One For All

One For All (ワン・フォー・オール) is the transferable Quirk that is possessed by its ninth and current host, Izuku Midoriya.

In the past, it was used by its previous hosts, Nana Shimura, Toshinori Yagi, and the first six users before them.

History
Long ago, All For One, a man with a Quirk that allows him to steal other Quirks and give them away, forcibly gave his seemingly Quirkless younger brother a Quirk that allowed him to stockpile power within his body. However, unbeknownst to either one of them, the younger brother already had a Quirk with no other power than that it could be transferred to another person. The transference Quirk and the power stockpiling Quirk merged into one and from then on became One For All.

The younger brother somehow discovered this. He had a strong sense of justice and he tried to defeat All For One, but given the huge difference in their strength, he failed. The younger brother decided to entrust the Quirk to future generations of Heroes, hoping that they would cultivate One For All and one day put a stop to All For One. Very few knew the truth about One For All, for fear of what villains would do if they found out that the world's most powerful Quirk could be transferred.

All For One sought after One For All and as a result, almost all of the users of One For All fought and were killed by his hand, but not before they each had the chance to pass on the Quirk to a successor so that it could reach the future and elude the villain.

The seventh user, Nana Shimura, was the last holder killed by his hand, while her apprentice and heir to One For All, All Might, fought All For One at least twice, winning both battles. The Quirk was passed down through nine generations, growing stronger with the passage of time. Currently, One For All is one of the most powerful Quirks in existence; however, it proves very difficult to fully master, and thus its full capabilities haven't been revealed yet.

Description
One For All is a transferable Quirk that can be passed on from one user to the next. Its name comes from its nature; being 'one' Quirk for 'all' people. In order for the Quirk to be transferred, the recipient must ingest a sample of the predecessor's DNA (ex. a strand of hair or a drop of blood).

In order for the Quirk to be transferred, the current owner must freely choose to transfer it. Because of this, the power cannot be forcibly taken. However, it can be forcibly given, as the recipient doesn't have to agree to anything. Since One For All can't be forcibly taken, it is the only Quirk that can be used in combat against All For One, as any user of All For One would simply be able to steal any other Quirk.

One For All also allows the user to stockpile an enormous amount of raw power, allowing them to significantly enhance all of their physical abilities to a superhuman level. This results in unbelievable levels of strength, speed, agility, and durability.

The user can focus the stockpiled power into a single body part, or spread the power evenly throughout their body, although, focusing the power puts a greater strain on the part of the body where the power is focused. The user is also able to control the percentage of the power that they activate.

One For All can even grant the user an exceptional strength boost to their given Quirk if they have one.

The core of One For All has grown in strength from being passed from user to user, and the Quirk Factors of all of the previous users have merged into the core, granting the current user the ability to access these Quirks. The Quirks have significantly increased in strength since they were used by their original users; this is due to the nature of One For All's core stockpiling power and increasing in strength from user to user.

In addition to the Quirk Factors merging with the core, One For All carries echoes of the consciousnesses of all of the previous users. Much like its counterpart Quirk, All For One, these echoes have the ability to take some control over the current host's body as seen when the echoes first manifested itself to Izuku when he was under the control of Hitoshi Shinso's Brainwashing quirk and these echoes controlled his finger to activate One For All to break Izuku's finger to help him break free from the Brainwashing quirk's influence.

One For All has some kind of subconscious realm where these echoes exist. The realm seems to have some connection to One For All's counterpart Quirk, All For One. It is later revealed that this is due to the fact that Quirks are engraved with the consciousnesses of their users, so any new user who receives One For All has their conscious embedded and placed into the subconscious realm.

One For All draws power from the cries of help of those in need, as they are like a direct order to the user.

One For All also seems to alter the user's appearance in different ways. For All Might, it significantly enlarges his muscles and overall body mass to make him look like a completely different person, similar to a giant. For Izuku, usage of One For All causes the empowered part of his body to glow, with vein-like lines crossing through each other. His body also generates crackling, green energy that resembles lightning bolts when he activates One For All: Full Cowling. It is unknown what the usage appearance of One For All looked like for its previous handlers, however.

One For All can be duplicated, but since it is an accumulation-type Quirk, the amount of power given is practically insignificant; shown when Neito Monoma did not gain any substantial increase in power after copying it.

