He is well-informed about almost every significant figure among heroes and villains. However this is superficial charm by which All For One fools people into following him. Despite his hegemony, All For One is polite and sympathetic towards his subordinates and associates. When encountering the previous wills of One For All in the mental world, the vestige of All For One was not troubled when Tomura started to loathe him, stating that this hatred was only more fitting for the Symbol of Fear.Дue to his immense power and confidence, All For One has a calm and condescending demeanor, confident even when thwarted. When mentoring Tomura, All For One gave him the hands of his deceased relatives as a way for the negative feelings in his heart to always remain close. He is also a firm believer in the hatred of the heart, believing it to be a very strong source of power. He loathes All Might in particular for ruining his syndicate and crippling him. This is made apparent during the Paranormal Liberation War, when All For One forcibly possesses Tomura despite the latter's protests.ДЄll For One despises those who persistently defy him, especially the users of One For All. However, this benevolence is a faГ§ade, because All For One views Tomura as a valuable tool to steal One For All.

He also prefers to teach Tomura by providing him opportunities and different experiences. He offers constructive criticism and encouragement to Tomura whenever the latter fails. Presently, All For One's greatest obsession is to steal One For All, a Quirk that originated from Yoichi and the one Quirk that he cannot steal.ДЄll For One is a patient mentor towards his protГ©gГ©, Tomura. All For One has a firm contempt for ideals of justice and morality, dismissing them as beliefs of other people that shackle personal freedom. He mocked his frail brother, saying that without power, it is impossible to assert one's ideals. In the past, All For One cared for his younger brother Yoichi, although he was condescending towards him. He also displays signs of kleptomania, claiming that he can't resist stealing a powerful Quirk when the opportunity presents itself. All For One shows signs of megalomania, comparing himself to the Demon Lord he read in comics. Those who defied his will were purged by his followers. Once they were no longer able to follow his orders, All For One would callously abandon them. In the past, All For One did use his powers to help people, but in exchange for their servitude. Yoichi gives insights into his personality to Izuku Midoriya in a dream. He likes to rule from the shadows and enjoys himself at the expense of people. When All For One left his secret hideout during the Kamino Incident, he donned a navy blue, skull-like gas mask with angular tubes at the top, a wide collar-like life-support system around his neck with additional pipes connecting in the front and back, presumably to help him breathe.ДЄll For One is a sadistic and malevolent man. He usually wears a dark suit over a white shirt. However, his face has never been clearly shown, and his eyes are often shadowed. In the past, All For One possessed strong, imposing features, short white hair, and luminous red eyes. There is a small hole in each palm of his hands, which is how he steals and transfers Quirks. All For One is blind, but 'sees' by using an Infrared Quirk and by sensing the directions of vibrations in the area around him, similar to echolocation. As such, he has no visible nose, ears, hair or eyes, though the outlines of eye sockets are visible.

After being mortally injured by All Might years ago, All For One's face is entirely made up of scar tissue, extending from above his upper lip and covering his entire head and the back of his neck.

My hero academia all might