Among all the major characters in My Hero Academia, few are as mysterious and bizarre as All For One, the self-styled symbol of peace. After six seasons of the My Hero Academia anime, fans now know more about the symbol of evil than ever before, but even all the clues, when scraped together, don't fully reveal who he is. Evidently, author Kohei Horikoshi is making an important point about who All For One is and what he represents in the My Hero Academia world.
Source：https://www.cbr.com/mha-all-for-one-true-identity/
