A thirst for revenge
Pain is an important character in the series and in the manga Naruto Shippuden. He is an antagonist of the hero Naruto and the village of Konoha in general. He has a deep hatred and anger towards the established system of ninjas because his parents died, caught in the crossfire during a war of ninjas when they were not. Pain then decided to become a ninja himself, learning all the most powerful techniques in order to create the Atsutaki, a powerful criminal organization made up of ninjas free of laws.