Weaknesses
When One For All is transferred, the new user's body is not naturally suited to it as they would be with a Quirk they were born with (ex. Someone who breathes fire doesn't burn their mouth while using their ability). In addition, One For All is a lot to handle; if ones' body can't handle the power, then their body could be blown apart. Because of this, the successor must undergo intense and rigorous training of the body.

After One For All is transferred, the previous user is left with only residual power of the Quirk (or "leftover embers"). While they would still be able to utilize the power to essentially the same degree as before, continuous usage of it will cause a strain on the user before ultimately, the wielder cannot make a tangible use of the Quirk at all. After All Might's final battle against All For One, his ability to sustain his Muscular Form was reduced to seconds, rending him unable to make any use of his residual power.

Assimilated Quirks
The Quirk factors of each of the previous users have merged with the core of One For All and have since increased in strength due to One For All's nature of stockpiling power. Izuku is the first user capable of accessing the Quirks of the previous users.

The Quirks within One For All are:


 * Danger Sense: The Quirk wielded by the fourth user. This Quirk allows the user to detect nearby threats.
 * Blackwhip: The Quirk wielded by the fifth user, Daigoro Banjo. This Quirk allows the user to create tendrils of dark energy from their body. These tendrils are good for long-range grappling and increasing the user's mobility.
 * Float: The Quirk wielded by the seventh user, Nana Shimura. This Quirk allows the user to levitate.
 * Three Unknown Quirks: Three unknown Quirks that originally belonged to the 2nd, 3rd, and 6th users of One For All.

Known Users and Usages
One For All has been bestowed to nine different hosts in total, starting with All For One's younger brother. Alongside the Quirk, its origins and the story between the two brothers have been passed on.

Because One For All can only be transferred willingly, it's presumed that each wielder had some form of personal connection with at least their corresponding predecessor and successor. Every host was entrusted, not only with the Quirk but also with the duty of using it to stop the evil of All For One.

All of the previous users of One For All seem to be aware of Izuku being the ninth holder of the Quirk. When All Might was researching the previous users of One for All, he was unable to find any information on the second and third users due to the multi-faceted nature of One For All and the era back then.

All For One's Younger Brother
The first user of One For All.

He was the younger brother of the powerful Villain, All For One. He was initially believed to not have a Quirk, but in reality, he had a Quirk with no other power than that it could be transferred to another person. One For All was formed from the fusion of his given Quirk and the power stockpiling Quirk All For One had forced upon him.

Though small and sickly, he had a strong sense of justice and did not back down from opposing his brother's evil deeds. The younger brother attempted to defeat his older brother with his newly-merged Quirk but didn't have the sufficient power to do so.

He then passed One For All down to an unknown successor, in the hopes that someone in the future would eventually stop his evil older brother once and for all, a cycle that continued to the present day. Even after his death, the brother is aware of Izuku being the ninth wielder of One For All and showed him the events leading to the creation of the Quirk.

The First's appearance is still relatively unknown. He is shown in the anime to be of similar height to All For One and, like his brother, possessed white hair. And later in the manga, around the time Tomura Shigaraki began his rise to power, there was a flashback sequence where All For One had given Tomura his name and when Tomura asked if his surname had any meaning ("Tomura" means to mourn) All For One simply stated that "Shigaraki" was his last name. This obviously concludes that the First's surname was "Shigaraki".

Second User
The second user of One For All.

Nothing is currently known about this person.

Their proficiency with One For All is unknown, as is their given Quirk.

Third User
The third user of One For All.

Nothing is currently known about this person.

Their proficiency with One For All is unknown, as is their given Quirk.

Fourth User
The fourth user of One For All.

Almost nothing is known about this man, but he appears to have two scars or markings on his left eye, going from around his right supraorbital ridge to his left lower lip. He also seems to have light-colored hair.

His proficiency with One For All is unknown, though he likely used it in conjunction with his given Quirk, Danger Sense.

For some reason, in All Might's notes about the previous One For All users, he has the information about him scribbled out.

Daigoro Banjo
The fifth user of One For All.

Daigoro was formerly known as the Pro Hero, Lariat. Described as being "super funky".

His proficiency with One For All is unknown, though he likely used it in conjunction with his given Quirk, Blackwhip.

He gave the Sixth user One For All by giving him some of his blood in the battle with All For One.

Sixth User
The Sixth user of One For All.

