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Fanfic / One Hundred Percent Hero

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A boy born with all the power he never wanted, Shigeo Kageyama didn't view himself as a hero. Although he saved innocent people from villains and spirits countless times, he never thought about how many lives he saved. But when he goes to a world where people with powers save others regularly, he will come to realize the impact he could have and what it really means to be a hero.

100 Percent Hero is an ongoing Mob Psycho 100/My Hero Academia Fusion Fic written by CiscoTheSoto. The premise follows Shigeo Kageyama, the protagonist of MP100 who ends up trapped in a dimension that revolves around heroism after his climactic showdown with Touichirou Suzuki. Under the guidance of Toshinori Yagi, Japan's Number 1 Hero and his new master, and Izuku Midoriya, a hero fanboy and his new best friend, Mob decides to make the most of his situation by becoming a hero himself.

Compare Sure as the Setting Sun which follows a similar premise.


100 Percent Hero provides examples of:

  • Adaptational Early Appearance:
    • Dr. Kyudai Garaki makes an appearance early in the story as a loyal ally to All For One.
    • Hawks makes a live appearance during the Internship Arc as Mob and Tokoyami decide to intern under him.
    • Endeavor's sidekick Burnin makes a small cameo at the end of the Stain Arc.
    • Natsuo and Fuyumi Todoroki both appear before the start of the Final Exams Arc.
  • Adapted Out:
    • Word of God has revealed that Koji Koda was removed from the story so that Shigeo can have his spot in 1-A.
    • They also stated that Hatsume is no longer featured in the Sports Festival Arc claiming that they didn't know how to fit her in the new version of the story.
  • Adult Fear: Reigen and the Kageyamas can only wonder and worry over what became of Shigeo after the False King's invasion with the worst possibility being that he may never back.
  • Advertisement:
  • Armor-Piercing Question: All Might gives a positive one to Shigeo as a means of encouraging the boy to stand down from fighting Shigaraki's Nomu.
    All Might: Don't you have faith in me, Kageyama?
  • Ascended Extra:
    • Momo and Tokoyami have become more prominent characters in the story.
    • Kendo and Tetsutestu from Class 1-B have gotten more screentime too, especially after joining the new Body Improvement Club.
  • Bad "Bad Acting": Momo and Mob try to live up to their "villain" roles during the Battle Trial Arc which leaves alot to be desired.
  • Because You Were Nice to Me: To repay Toshinori's kindness for offering him a home and guidance while stuck in his new reality, Mob is motivated into becoming a hero that the Number One Hero can be proud of.
  • Beyond the Impossible:
    • All Might's power has been boasted as being so powerful that he could change the very weather itself if he wished to.
    • For the 1-A girls, Shigeo being able to reform Mineta by talking to him was a miracle that many of them thought was unobtainable.
  • Big Man on Campus: Shigeo is often regarded as the most popular boy in Yuuei thanks to not only his unmatchable psychic powers but for his heart of light and how he shares that light with everyone around him.
  • Black-and-White Morality: In the world of heroes, there is a strong line between heroes and villains with the former refusing to understand the latter, preferring to defeat them as quickly and magnificently as possible. It comes as a shock for both the past and present generations of heroes when Shigeo prefers to show kindness for the wicked and understand their motives rather then simply beating them. The fact that he manages to obtain results with his compassion astounds and baffles many of them.
    Tensei: To be able to actually talk to a villain, reach deep inside their hearts and bring out their humanity through just words, it's unreal. I was saying just seconds ago that the idea of a villain with such strong convictions changing their ways was impossible, and here you are telling me that's exactly what Kageyama did with Stain. I've never done anything remotely close to that with any villain.
  • Blood Brothers: Shigeo and Izuku's friendship can be seen as this as they both trained under All Might and supported one another before entering U.A., even getting to spend some days hanging out together. And after they were admitted, they continue to look out for one another as they forge their own paths in becoming heroes. They even think of each other as brothers after their reconciliation during the Forest Camp Training Arc.
  • Borrowed Catchphrase: After hearing Mob chant the Body Improvement Club's "Fight On!" motto and learning it's meaning, Izuku decides to use the chant to motivate him during All Might's training regiment. Later on, the new Body Improvement Club would use this chant throughout their workout routines.
  • Broken Ace: Mob's psychic powers are at a far greater level than the rest of his classmates and most pro heroes, not to mention he barely needed to train to get so strong. But he still holds himself back due to his traumatic experiences in using his psychic powers to the fullest.
