Template:Toshinori Synopsis/History

The Origin of All Might
Toshinori was born Quirkless during a time in the world where evil ran rampant due to the influence of All For One. Crime rates were on the rise because citizens had no hero to believe in. This inspired the boy to become a powerful hero who could provide hope for innocents and defeat evil.

During his teenage years, Toshinori met a pro-Hero named Nana Shimura and explained his ideals to her. He told Nana that he wanted to create a world where everyone can smile and live happily together. For that to happen, the world needed a "Symbol of Peace" to inspire a new age of harmony. Toshinori believed he could become the pillar that inspires people everywhere. Nana believed the Quirkless boy and took him as her apprentice. She trained Toshinori and passed One For All down to him, making him the eighth torchbearer of the great power. Toshinori went on to wield the power for forty years.

Toshinori attended U.A. High School, where Nana's friend, Gran Torino, served as his homeroom teacher and trained him. Toshinori's body was strong enough to utilize One For All at 100% from the start of training, so Gran Torino mainly focused on teaching Toshinori how to properly fight, although his training methods were so harsh that he accidentally instilling an innate fear within him.

All Might Rising
Inheriting One For All comes with the danger of facing All For One. Eventually, Toshinori, Nana and Gran Torino faced All For One, but the villain was too powerful. Nana sacrificed herself so that Toshinori could live on, entrusting his safety to Gran Torino. Toshinori could only watch as his master gave her life against All For One's supreme evil.

As a promise to his close friend Nana, Gran Torino continued training Toshinori in her place. However, Toshinori was distraught after the death of his master and was unable to train to his potential. Thoughts of revenge plagued Toshinori's mind and he wished to avenge Nana, who he saw as a true hero. Gran Torino reminded Toshinori that his enemy is a man who's walked the earth for over a hundred years. Toshinori cried while saying his master gave up everything to raise One For All's next torchbearer and admits he thought of her as his own mother.

Gran Torino recommended him to train in the United States after he graduated so All For One could not reach him and to gain experience as a hero. He reminded Toshinori why Nana sacrificed herself and restored his resolve. That spring, Toshinori graduated from U.A. and prepared to cross the ocean. Before he departed, Toshinori reminded himself of his master's trademark smile. He shaped his hair and donned what would become his own signature smile for the first time as All Might.

All Might in America
Soon after moving to Los Angeles, California, Toshinori rescued a group of scientists from an explosion. One of these upcoming student scientists was David Shield. David thanked Toshinori and noticed his destroyed attire. He developed a sturdy hero costume that would come to be known as All Might's young age costume. Toshinori and David would quickly become best friends and acted as a hero team throughout California.

Toshinori shared his dreams with David. He told him that he desired to become a Symbol of Peace and shine a light on the world. Together they took down a pair of L.A. Villains and David even relayed All Might's message to everyone watching, truly believing that one day All Might would become the world's top hero. Eventually, he met Melissa Shield, David's daughter, who was born Quirkless. Over time, All Might would serve as an uncle figure to Melissa. He encouraged her to become a support engineer in order to help other people, just like her father.

Return to Japan
Eventually, Toshinori returned to Japan and his meteoric rise would only continue through the Bronze, Silver, and Golden ages of his career. Eventually becoming the world's Symbol of Peace and No. 1 Hero. All Might reached the pinnacle dreams and inspired a new age of Pro Heroes where the country finally knew peace. Japan's crime rate dropped down to below 6% because of All Might's presence, issuing in an era of peace. However, the looming threat of All For One was still present.

At some point he met Mirai Sasaki, a huge fan of him who wanted to be his sidekick. At first, Toshinori refused due to his policy of not taking anyone. However, Mirai was so persistent that All Might eventually let him be his sidekick, under the name of Sir Nighteye. Thanks to his ability to see the future, Sir Nighteye would act as the brains of All Might's operations while the No. 1 Hero was operating at the peak of his career. For many years their partnership worked well, even Toshinori revealed the truth about One For All to his him.