Next to nothing is known about the man who had One For All before Nana Shimura. The only thing known for sure is that the user was a man with dark hair who wore a high collared jacket.

His proficiency with One For All is unknown, as is his given Quirk.

He gave Nana Shimura One For All by giving her some of his hair in a battle with All For One.

Nana Shimura
The seventh user of One For All.

Nana was a very compassionate and noble individual. She is regarded as having been a truly great and exceptional Hero by incredibly powerful Heroes, such as All Might and Gran Torino.

Little is known about Nana's proficiency with One For All, other than she was not capable of bringing down All For One. She likely used One For All in conjunction with her given Quirk, Float.

Toshinori Yagi
The eighth user of One For All, and the first user who was born Quirkless.

Throughout his career, Toshinori was regarded as the most powerful hero of all time and remained undefeated. With the goal of being a pillar for society, he put One For All to great use, defeating all sorts of criminals, rescuing countless people from danger, and turning himself into a legend.

Toshinori, better known as the Pro Hero, All Might, is probably the best-known user of the Quirk, if not one of the most talented. Gran Torino once stated that Toshinori did not take long to adapt to One For All, having been blessed with an extremely resilient body, despite being born Quirkless. He was able to control and focus his power on any extremity he chose without recoil.

However, due to an untreatable wound that was inflicted on him by All For One in their first known encounter, he could only utilize his Quirk for three hours a day; any more and it would strain his body. Even if he was forced to employ One For All too much, the time limit for using his Quirk would shorten as a repercussion.

During his second battle with All For One during the League of Villains' hideout raid, Toshinori completely depleted all the "remaining embers" of One For All from his body in order to defeat the villain, essentially leaving him Quirkless once again. Although he can still transform for an instant, he cannot maintain his muscle form anymore as it causes great strain on his body, reverting back very quickly. Having retired himself from heroic activity thanks to this, Toshinori now dedicates himself to solely assisting Izuku in mastering the power of One For All so that he may become a great hero of his own.

He gave Izuku Midoriya One For All by giving him a strand of his hair.

Izuku Midoriya
The ninth user of One For All, and the second user who was born Quirkless.

Initially, Izuku had very little control over the Quirk and could only use One For All at 100% power, grievously injuring his own body each time, and only in short bursts at that. While this allowed him to unleash incredible displays of strength, it came at potentially lifelong physical costs, resulting in him currently having a visibly scarred, permanently crooked right hand and arm. This is because the training Izuku did prior to receiving the Quirk was only the bare minimum needed for using One For All without his limbs being blown off completely.

Later, Izuku found a way to minimize the damage to himself by focusing One For All's power into just his fingers. While he still ended up breaking his fingers, he was able to strike powerful blows and generate strong air currents.

Izuku likened the power to an egg exploding in a microwave; so to help him control the Quirk, he would envision an egg not exploding despite the pressure. During the U.A. Sports Festival, Toshinori estimated that Izuku could handle 5% of One For All full power without hurting himself.

During his internship with Gran Torino, Izuku was told by the elder Hero that his movements and attacks were too slow, as he treated One For All more like a special move rather than a natural ability. While training himself, Izuku attempted regulating the Quirk's power back and forth into his legs and arms in order to scale the side of a building. Unfortunately, he discovered that Gran Torino's previous evaluation was correct, and failed to do so.

Izuku eventually realized that he was using One For All solely in the limbs that required it in that instant, thus severely slowing down his overall reaction time and adaptability. To correct this, Izuku developed One For All: Full Cowl, which takes advantage of the 5% that Izuku can safely work with to increase his overall strength and agility by letting this small amount permeate his entire body.

Using Full Cowl, Izuku can easily scale the side of buildings, jump large clearings between structures, and quickly navigate through cluttered areas. Many of his newfound movements are attributed to watching the way Katsuki Bakugo propels himself using his Explosion Quirk. Izuku could react to the speed of Gran Torino and even held his own against Stain in his first real fight. Even so, if Izuku does not remain aware and in control while using his Quirk, he might go over his five percent limit and injure himself.

By the time of his second fight with Katsuki, thanks to all the training he had done, Izuku instinctively found out how to wield One For All at 8% of it's full power without repercussions.

During his battle with Overhaul, Izuku discovered that he could use 20% of his full power for a very short time if a desperate situation called for it, extended usage would cause him to damage himself. While in physical contact with Eri, Izuku was temporarily able to use One For All at 100% of it's full power with no consequences, due to Eri's reversing Quirk instantly neutralizing any damage Izuku was doing to his body.

