All For One is the primary antagonist in the anime and manga series Boku no Hero Academia (My Hero Academia). Known for his mysterious and malevolent nature, he is the mastermind behind many of the villainous events in the story. All For One possesses the unique Quirk that allows him to steal and bestow other people's Quirks, making him extremely powerful and influential. He serves as the arch-nemesis to the series' protagonists, particularly All Might and the heroes, orchestrating chaos from behind the scenes while mentoring Tomura Shigaraki.