  • Broken Aesop: Discussed In-Universe. While talking with Toshinori about how Stain was motivated to inspire change in hero society but failed to do so, Shigeo questions if his philosophies about not thinking highly of quirks are able to get through to his peers because he's already considered the fairest of them all. His adopted father somberly remarks that those with great power have a higher chance of having their beliefs known and accepted to the world compared to those with little to no power.
  • Bullying a Dragon: During the Entrance Exam, several participants openly make unflattering comments about Shigeo due to his plain appearance and brush him off as a hopeless loser. They immediately regret their words when the esper uses his powers to instantly destroy several robots without breaking a sweat.
  • Call-Back:
    • After his stellar performance with the ball toss test, Shigeo remembers his conversation with Dimple who explained that he was able to defeat Shibata after possessing Goda Musashi and using his hard-earned muscles which enhanced his powers.
    • In the USJ Attack Arc, Shigeo finds himself pressured to fight against a dangerous group of villains but is presented with the option of allowing his master to fight on his behalf. Just like with Reigen at the 7th Division, Shigeo steps aside to let the adult fight but does so after blessing All Might with his powers.
    • In Chapter 29, Shigeo offers the same advice he was taught towards Mineta.
    Mob: "My master taught me that the truth behind one's charm was just being a good person. So that's all you need to do: work hard towards improving yourself, become better."
    • During the Forest Camp Training Arc, Pixie-Bob getting upset at Izuku for bringing up her true age reminds Mob of his encounter with Tsuchiya.
  • Can't Catch Up: One of the downsides for Shigeo's existence as the greatest hero hopeful of his generation is that many of his classmates can't help but feel insecure about their own talents and whether they can even catch up to someone as powerful as him. It also doesn't help that they show more signs of struggle when training while Mob is able to learn and adapt with minimal difficulty.
  • Central Theme: The main theme of this story is the stark contrast between the overarching messages of My Hero Academia and Mob Psycho 100. While My Hero Academia revolves around pushing your abilities to the limits and accepting your powers to reach your dreams, Mob Psycho 100 emphasizes not placing value solely on a person's quirks and instead focusing on improving as a person. This is even highlighted when Tsuyu compares the protagonists of the two shows to her friends.
    Tsuyu: Bottom-line, I think the main difference between Midoriya and Kageyama is that Midoriya inspires us to become stronger, but Kageyama inspires us to be better.
  • Curb-Stomp Battle: The Battle between Shigeo and the First Nomu.
  • Demoted to Extra: The support cast of Mob Psycho 100 have little to no significant involvement in the story. Justified since Mob was transported into the MHA dimension and neither he nor his friends have any way of making a connection.
  • Didn't Think This Through:
    • Shigeo realizes this when he gets too carried away with instilling the fear of God into Bakugou in Chapter 11, completely forgetting that there can be consequences for willingly harming another student.
    • This happens again during the Stain Arc where he uses all of his energy during 100 % Desperation to fly straight to Hosu in order to reach Iida. This backfires on him as it leaves him too weak to fully use his powers and it makes him more vulnerable to the Hero Killer in direct confrontation.
  • Downer Ending: The conclusion of the Sports Festival Arc can be seen as this. After Shouto encourages, and even forces, Shigeo to unleash his full powers, he stops in the last second when he realizes that he's getting carried away and can potentially hurt his classmate and the spectators. This gives Shouto a chance at knocking him out and winning the tournament. It's a loss for the two boys as the esper felt ashamed for losing control and for not winning first place like he promised All Might and the dual quirk user didn't feel satisfied with his victory when he sees how Shigeo reacted in the end.
  • Energy Donation: Shigeo still maintains the ability to transfer his energy to others to heal them or enhance their own powers. This is best shown during the U.S.J. attack where he gives his energy to All Might which improves his strength and allows him to maintain his hero form for a longer period of time. The only side effect is that Toshinori also feels the same rage emotion that Mob was feeling during the Attack, meaning that he needed to be careful not to let his rage control him.
  • "Eureka!" Moment: Shigeo gets one while talking with Recovery Girl about how her quirk involves sending signals to the body to heal. He realizes that his Green Thumb and Energy Donation powers also involve sending signals and can potentially heal people like her.
  • First-Name Basis: As of Chapter 35, Shigeo and Izuku are close enough to refer to each other by their first names. Izuku even calls him "Shige".
  • For Want of a Nail: Due to Shigeo's drastic appearance in the world of heroes along with his miraculous powers, All For One and Shigaraki have turned their attention to the esper, rather than on Bakugou, to dispose of him on their own terms.
