After being gravely wounded by All Might years earlier, All For One’s face became a mass of thick scar tissue that stretched from above his upper lip and covered his entire head and the back of his neck. As a result, he lacked visible facial features such as a nose, ears, hair, and eyes, though the faint outlines of his eye sockets remained. Rendered blind, he relied on an Infrared Quirk to perceive his surroundings, detecting vibrations and movements in a manner similar to echolocation. Each of his palms had a small hole through which he could steal and transfer Quirks, the core of his terrifying power.

His usual attire consisted of a dark suit over a white dress shirt. During the Kamino Incident, when he emerged from hiding, he wore a navy blue, skull shaped gas mask with sharp, angular tubing, along with a wide, collar like life support device around his neck connected by several pipes that helped him breathe.

In his earlier years, All For One was an imposing figure, tall, broad shouldered, and powerfully built, with short white hair and pale, emotionless eyes. When interacting with the Shimura family, however, he appeared in a more refined form, dressed in a formal suit and hat. His face was rounder and softer, with a seemingly kind expression and closed eyes, suggesting he altered his appearance with a Quirk to appear more approachable.

All For One was a subtle and sadistic manipulator who ruled from the shadows, taking pleasure in using others before discarding them. In the early days of Quirks, he exploited the chaos by offering people anything they desired, power, purpose, or even peace, in exchange for loyalty. He claimed to bring order to a crumbling world, but his true intent was domination. All For One took Quirks from those who did not want them and granted them to those who did, building an army of followers bound by greed and dependence. Once they outlived their usefulness, he cast them aside without hesitation, ensuring absolute control through fear and deception.

Driven by megalomania, All For One viewed himself as a godlike being, likening his existence to that of a Demon Lord from childhood comic books. He saw others as inferior, mere tools to further his ambition. Despite claiming to care only for his younger brother Yoichi, he treated him as a possession rather than family, abusing him for his weakness and rejecting his ideals of justice. All For One’s ultimate goal was to rule over humanity as an all powerful evil, a living embodiment of the darkness he once admired in fiction. Yet, in his pursuit of control, he created his greatest rival, the One For All Quirk, born from the brother he sought to dominate, and with it, generations of heroes dedicated to ending his reign.

His cruelty extended to those he mentored. When he found the young and broken Tomura Shigaraki, All For One appeared as a benevolent savior, nurturing him and even giving him his surname. But beneath the facade of care, he saw Tomura only as a vessel, a future body to inherit his power. He manipulated the boy’s trauma, fueling his hatred and molding him into a weapon to destroy the legacy of One For All. All For One’s twisted sense of pride showed through his delight in Tomura’s progress, even as he stripped away his protege’s free will. His influence was so deep that he could control Tomura’s body during battle, proving that every act of kindness was merely a step in his plan for immortality.

In the end, the so called Demon Lord’s arrogance led to his downfall. As the Final War unfolded, the cracks in his composure began to show. The endless resistance of heroes, the influence of Tomura’s will, and the effects of the Rewind Drug left him desperate and unstable. He raged at those who defied him, unable to accept that his control was slipping away. When death finally came, All For One was reduced to fear and tears, realizing that his desire to be remembered stemmed from loneliness, not strength. Even in his vestige’s final moments, he admitted that ruling the world without Yoichi was meaningless. For all his power, cruelty, and pride, All For One died not as a Demon Lord, but as a hollow man chasing the love of a brother he could never truly possess.

All For One was an ancient and powerful villain who ruled Japan from the shadows for over a century. He possessed the Quirk All For One, which allowed him to steal and use the powers of others. Despite his unmatched might, he could never take the Quirk One For All, a power he accidentally created. Generations of heroes inherited One For All to oppose him, culminating in his long and brutal rivalry with All Might. Their climactic battle left All For One critically injured and reliant on a life-support system, marking the first major blow to his reign of terror.

Even after his defeat, All For One remained a formidable threat. From his prison cell, he continued to manipulate events, nurturing Tomura Shigaraki as his successor. His intellect and vast knowledge of Quirks made him nearly unstoppable, allowing him to predict and counter his enemies with terrifying precision. When he escaped from Tartarus Prison, he led a renewed assault against the heroes, proving that even age and injury could not diminish his influence or power.

In the Final War, All For One’s power surged once again after using a reverse-engineered Rewind drug that restored his youth. He overwhelmed top heroes like Endeavor, Hawks, and Best Jeanist, combining his stolen Quirks into devastating attacks. However, the Rewind effect also accelerated his regression, gradually reverting his body to that of a child, then an infant, and finally nothingness. His arrogance and obsession with control ultimately brought about his end.

Though feared as the Symbol of Evil, All For One was defined by his loneliness and desire for dominance. His cruelty, manipulation, and lust for power left behind a legacy of destruction. In the end, he was undone not by weakness, but by the will of those who stood against him. The heroes he sought to crush proved that unity and hope could triumph over even the darkest evil.