The Underground Masquerade
All Might returned to the Might Tower after spending three days resolving consecutive incidents, setting a new record. After thanking the reporters and journalists gathered there for their encouragement and congratulations, All Might retired behind the Might Gate to rest. Before going to sleep, Toshinori asked Sir Nighteye for any last minute job, but his sidekick told him his priority should be resting after going 72 hours working non-stop. Just then, they received an emergency dispatch from Osaka after the Might Signal was activated. Sir Nighteye wanted to check first if local heroes can take care of the situation first, but All Might transformed into his muscular form and and blasted off, knowing Osaka's calling for him personally.

The reason for that emergency was caused by All For One, who in his desire to steal the Quirk Overclock from the hero O'Clock, had transformed several people into a violent mob that was rampaging through the city. Once he arrived to Osaka, and in the blink of an eye, All Might defeated all the villains. Then, after being informed of the situation, he goes to the place where the crowd emerged, but when he arrived all trace of All For One had disappeared, with only O'Clock and a couple of his allies at the scene.

After fixing the situation, the citizens of Osaka rejoice as All Might tops a new record in defeating nearly one hundred villains in one fell swoop, as well as assisting in many aspects of the clean up, before leaping off and heading back home for a proper rest.

The beginning of the end of All Might
Eventually, destiny caught up with him, and once again, All Might was brought face to face with All For One. The Symbol of Peace became the first torchbearer to defeat All For One, completely crushing his head and severely damaging the rest of his body. All For One's reign over Japan was finally ended, and All Might took steps to ensure that their battle wouldn't reach public eyes or records, being kept a secret from most people in the world. However, this victory was at the cost of critical injuries dealt to him, as All Might's stomach was lost and his respiratory system was damaged beyond repair. This created a limit on how long All Might could use One For All, reducing his ability to be the Symbol of Peace.

Due to his injures and condition, Sir Nighteye pleaded with All Might to retire, as he didn't want All Might to push himself to the brink of death, but he refused. Nezu agreed with Sir Nighteye and told All Might that he could look for a successor of One For All in U.A., an idea that Sir Nighteye considered as the best option. Toshinori agreed that the Symbol of Peace would need a successor but refused to step down in case any new villains stepped up.

All Might asked who the Symbol of Peace would be until he finds that successor. Even though All For One was gone, another villain like him will eventually appear. Sir Nighteye threatened to stop helping should All Might continue his reign as the No. 1 Hero. He even used his Foresight Quirk to warn All Might of his impending death. He told him that in six to seven years, he will confront a villain and head towards a gruesome death. All Might ignored Nighteye's warning and they dissolved their partnership completely.

In order to raise a proper successor, All Might enlisted himself as a teacher at U.A. High five years later. He spoke with Nezu about a potential replacement, and the principal believed that Mirio Togata, one of U.A.'s students, would make a fitting successor to One For All.

Vigilantes Beginnings Arc
During the period between when he defeated All For One until he became a professor at U.A., Toshinori was involved in a series of events caused by a criminal organization known as the Villain Factory, whose goals were unknown. For several weeks, the Villain Factory was dedicated to distributing through Naruhata streets a drug known as Trigger, an illegal substance that boosts Quirks but turns its consumers in violent Instant Villains, causing several incidents.

One day, one of the Factory's agents, Kuin Hachisuka, uses her Queen Bee Quirk to inject the drug into innocent civilians, turning them into a horde of Instant Villains, causing chaos at the streets. Suddenly, All Might and several other heroes such as Airjet, Ingenium, Endeavor, Midnight, Eraser Head, and several others, appear and in a short space of time, they suppress all the Instant Villains.

Due to the villain outbreak, where several innocent people were turned into Instant Villains, detective Eizo Tanuma organized a meeting in the Police Station with several of the heroes who helped to stop the outbreak to discuss the situation and the best action to take. Because All Might could not attend, Eizo sent his partner Naomasa Tsukauchi to the Might Tower to request All Might's help in dealing with the Trigger outbreak, specifically telling him to talk to his secretary-manager, Toshinori Yagi.