  • Gone Horribly Right: In the final round of the sports tournament, Shouto manages to push Shigeo into unleashing his full powers so neither of them can hold back with giving it their best. To his surprise, and horror, Shigeo decides to push his powers to the max that he starts to have a Laughing Mad fit while almost harming him and the spectators. The esper manages to stop himself when he sees how much damage he's causing with his powers.
  • The Greatest Story Never Told: Invoked at the end of the Stain Arc. The Arc ended with Mob managing to convince the titular villain to have a genuine change of heart and repent for his crimes. However, as the Chief of Police points out, revealing such a story would be difficult for the public to accept given how dedicated Stain was to killing unworthy heroes. Not to mention that Mob and his friends did disobey their hero mentors to fight him which would result in disciplinary action for the students and mentors. To keep things from getting messy or confusing, the Chief decides to cover up the truth by having Hawks be the one to defeat him.
  • Handicapped Badass: Invoked during the Final Exams Arc. In order to keep the fights for two three-person teams fairer against their teachers, one member from each team (Shigeo and Tsuyu) is required to wear heavy weights throughout the exam making it harder for them to move and use their powers. All Might himself uses the same weights so he can give his opponents a reasonable chance at beating him.
  • Happily Adopted: Toshinori becomes a third father figurenote  to Shigeo as he allows the boy to stay in his apartment during his stay in the world of heroes. The young esper is grateful for his hospitality and his role as a parental figure.
  • Homeschooled Kids: Before enrolling at U.A., Shigeo finishes the rest of his middle school education via online learning.
  • In Spite of a Nail: Despite Shigeo's radical appearance and influence, the timeline follows through with the same major events as in the original MHA series.
  • Irony:
    • Toshinori is amazed to learn that Shigeo considers himself to be a loser in his home dimension despite having phenomenal psychic powers as the hero's dimension would rank him as one of the most popular kids because of his raw power.
    • While talking with his boys about One For All's origins, Toshinori notes the irony of a quirk that has been used for good originating from evil itself.
    • In the Stain Arc, the titular villain declares that it's impossible for someone to change their true nature in only a few minutes. Stain would end up changing his own nature after living through Shigeo's memories which lasted a few minutes in the real world.
    • In Chapter 34, Mineta openly declares that he won't be the class pervert anymore.
  • Japanese School Club: In Chapter 22, Kirishima encourages Shigeo to recreate the Body Improvement Club so they can get physically stronger and support one another. Shigeo agrees to the idea and they manage to get ongoing members. Although it's considered an unofficial club as the hero course doesn't allow school clubs to be made.
  • Laser-Guided Karma: During the Entrance Exam, Shigeo takes the time to help his fellow participants earn villain points after he himself won sufficient points and was worried that the other kids wouldn't get decent scores. Nezu and the faculty catch on to his noble efforts and reward him with hero points that grants him the highest score of all.
  • Late-Arrival Spoiler: The fanfic features characters and spoilers that are already shown in both manga series.
  • Meaningful Echo: In Chapter 25, a changed man recites a similar phrase that was once said by Keiji Mogami towards Mob.
    Mogami: You will be invincible, Shigeo Kageyama.
    Stain: You are INVINCIBLE, Shigeo Kageyama.
  • Messianic Archetype: Shigeo's involvement in the lives of the MHA cast gives him the impression of a messiah figure. His powers are remarkable and has been compared to being as strong as All Might himself. Yet he maintains a humble nature as he encourages others not to focus solely on their quirks/powers but on how they can support and be kind to one another. He also performs impossible miracles that most people could only dream of accomplishing, such as convincing the Hero Killer Stain to see the errors of his way or healing Todoroki's scar and Iida's paralyzed brother.
  • Mood Whiplash:
    • During the All Girls' Slumber Party in Chapter 34, the girls are in utter delight when Momo discusses how kind-hearted Shigeo was to her during her moment of weakness. But the mood turns serious when Jirou brings up how the esper showed a similar kindness towards Shigaraki despite being held hostage at the mall. The girls find it difficult to continue any light-hearted discussions after learning how far Shigeo is willing to extend his goodwill.
    • While Mob and Momo are nervous, but excited, to be paired up during the Pussycats' night time activity, their happiness is cut short when they discover that a toxic fume is flooding the forest and Mandalay announces that villains are attacking the camp.
  • My God, What Have I Done?:
    • Mob gets hit with regret when he learns that the Sludge villain escaped from All Might due to Mob's explosion of 100% Confusion.
