Naruto: Summoning the Eight-Headed Serpent

[No System] [Genius] [Slow Burn (The protagonist cannot control the Eight-Headed Serpent at first. As he grows stronger step by step, he eventually controls it and unifies the entire ninja world.)] Uchiha Kong, an orphan despised by the Uchiha Clan, has heard a voice repeating itself in his mind ever since he could remember. It wants him to submit and take over his body. As he grows older, the voice gets louder, like a great bell pounding inside his head, shaking his soul and tormenting his will.

“Who are you? Get out of my head! Get out!”

“Heh heh heh... I am the Evil God.”