Susanoo is a technique granted to those who have awakened the powers of their Mangekyou Sharingan. In the Japanese manga "Naruto," susanoo serves as the user's guardian deity in a gigantic humanoid form. It protects the user from attacks, but it also feeds on the user's chakra or life force.
The appearance, color and ability of a susanoo vary among users because it's the materialization of the user's chakra. The technique uses a large amount of chakra and strains the body and eyes of the user. In the manga, only five people are able to awaken this technique, four of whom are from the Uchiha clan while the other is a regular ninja. In Japanese mythology, Susanoo is the storm god and the younger brother of Amaterasu, the son goddess.