Haku

Haku is a ninja from the land of water. He has the ability to control two types of nature chakra (most can only control one), they are water and wind chakra. This gives him the ability to use ice chakra which is a mixture of the two. The land of water was suffering from war, ninja like Haku were hated. This caused Haku's father to kill his mother, but before he could kill Haku, Haku killed him. After that Haku met Zabuza, seeing the potential Zabuza began training Haku as a weapon. Kakashi later kills Haku when he was trying to kill Zabuza.