Around the time of U.A.'s School Festival, Izuku, lamenting his inability to safely perform any long-ranged moves in the battle against Overhaul, was told by All Might that he already had the capacity to do so. His mentor had planned to wait until he had firm control of at least 15% of One For All before teaching him, but seeing that Izuku could briefly bring out 20% already, he decided to do so early. After learning the technique and receiving new equipment from Mei Hatsume to help harness the wind created, Izuku was able to put the super move to the test in his battle against Gentle Criminal.

During the fifth round of the joint training session between Class 1-A and 1-B, dark energy tendrils began to fire from Izuku's arm that heavily damaged his surroundings and pulled him along against his will. This state caused him intense pain and made him unable to deactivate One For All. With the efforts of Ochaco and Hitoshi, they were able to stop the rampage of One For All by brainwashing Izuku, but this sent him into his subconscious, where he met Daigoro Banjo, the fifth user of One For All. Daigoro explains that the Quirk factors of previous holders had merged with the core of One For All and increased in strength proportionally. Daigoro tells Izuku that there are five other Quirks that he will manifest, and that the Quirk he had when he was alive, Blackwhip, had just awoken within him.

After awakening from the dark world within himself and resuming the match, Izuku was able to consciously activate Blackwhip and control it to a degree. By calming his mind and looking back on the memories of his initial training with All Might for emotional support, Izuku was able to briefly activate and use Blackwhip with his own will, but quickly deactivated it due to the pain from his body not being strong enough to handle the enhanced Quirk, and decided that he won't be ready to use it until he fully masters the base form of One For All in the future.

After training with Blackwhip for a while, Izuku manages to bring it out to save cars from being destroyed, showing proficiency with the Quirk. Izuku also manages to increase his limit of One For All from 8% to 15%.

By the time of the Paranormal Liberation War Arc raid, Izuku's proficiency with One For All has increased to allow him to momentarily use 45% without breaking his body. His training with Endeavor and All Might has also increased Izuku's base limit of One For All to 30%. Later during his fight against Tomura Shigaraki, he unlocked Nana Shimura's Quirk: Float.And towards the end of the same conflict, he unlocked the Fourth user's quirk, Danger Sense.

Katsuki Bakugo
In a desperate attempt to stop Nine, Izuku decided to transfer the Quirk to Katsuki, allowing both of them to utilize the immense power granted by the Quirk.

Despite the period of transfer and possession being extremely brief, Katsuki demonstrated great proficiency with the Quirk. He was able to instantly use One For All: Full Cowl - 100% without any prior instruction, and his body was able to handle the sheer power of One For All without being blown apart.

When Katsuki used One For All to enhance his given Quirk, Explosion, it became so powerful, standard blasts from it could create enormous craters. The temperature of the explosions was also greatly increased, to the point where it could melt through solid rock in a similar manner to lava as Katsuki came into close proximity to it.

At the end of his and Izuku's fight against Nine, Katsuki lost One for All, and the Quirk remained in Izuku's body. Toshinori initially suspected that the Quirk stayed with Izuku because Katsuki lost consciousness prior to the transfer's completion, but later theorized that One For All kept itself inside of Izuku due to his willingness to protect others, even if it meant losing the power. This may mean that the transfer only let Katsuki borrow some of the power stockpiling energy from Izuku.

Izuku gave Katsuki One For All by swapping blood through the open wounds on their hands.

All Might's Super Moves
Most of the attacks used by All Might are based on the names of states and cities in the United States of America. Even the training schedule he made for Izuku Midoriya was named such.


