Toshinori Yagi

All Might (オールマイト, Ōrumaito) is the No. 1 Hero and the "Symbol of Peace".

Appearance
In his hero form, All Might is a very tall and over-musculated man whose design resembles the American hero comics. His hair spikes on top of his head and his whole body has more shadows than a normal human being. However, in his true form, he is an overly-skinny man who spits a lot of blood out of his mouth and his clothes appear wider. Note that in both forms, his eyes are sunken in, but the difference is that you can see his eyes in his true form.

Personality
All-Might's hero persona derives much from American hero stereotypes, in which that they're colorful and have a lot of dramatic flair. Always sporting a giant smile, he usually shows off a bright, can-do attitude that borders on being obnoxious. All-Might also tends to be extremely friendly and amicable, due to his popularity and years in the spotlight. However, when All-Might reverts back to being sick and scrawny (as a result of a previous battle), he tends to be less energetic due to his constant blood-spitting. Additionally, tries not to draw much attention to himself while in his true form, always afraid that others might learn of his current state of health.

Two personality traits always persist, though, whether he's in hero-mode or normal-mode: his optimism and his oafish-ness. All-Might has always had faith and hope that someone would come along, worthy enough to bear the "One for All" quirk. The manga also depicts him as sometimes being outsmarted by his students, and even his fellow teacher, Shouta Aizawa has called him an idiot a few times.

Entrance Exam Arc
All Might first appears when Izuku is being attacked by a villain. He then uses Texas Smash on the villain, saving Izuku. All Might is glad to see that Izuku is all right. He then decides to leave, asking Izuku to continue to support him. However, he is forced to land after Izuku grabs on to his leg. After doing so, he tries to leave again, but Izuku questions him on whether he can become a hero without a Quirk. All Might reverts back to his true form, shocking Izuku. He then tells Izuku is proffessionals must always put their lives at stake to save the day and thus cannot openly say whether it is possible to be a hero without a Quirk as it may not be possible. All Might says that if Izuku cares about saving people, he can always go on to become a policeman, as in that way he can be responsible for putting the villains in jail (even though it is ridiculed). He tells Izuku that it isn't bad to dream, but warns him not to obscure the facts and then leaves. All Might then sees that he wasted time in talking with Izuku, causing the villain he defeated before to escape, saying to himself that he is pathetic. After seeing Izuku's bravery in trying to save Katsuki from the villain, All Might decides to step in and uses Detroit Smash to defeat the villain, saving both Izuku and Katsuki. All Might then appears before Izuku, saying to him that he thanks him and has a proposal for him. He tells Izuku that he was touched by Izuku's bravery for trying to save someone despite not having a Quirk and tells him that he too can become a Hero.

All Might tells Izuku that he is worthy to inherit his strength. He tells him that his Quirk can be passed down and that Izuku has been chosen by him to be the next one to inherit his Quirk. Izuku asks why he would give someone like him his Quirk, to which All Might responds that he has been searching for a successor for a long time and now has found someone that he doesn't mind giving his Quirk to, saying that he despite not having a Quirk, tried to save somebody and that he shined more than any of the other heroes. Thus, All Might's proposal is whether he wants to inherit the One For All Quirk from him or not. Izuku accepts All Might's proposal. All Might begins to train Izuku for the next 10 months, explaining to him that in order for him to inherit his Quirk, Izuku's body (vessel) must be strengthened to the point of being able to handle the Quirk's power. All Might trains Izuku at the Seaside Park, a place filled with trash and tells him that he will clean up all the trash as part of training his body to become stronger. After 10 months have passed, All Might tells Izuku that he is now a genuine vessel. He then decides to give Izuku his reward for working so hard for the past 10 months: the One For All Quirk, saying that he has earned it fair and square. All Might gives Izuku his reward (a piece of his hair) and tells him to eat it so that he can inherit his Quirk.

One week later, Izuku receives a letter that will determine whether he was accepted into Yuuei or not. Izuku opens the letter in his room and a screen with All Might on it appears. He apologises for not contacting Izuku earlier and informs him that he will be working as a teacher at Yuuei. All Might tells him that he did fine on the written test, but since he scored zero points during the practical test he has failed. However, All Might tells him that because he rescued someone during the practical test, he earned 60 points, meaning he has passed and therefore being accepeted into Yuuei, much to Izuku's joy and happiness.

Quirk
"One For All" - All Might's Quirk grants him super strength, greatly enhanced agility and the ability to fly.

Moves

 * Texas Smash (Move): All Might throws a right punch with enough force that the wind pressure sends anything made of liquid flying away. This move was first used to save Izuku Midoriya from an unknown enemy in Chapter 1.
 * Detroit Smash (Move): All Might preforms that same attack as Texas Smash except her down is with a downward punch instead of a straight punch, the punch is powerful enough to create a large shock way that cleared the weather. This move was first used to save Izuku Midoriya and Katsuki Bakugou from an unknown enemy in Chapter 1.
 * Missouri Smash (Move): All Might runs towards an enemy while keeping his hand flat and hit the enemy one the head while running past them. This move was first used against Vihara Headgear in Chapter 13.

Battles
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5 Years Before Story Begins

 * All Might vs. Super Venom Chainsaw: Lose

Entrance Exam Arc

 * Izuku Midoriya and All Might vs. Unknown Enemy: Win

Rescue Trial Arc
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 * Kamui Wood, Mount Lady & All Might vs. Vihara Headgear: Win

Izuku Midoriya
At their first meeting, All Might thought that Izuku was just a fan, but he started to acknowledge him when he jumped to save Katsuki from the Hedoro Villain. From that moment, he was touched by Izuku's bravery (despite not having a Quirk) and decided he would pass his powers to Izuku, feeling that he is the only one worthy enough to inherit his strength, and they started to share a feeling of mutual respect for each other.

Shouta Aizawa
Not much is know of their past, but because of their personalities, they don't get along.

Kango Kyouyu
Kango is one of All Might's friends that know about his condition and his Quirk.

Trivia

 * He likes movies.
 * His signature moves are named after states and cities in America.