    • This happens again during the final round of the Sports Festival Arc where he almost gives in to 99% Ecstasy and remembered the last time he gave in to such a horrible emotion.
  • My Greatest Failure: Back in Seasoning City, Reigen, Ritsu and Teruki blame themselves for being unable to help Mob during that fateful day.
  • Mythology Gag:
    • Shigeo ends up developing a crush on Momo, who shares alot of similarities to his first crush Tsubomi.
    • The esper unleashes 100% Animosity towards Bakugou for his horrid mistreatment of Izuku; he used this same explosion when Megumu attacked his beloved brother.
    • While talking with Izuku about OFA, Toshinori suggests that Shigeo could be an actual god if he blessed the esper with One For All instead of Izuku.
    • During the final round of the Tournament Arc, the young psychic unleashes an explosion of Ecstasy after Shouto encourages him to embrace the fight. But he soon realizes his mistakes and his emotion turns to Shame.
    • Shigeo reuses his old nickname when the class picks out their official hero names. He is now known as the 100 Percent Hero: Mob Psychic or Mob for short.
  • No-Sell: To Bakugou's horror, none of his attacks have any effect on Shigeo when the young esper gets serious and elevates his powers using 100 % Animosity or Disappointment.
  • Not Quite Dead: Touichirou declares to the heroes that he doesn't believe that Mob died as he could still feel his presence remaining in tact during the explosion but not perishing. That said, even he doesn't know what became of the child.
  • Nothing Is the Same Anymore:
    • In Chapter 25, Stain is convinced by Shigeo to give up his sadistic mission and turn over a new leaf.
    • In the next chapter, Endeavor gets an early start on his Character Development and begins to atone for his abusive past.
    • In Chapter 28, Mob manages to heal Todoroki's iconic scar.
    • In the following chapter, he undoes Tensei Iida's paralysis which allows him to resume his hero career.
    • In Chapter 34, Mineta renounces his perverted behavior and vows to be more respectful towards all women.
  • Oh, Crap!: All Might has this reaction as he hears Mob explain how he fought against a villain who was the leader of a sinister organization and had the power to grant or steal any power at his will. The noble-hearted blonde was concerned that the boy had to face off against his dreaded nemesis All For One without his knowing.
  • Passing the Torch:
    • Along with Izuku who has proven himself worthy of inheriting One For All, Toshinori also considers Shigeo to be an equal successor due to his experience in defeating villains mixed with his heart of light. When he reveals to them about the origins of his quirk along with his fearsome enemy All For One, he declares that both of them shall take his place as the new Symbols of Peace.
    • After being convinced by Shigeo to change his life for the better, Stain decides to assign the esper with his mission of inspiring meaningful change in hero society in the hope that false heroes can see the errors of their ways.
  • Recap Episode: Chapter 25 can be seen as this as it features Shigeo transmitting his memories and past experiences for Stain to live through to understand his ideology of change.
  • Secret-Keeper:
    • Shigeo becomes this for Toshinori and Izuku regarding their respective secrets. From the former, he learns about his true form along with the exact nature of his quirk One for All; for the latter, he learns that Izuku was quirkless and became the new inheritor of OFA.
    • Naomasa and Nezu become this in regards to Shigeo's predicament. After Toshi explains to them about his incredible powers and how he isn't from their world, the two agree to do their part to help Shigeo take part in U.A. and create a legal identity for him without drawing suspicion. Recovery Girl and Aizawa would join in on his secret after the disastrous events of the U.S.J. Attack.
    • The Todoroki and Iida families agree to keep Shigeo's healing miracles a secret so the esper wouldn't get unwanted attention from the public in regards to his true capabilities.
  • Ship Tease: There's been alot of tender moments between Mob and Momo.
  • Shipper on Deck: Mina and Hagakure are both invested in Momo getting together with Shigeo. And even Mineta provides an opportunity for the two to be together during a late night activity at the forest camp.
  • Shown Their Work: The author goes into exceptional detail when discussing the human anatomy and specific injuries that pertain to certain characters.
  • Slumber Party: The girls from Class 1-A and 1-B come together to have a slumber party during the Forest Camp Training Arc.
  • Something Completely Different: The second half of Chapter 28 focuses on Reigen, Ritsu, and Teruki as they try to continue moving forward with their lives while dealing with Mob's disappearance.
  • Spotlight-Stealing Squad: Along with replacing Izuku as the main protagonist, the story focuses more on Shigeo's relationships with his friends and the Pro Heroes he comes across.