 * California Smash (カリフォルニア スマッシュ): All Might's attack with a frontal somersault leading into a downward punch. This move was first used against a villain while he was studying abroad in the United States.
 * Carolina Smash (カロライナスマッシュ): All Might runs towards an enemy while keeping his hands in a cross position, then in a downwards cross chop to the enemy's head. This move is first used against Tomura Shigaraki, but it is intercepted by Nomu, who withstood the full force of the attack, seemingly unharmed.
 * Detroit Smash (デトロイトスマッシュ): All Might performs that same attack as Texas Smash except this move is with a downward punch instead of a straight punch. The punch is powerful enough to create a shock wave large and powerful enough to clear the weather. This move is first used to save Izuku and Katsuki Bakugo from the Sludge Villain.
 * Double Detroit Smash (ダブルデトロイトスマッシュ): All Might and Izuku use One For All at 100% and combine their Detroit Smash attacks to create a smash more powerful than anything they can accomplish alone. It was used to defeat Wolfram.
 * Missouri Smash (ミズーリースマッシュ): All Might runs towards an enemy while keeping his hand flat and hits the enemy on the head while running past them. This move is first used against Habit Headgear.
 * Nebraska Smash (ネブラスカスマッシュ): While throwing a punch, All Might rotates his arm to create a tornado. This move is first used to destroy a swarm of two hundred Mini-Bombers.
 * New Hampshire Smash (ニューハンプシャースマッシュ): All Might blasts himself towards his enemy and smashes his body into the enemy, crushing and injuring the enemy with his great weight. This move is first used to propel himself at Izuku.
 * Oklahoma Smash (オクラホマスマッシュ): All Might whirls around while enemies have latched onto him, spinning with enough force that when they are released they are easily thrown through concrete. This move is first used against Nomu however it was named during the Kamino ward incident.
 * Texas Smash (テキサススマッシュ): All Might throws a right punch with enough force that the wind pressure sends most things flying away. This move is first used to save Izuku from the Sludge Villain.
 * United States of Smash (ユナイテッド ステイツ オブ スマッシュ): All Might's final and strongest move. Using the last remnants of One For All left in him, All Might delivers a massive punch with enough force to reverberate shockwaves. This unstoppable attack was used to defeat All For One and marked the end of his hero career.

Izuku Midoriya's Super Moves

 * Detroit Smash (デトロイトスマッシュ): The same as All Might's move, except Izuku sometimes does it in the form of an uppercut, creating an air pressure blast.
 * Delaware Smash (デラウェアスマッシュ): Izuku flicks his finger to create a powerful shock wave. Doing this fractures said finger, limiting the number of times he can use this move without gravely injuring himself to 10 times.
 * One For All: Full Cowl (ワン・フォー・オール フルカウル): This technique allows Izuku to activate 5%, and later 8%, and then 10-15% of One For All throughout his body, letting the power course and flow through him instead of concentrating it in one location and negating the need to "turn on" the power every time he needs to use it. Activating this technique gives him enhanced strength, speed, mobility, and agility. It also prevents him from breaking his bones when attacking.
 * 5% Detroit Smash (5 パーセント デトロイトスマッシュ): Izuku activates One For All: Full Cowl, then jumps into the air and delivers an enhanced downward punch to the opponent. He has also used this move in the form of a straightforward punch.
 * Delaware Smash Air Force (デラウェアスマッシュエアフォース): Izuku uses his upgraded gloves to direct a blast of compressed air against his foe, possessing enough concussive force to stun Gentle while he was in mid-air, giving Izuku an opening to catch up to him. By using all five of his fingers, he can launch up to four Delaware Smashes simultaneously.
 * One For All: Full Cowl - Shoot Style (ワンフォーオールフルカウル シュートスタイル): A fighting style of using One For All that deviates from All Might. Izuku realizing that just imitating All Might's style which has its special moves centered on his fists was not the best style for him and was actually causing more harm to his arms, he developed a new style that centers more on his legs with the help of his friends. Shoot Style concentrates One For All: Full Cowl's effects in his torso and legs rather than his arms, allowing him to put out even more power due to the fact that the human leg muscles are naturally stronger than the human arm muscles, granting him more power and stability.
 * Shoot Style: St. Louis Smash (シュートスタイルセントルイススマッシュ): While using the Shoot Style, Izuku leaps into the air and before swinging around to deliver a roundhouse kick to the opponent's face. Izuku used this move to incapacitate Gentle Criminal, who had been empowered by La Brava's Lover Mode Quirk to match Izuku's use of One For All: Full Cowl at 8% of its power.
 * St. Louis Smash Air Force (セントルイス スマッシュエアフォース): While using the Shoot Style and 45% of One For All, Izuku arches his leg back and performs a strong vertical roundhouse kick, firing a large blast of compressed air. Izuku first used this technique to intercept a massive wave of crumbling debris created by Tomura Shigaraki's Decay Quirk.
 * One For All: Full Cowl - 100% (ワン・フォー・オール フルカウル 100): Izuku activates One For All to its fullest extent throughout Full Cowl, granting him a tremendous boost in speed and strength that allowed him to easily overwhelm the likes of Chisaki. This is first used against Kai Chisaki to protect Eri. The power increase seemingly gives him fire-like trails coming from his eyes and light-colored hair. He can only use it infinitely with no damage done to his body while in physical contact with Eri because her Quirk constantly rewinds his body to a previous state.
 * One For All 20%: A technique that allows Izuku to use 20% of One For All throughout his body, it causes a lot of pain to the point that he feels as if his bones are about to break.
 * Manchester Smash: While using 20% of One For All, Izuku leaps into the air and flips forward to bring down an axe kick upon his opponent. Although Chisaki managed to dodge it, it pulverized the ground thoroughly enough that Chisaki wasn't able to completely retaliate with his Overhaul Quirk.
 * One For All 30%: A technique that allows Izuku to use 30% of One For All throughout his right forearm. It was used in conjunction with Melissa Shield's Full Gauntlet, nullifying any normal drawbacks to using One For All at higher percentages. It is unknown how this percentage affects Izuku's body under normal conditions.
 * One For All 45%: A technique that allows Izuku to use 45% of One For All. He was able to utilize this level of One For All near the end of his first year of high school, during the war with the Paranormal Liberation Front.
 * One For All 100%: A technique that allows Izuku to attack using the full power of One For All in one concentrated part of his body. After initial use, the limb breaks instantly. He can still use expended limbs in combat, but it causes scarring once they're completely healed.
 * 100% Detroit Smash (100 パーセント デトロイトスマッシュ): While using 100% of One For All, Izuku strikes his target with a lunging punch.
 * 1,000,000% Delaware Detroit Smash (1000000 デラウェアデトロイトスマッシュ): Izuku activates 100% of One For All during an adrenaline rush and then strikes his opponent by first using a Delaware Smash and then a powerful Detroit Smash, hence the Delaware Detroit Smash. During the climax of his battle with Muscular, Izuku manages not only to overpower but also to launch his augmented opponent with enough force to create an impact crater in solid rock with the strike alone.
 * Wyoming Smash (ワイオミング スマッシュ): Izuku draws out 100 percent of his power into his arms, then proceeds to spike his opponent on the head, creating a powerful shockwave as a result. This technique was first used against Tomura Shigaraki during the war on the Paranormal Liberation Front.

