All Might

All Might's hero persona appears to be derived from comic book superhero stereotypes: exuberant and filled with dramatic flair. He always protects and saves innocent people with a huge smile. The habit of smiling was ingrained in him by his mentor, Nana Shimura, who believed that the ones who smile are the ones who are the strongest. Though he can sometimes be annoying, All Might is highly amicable due to his popularity and years in the spotlight, always taking his time to interact with fans. Once All Might reverts to his true form, he becomes reserved and solemn, avoiding attention in direct contrast to the grandiosity of his hero identity. While he's an optimist, he still ensures his goals are grounded in reality. When a Quirkless Izuku tells him about his goal of becoming a hero, All Might commends him for having a dream but reminds him to stay realistic and suggests he enter another profession that helps people. He considered the harsh words necessary to save the boy from long-term frustration. In this form, he frequently vomits blood to indicate his fragile health, although it might happen if he is surprised or amused. Regardless of which form All Might is currently taking, two personality traits always present in him are his optimism and oafishness. Since his youth, All Might had always carried a single yet burdensome goal: to become a pillar of hope that people could always rely upon during harsh times. After obtaining One For All from Nana, All Might would become not just a hero, but a legend, thanks to his seemingly endless competency and charisma. No matter who or what he faced, All Might would stand up triumphantly every time, one battle after another, inspiring the world and sending fear to the hearts of villains everywhere. All Might has a chronic ability to save as many people as possible, a trait shared with his successor. He exhausted himself and fell behind on his other hero duties, such as filing paperwork. Though he was embarrassed by it, he still gratefully accepted the offer of Sir Nighteye and (later) Naomasa Tsukauchi to file his reports.

Appearance: All Might is a towering figure with a powerfully muscular and well-defined physique, resembling a classic Western comic book superhero. He has chiseled facial features, including a strong jawline, pronounced cheekbones, and bushy eyebrows. His short blond hair is swept backward, with two distinct tufts that stick up slightly to each side. His robust features often cast a shadow over his face, revealing only his striking blue pupils. All Might's Golden Age hero costume consists of a skin-tight blue bodysuit adorned with a red symbol that resembles a "Y". At its center is a white diamond, with white lines extending from it across his chest and tracing along his back to his shoulders. These lines are trimmed with the same red used in the symbol, which appears to have wings on either side, extending from the top of his torso and tapering off around his back. Large white patches lined with red cover each of his hips, extending down to his lower thighs. He wears a gold belt with a silver buckle featuring red eyes. His forearm sleeves are gold, decorated with white lines and blue accents over his wrists, complemented by spiked fins on the sides of his arms. Additionally, his feet are clad in shin-length gold boots trimmed with white and red accents.

Toshinori Yagi (八や木ぎ俊とし典のり Yagi Toshinori), also known as All Might (オールマイト Ōru Maito), is the former No. 1 Pro Hero who bore the title of the world's Symbol of Peace (平和の象徴 Heiwa no Shōchō). He taught Foundational Hero Studies at U.A. High School, and now serves as the school's vice principal eight years after the Final War. All Might was the eighth holder of the One For All Quirk after receiving it from Nana Shimura. He has since passed the torch onto Izuku Midoriya, whom he trained to be his successor. After using up all the embers of One For All to defeat All For One, All Might retired and ended his era as the world's greatest hero.