On the top floor, the receptionist tells Naomasa that All Might will be returning shortly from Hokkaido. The Might Tower's roof opens up and All Might lands down. Many reporters ask All Might questions about global affairs. However, All Might apologizes and decides to leave office affairs to his staff; All Might retreats behind the Might Gate, which is only accessible to All Might himself.

Naomasa couldn't talk to All Might but went to the receptionist to ask for Mr. Yagi. Coincidentally, Toshinori Yagi (All Might in his true form) is by the receptionists as well and hears Naomasa's request. Toshinori and Naomasa chat in Might Tower cafe, with Toshinori introducing himself as Might's Productions Second Secretarial Office and that he handles All Might's private affairs. Naomasa explains the Instant Villains rampages that have been happening recently, to which Toshinori suggests that heroes should be more cautious going forward.

However, while they are having a conversation, Toshinori constantly makes excuses and runs to perform quick deeds as All Might. In the end, Toshinori accidentally returns with the uniform still visible, revealing his dual identity as All Might.

Toshinori asks Naomasa to keep his identity a secret, to which Naomasa replies that he will, but he tells Toshinori that the Police Force is troubled by his spontaneous acts of heroism and calls him out on not filing reports on all of his heroic activities, as customary of a Professional Hero. Toshinori is well aware that he must follow standard procedures when heroes wield their powers, but he wants to help people without being burdened by unnecessary procedures. While Naomasa understands him, he tells that every hero must follow the rules, and it would be a bad example if people know that the Number One Hero neglects his Hero duties.

Taking pity on All Might, Naomasa offers to file the reports himself, letting All Might act without any worries apart from telling him about his unplanned Hero activities. Toshinori is delighted with Naomasa's offer and accepts it, exchanging his personal contact number with him. The next day, Naomasa receives several cases of All Might's unplanned Heroics and wonders if it was Eizo's plan to push All Might's ordeal onto him from the start.

Sky Egg Arc
After this, Toshinori and Naomasa become friends, and for the next months, they have several meetings to keep themselves informed of their mutual jobs, with All Might carrying out his hero duties and Naomasa continuing with the police investigation to stop the traffic of Trigger and the Villain Factory. One day, after resolving a series of incidents in Okinawa, Toshinori Yagi returns to the Might Tower for a meeting with Naomasa in the building's cafeteria, only to find out the detective has his arm in a sling and several fractures. Naomasa explains to him that his injuries are the result of a confrontation he had against Number 6.

Although he tries to not give importance to his injuries, Toshinori is worried and tells him that if he had known, he would have come to help him. The detective replies that his public figure, All Might, can't be taking jobs for personal reasons, and can't prioritize saving certain people because they could be taken hostage or used as a diversion by villains. Toshinori can not deny that he is right.

With the start of a new year, detective Naomasa and Toshinori have another meeting, in which they say they hope to continue working together another year. Naomasa informs him that recently they have obtained new and important information about the case he is investigating. All Might offers to help him but, although he is grateful, Naomasa tells him that it is not possible.

Police investigations lead Naomasa to discover the place where the Villain Factory carries out its illegal experiments. A police raid takes place, but Number 6, the same villain who left Naomasa badly wounded the previous time, is there, and he blows up the place before escaping with five creatures called Bombers, in order to attack the Tokyo Sky Egg and kill Captain Celebrity. Luckily, Naomasa survives, and in a police helicopter, he goes to the Tokyo Sky Egg, where he sees several heroes fighting the Bombers. The hero Eraser Head is with him and asks him to call All Might to come to the place to help because although it seems that the heroes are winning, the threat is not over yet.

Naomasa agrees to Aizawa's request and calls All Might, who at that time is in a meeting at the Might Tower as Yagi Toshinori. Upon hearing Naomasa's call, Yagi apologizes and goes to a secluded area to talk to him. Naomasa tells him that the Tokyo Sky Egg is in trouble, but before he can clarify the situation, Yagi hears an explosion on the phone. Seeing how his creatures were being defeated, Number 6 had ordered the last one to self-destruct in a powerful explosion, which caused the Tokyo Sky Egg to begin to collapse, with thousands of people inside.

