems to be very important to Kakashi. But, even though he seems to be cold sometimes, Kakashi loves his student and care for them enough to protect them at all costs, even his life, and he demonstrated that with Orochimaru and Zabuza