  • The Stations of the Canon: The fanfic follows the same major events as the MHA series.
  • Stealing the Credit: This happens at the end of the Stain Arc. Even though it was Mob and friends who were able to defeat Stain, they disobeyed their superiors to act on their own which is illegal by hero society standards. To avoid creating a public discord by reprimanding the Pro Heroes for the actions of their interns, the police are willing to make it so that Hawks was one to stop Stain as he was the last hero to be with Stain who was defeated and properly restrained.
  • Super Power Lottery: Shigeo's psychic powers are treated as this since espers in his reality were never limited with the number of abilities they can learn and master. Class 1-A is in total awe over how versatile his psychic "quirk" can be when used in combat.
  • Swapped Roles: At the start of the training period, Shigeo was always the first to pass out while Izuku was able to endure much longer. But 10 months later, Shigeo is able to handle himself exceptionally well while Izuku ends up losing stamina due to overworking himself outside of training.
  • Sympathy for the Devil: Shigeo ends up feeling sympathy for his kidnapper Shigaraki when he explains his cruel origins and why he hates All Might. The bowl cut kid tells him that he understands where he's coming from and offers to listen to Shigaraki if he needs someone to talk to.
  • Take a Third Option:
    • During the USJ Attack Arc, Shigeo has two options: he could either continue to fight against Shigaraki and the Nomu or he can allow All Might to fight alone and risk being hurt. What does he do? He allows All Might to fight but not before using his psychic energy on the Number One Hero giving him a significant power boost.
    • For the Final Exam Arc, Shigeo, Izuku and Bakugou are in conflict as to how they should win their fight against All Might. While Izuku declares that they should run away and win, Bakugou is against working with them and wants to take on All Might himself. The group decides to go with Shigeo's idea of each of them taking turns fighting All Might in order to allow Bakugou a chance at handcuffing him which would grant them victory.
  • Teeth-Clenched Teamwork: For the Final Exam Arc, Shigeo and Izuku are paired up with Bakugou who hates the two of them and refuses to cooperate. Though it's subverted with the former two considering their friendship dynamic.
  • "The Reason You Suck" Speech: Shigeo gives a well deserved one to Bakugou in Chapter 11 claiming that the reason he mercilessly picks on Izuku and acts so high and mighty is because he's afraid of being seen as a weak loser. Especially if he were to lose to a quirkless nobody he constantly bullied.
  • This Cannot Be!: Bakugou gets this reaction when he realizes that Izuku managed to earn enough points to enter U.A. and how his friend Shigeo had beaten him in the scoreboard as the fairest of them all.
  • Time Dissonance: A passage in Chapter 28 states that the Mob Psycho dimension is 4 months behind the My Hero dimension.
  • Title Drop: When choosing their new hero names, Shigeo chooses the title The 100 Percent Hero.
  • Took a Level in Badass:
    • After going through 10 months of Toshinori's training, Shigeo's physical stamina has significantly improved and is now capable of performing workout routines without passing out. Additionally, the output of his psychic powers is much stronger thanks to strengthening his muscles.
    • Roughly a year after Shigeo's disappearance, Teruki and Ritsu have been training everyday to strengthen their psychic abilities and have been able to master new powers as a result. Word of God has stated that both of them could defeat Shigeo in his current base form if they were to fight him individually.
  • Trapped in Another World: The premise involves Shigeo being transported into another world with no way for him to return back.
  • Un-person: Inverted. Since Shigeo came from another reality, Toshinori asks of his upper level friends to create a legal identity for the boy to ensure that no one would be suspicious of his true origins.
  • Wins by Doing Absolutely Nothing: Shigeo and his team are able to win the Calvary Battle in the Sports Festival Arc by using his barriers to protect themselves from enemy teams. The barriers prove to be so powerful that none of the teams are able to steal Shigeo's million point headband.
  • Year Inside, Hour Outside: Stain ends up going through hours of Mob's memories when in real time only a few seconds pass.
  • You Are Better Than You Think You Are: Shigeo gives this speech to Momo in Chapter 30 when the brilliant girl expresses her insecurities about her worth as a hero. The boy reminds her of her many accomplishments throughout their academia and assures her that she is a one-of-a-kind person who has so much to offer.
  • You Can't Go Home Again: Despite Toshinori's and Nezu's best efforts, there hasn't been any luck in finding a way to transport Mob back to the MP100 dimension which diminishes his hope of returning home.
  • You Remind Me of X: The friends and characters that Shigeo interacts with often remind him of his own friends and figures in his home reality.


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