Tobi (Obito Uchiha)

Madara Uchiha is an extremely powerful ninja shrouded in mysteries who serves as the primary antagonist in the Naruto franchise. Madara was once the leader of the famed Uchiha clan and the co-funder of Konohagakure, the Hidden Village of the Leaf, but his bellicist view and his hatred of Harashima Senju, the First Hokage, estranged him from his own clan and he deserted the village, which he swore to destroy. Madara resolved to gather the nine Tailed Demons and use them to cover the entire world with a Tsukuyomi genjustsu to control it as a God. Despite appearing very late in the story and first being seen under a fake persona, Madara is the funder and actual leader of Akatsuki and is more or less directly responsible for the attack of the Kyubi and the Massacre of the Uchiha Clan, as well as many other horrible events all over the ninja world, which he manipulated from the shadows.