Trivia

 * To date, most of the moves using One For All are named after states and cities in the USA (e.g. Missouri Smash, Delaware Smash). This is consistent with the manga artist's desire to model All Might after American comic book heroes, especially in All Might's hero form ( and ). It is unknown if like Izuku, the naming theme is passed from teacher to student, or if this unique to All Might with Izuku's admiration carrying over.
 * According to All Might, to activate One For All, the user must clench their buttocks and scream "SMASH!" within their heart.
 * So far, every named user has had a number in their name somehow correlating to what number of users they are.
 * Daigoro Banjo has a kanji in his given name that's homophonous to 5.
 * Nana Shimura's given name is a homophone to 7 in Japanese.
 * Toshinori Yagi has the kanji for 8 in his surname.
 * One of the kanji in Izuku's given name is homophonous to 9.
 * Katsuki's given name has a kanji that is homophonous to the nanori reading of 十 (10).
 * One For All's name is an inversion of All For One, showing the differing philosophies between their wielders. One For All showing "One Quirk for All people" (through passing it on from person to person) and All For One showing "All Quirks for One person" (through taking Quirks from others).
 * The names of both One For All and All For One are in reference to the phrase "One for all, all for one", a motto commonly associated with the titular characters of the novel The Three Musketeers by Alexandre Dumas.
 * Users of One For All manifest differently to the point where it defies regular classification. All Might transforms into a musclebound giant, which correlates to the Transformation Class. Deku's veins glow red could easily place him in the Emitter Class because the power of One For All starts coursing through his veins. Currently, it is unknown if the past and future users will manifest One For All and how it will be properly classed.
 * It is unknown if One For All can be passed back to a previous user if the current user allows it.
 * As the truth behind One For All is only known to a select few, Izuku's Quirk is listed as "Super-Power" in U.A. and other records.
 * According to Gran Torino and Toshinori, using One For All at 100% took far less time for Toshinori than most users and even Izuku.
 * Izuku states that One For All is "one of the seven great mysteries of the world". The other six "great mysteries" are unknown.

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