Yagi Toshinori

In his empowered form, Toshinori is a towering figure with a 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 eyes.

In his true form, after sustaining permanent damage from All For One, Toshinori's declining health reduced him to a very skinny man with sharp, angular features and long limbs, his neck extended, his eyebrows absent and the sclera of his eyes turned black. His hair is wavy, with two long strands coming down from his hairline and framing his face. He possesses a large scar covering most of the left side of his chest, having lost his stomach and some of his lungs' respiratory system. It is common for him to spout blood from his mouth when excited or surprised. He typically wears baggy clothing to accommodate the change in body mass between forms, but after Toshinori's tenure as a hero, he starts wearing clothes that fit him in his regular form, as he no longer needs big clothes that fit his muscle form.

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.

Overall Abilities: While officially earning the rank of the Number 1 hero of Japan, All Might was also well-recognized as the strongest and greatest hero in the world. He was the "Symbol of Peace" and such a deterrent against crime that villains were primarily discouraged by his presence in society, single-handedly bringing near-absolute stability throughout Japan, a stark contrast to the rest of the world. He defeated All For One, infamously known as the world's most powerful villain, twice, a feat that all the previous wielders of One For All could not. Despite winning, All Might suffered a gruesome injury at the hands of All For One that limited his maximum power output going forward, gradually reducing his sheer might and how long he could use his power.
Trained Muscles: Usage of One For All requires the user to have strong muscles, as One For All is a lot to handle and could cause the user's body to be blown apart if they don't possess the necessary body strength. Gran Torino said that All Might, in particular, had a strong body that allowed him to master One For All much faster than previous users.
Indomitable Will: All Might's will is evident in all his actions as a hero. He is known for saving people with a smile and his catchphrase, "I am here," two facets of being the Symbol of Peace. During the pinnacle of his battle against the U.S.J. Nomu, All Might remembered his resolve to be the Symbol of Peace, and his resolution allowed him to push beyond 100% of his power to defeat the artificial human finally. Another prominent spectacle featuring All Might's willpower was during his last two showdowns with All For One.

One For All: Transferred to him from Nana Shimura, Toshinori's Quirk allowed him to stockpile an enormous amount of raw power, significantly enhancing all of his physical abilities to a superhuman level, resulting in unbelievable feats of strength, speed, agility, and durability. Seemingly unique to him, Toshinori's mastery of this Quirk enabled him to morph himself into a towering, powerfully built man to hide his identity from society.

• Immense Strength: All Might's most distinguishable trait was his boundless levels of physical strength. A single punch from All Might could not only defeat a villain but completely change the weather subsequently. It also can destroy several city blocks from the wind pressure it creates.
• Immense Speed: In conjunction with his immense physical strength, All Might also possessed equally impressive speed.
• Immense Durability: All Might held extreme durability, to the point of being almost entirely invulnerable to attacks.
• Immense Stamina: In his prime years, it was noticed that All Might has never been shown to be exhausted, even when fighting against multiple villains.