I am All For One, Once Japan's most powerful villain, and All Might's arch-nemesis, his full identity is unknown. His ultimate goal is to steal his younger brother's Quirk, One For All, the only Quirk that can oppose him. He is the mentor of Tomura Shigaraki, having spent the young villain's life shaping him into a successor. "If it's freedom you desire, then submit to me, my brethren. And bear witness, by my side. This impending void era will give rise to a more perfect demon lord."