Upon hearing the explosion and Naomasa's request for help, the number one hero immediately leaves the Might Tower, taking him only a few seconds to reach the place and, in a flash, he smashes the remains of the tower out of the way, flattens the ground, brings animals to safety and lands the Tokyo Sky Egg dome safely, saving everyone. The bystanders are stunned by that inhuman feat and start cheering for All Might.

The media reports the Bombers' attack on the Tokyo Sky Egg, while hosting a large-scale event with some of the most famous heroes, and how All Might saved everyone from the disaster when the tower began to fall. Journalists and reporters ask All Might about his opinion. He simply thanks that there are no fatalities, and praise the efforts of the Pro Heroes, law enforcement and relief workers to care for the victims. After his statement, he says goodbye and runs away, being pursued by the media. After eluding them, All Might, now as Yagi Toshinori, returns to the place and meets secretly with Naomasa. He tells him that he's going to stick around for a while in case there's another attack.

Naomasa apologizes for getting bent out of shape, but Yagi tells him that it's fine and that it was his impassioned plea that got him there in time. Yagi explains to Naomasa that his Quirk has a strong psychological component to his strength. When he hears a plea for help, he feels it like a direct order to All Might. He tells him that when he accepted his power in order to save everyone and give them hope.

Naomasa feels confused about how he "accepted" his power, and All Might realizes that he has unwittingly revealed an important fact regarding One For All and its secrets. Before their conversation continues, they are interrupted by Shota Aizawa, Fat Gum and Monika Kaniyashiki, and Naomasa introduces them to Toshinori, who thinks that one of these days he will have to explain Naomasa everything about the secret behind All Might.

In the distance, at the top of a building, Number 6 watches the whole scene, still furious that All Might ruined his plans. However, he does not give up. and uses a device again to reactivate the Bombers' remains. The busted Bombers' pieces and bits start to regenerate, combine and grow into a gigantic and uniform mass of flesh that bursts releasing a swarm of two hundred mini Bombers to attack everyone, in his last attempt to cause a tragedy. Number 6 is confident that even All Might will not be able to destroy all the creatures, so he is sure that this attack will cause some deaths.

Everyone is surprised at this sudden attack, but it generates the appropriate distraction for Yagi to transform back into All Might, destroying the entire swarm with his Nebraska Smash, saving thousands of lives again. Number 6 can not believe what he just saw.

Naruhata Lockdown Arc
Several years have passed since the Sky Egg Bombing, and since then the mastermind behind it, Number 6, has cooked up a revenge plan against Koichi and a hospitalized Kazuho. A few days later, as promised, Number 6 decides to carry out his threat, and to do so, he first causes a blackout in Naruhata, cutting off all communications and causing all series of riots with his Anonymous ordered to keep the heroes busy. He then storms the hospital, but Koichi and his allies force him to flee. With communications cut off, Naomasa asks Koichi to leave Naruhata and summon All Might, while they take care of the rest, but in the end Koichi decides to stay to face Number 6 himself.

Meanwhile, in the cafeteria of the Might Tower, Toshinori is relaxing, eating his meal, and received the news broadcast talking about the Naruhata crisis. Toshinori hopes Naomasa’s job doesn’t get delayed due to the chaos. At that moment, he receives a phone call asking him to contact All Might to stop a Namahage attack in Akita. Toshinori decides to leave and tells the waiter not to clear his plate since he will come back. Once the problem in Akita is solved, Toshinori returns to the cafeteria to finish his dinner, but he is called again to request All Might to solve another problem in Tokushima.

Eventually, news of the escalating threat, particularly the giant fiery kaiju that Number 6 has transformed into, reaches Toshinori's attention through the news, blasting off out of the Might Tower toward Naruhata. In no time flat, he breezes past Endeavor through the sky and entering the city, effortlessly knocks all the mini bombers that emerged from the kaiju into the air, allowing Endeavor to safely dispose of them. With the danger averted, All Might rushes into an alleyway to transform back into Toshinori, where he is helped by Naomasa.