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"As Shirou was dragged into the hole left behind by the grail, the grail itself reaches out to him, acknowledging him as the true winner of the Fifth Holy Grail war. His wish of becoming a Hero is closer to being granted than he originally thought. Now in a world where being a Hero is a feasible profession, will he become a true ally of justice?"
—Summary from Fanfiction Dot Net.
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My Ideal Academia is an ongoing My Hero Academia and Fate/stay night crossover fanfic by Saraak. After Shirou's climactic battle with Gilgamesh at the end of Unlimited Blade Works, he, Archer, and Gilgamesh are all pulled into the Grail. As the victor of the Holy Grail War, the Grail acts to grant Shirou's wish of becoming a hero, and sends him to the world of My Hero Academia along with Archer, Gilgamesh, and Angra Mainyu. It also reduces Shirou's age so that he can attend UA.

Unmarked spoilers for the Unlimited Blade Works route of Fate/stay night below


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Tropes:

  • Absurdly Youthful Mother: Justified as the 22-year-old Yu Takeyama adopted the 17-turned-14-year-old Shirou. She's surprised by how well she takes to it, becoming more responsible, and is even invited to join a support group for single parents.
  • The Ace: When it comes to fighting, Shirou is considered the best fighter of all the first-year students. He is capable of reacting to and deflecting bullets from a machine gun, cracking a grown man's skull, and skillfully fighting at all ranges (short ranges with his swords, middle ranges with his floating swords, and long ranges by shooting his swords using his bow). He defeats a Nomu designed to beat the number one hero All-Might at USJ and defeats The Hero Killer Stain at Hosu. He wins in the one versus four sparring match against Midoriya, Iida, Uraraka, and Yaoyorozu without getting tired and only suffers minor damage. He goes toe to toe with the Beast. He is positively compared to the third-year students by his classmates. He has enough battle experience to train his classmates and cause the teachers to decide that he would fight a professional hero on his own in his examination, unlike his classmates, who needed to fight in pairs.
  • Adaptational Badass:
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    • Justified. Due to being taken down a peg by Shirou in the combat training and gaining experience from Shirou's training sessions, Yaoyorozu is much better than her canon counterpart, for example:
      • In canon, Yaoyorozu, Kaminari, and Jirou are at a villain's mercy when the villain holds Kaminari hostage until the professional heroes come and rescue them. In this fic, Yaoyorozu manages to create a plan to rescue Kaminari and knock the villain out.
      • In the first round of the final event at the U.A Sports festival, she wins against Tokoyami, while her canon counterpart loses and starts to lose self-confidence.
    • In canon, Aoyama only helps Uraraka restrain Thirteen's other hand, while Uraraka does all the hard work handcuffing Thirteen in their examination. In this fic, Aoyama fights Thirteen alone with the skill he gained from Shirou's training. He does an excellent job at it. Aoyama manages to catch Thirteen by surprise with his laser and disorient her, buying enough time for Uraraka to escape and earning Thirteen's praise. It's implied he would've shot another laser at the disoriented Thirteen, potentially winning the examination by knockout, if Uraraka hadn't escaped a few moments later.
  • Adaptational Job Change:
    • In canon, Fuyumi Todoroki's occupation is a teacher, but here, despite having an education degree and license, she is instead a waitress at Cafe d'Acier. Her attraction to Archer is implied to be the reason behind it.
    • In the canon timeline of MHA, Toya Setsuno is a member of Shie Hassaikai, but this time he was saved by Archer and given a job at his cafe to pay off his debt. Now he has a new lease on life with Undying Loyalty to Archer.
  • Adaptational Villainy: Backdraft is revealed to have done contemptable things such as intentionally starting fires and interfering with firefighters' ability to respond in order to break out into the Pro Hero scene due to the fact that his Quirk would've done nothing for him as firefighters were doing a good job that imitating them would just get him flak. Stain and Spinner learn this from torturing people he bribed or extorted in helping him and subsequently kill the corrupt hero.
  • All for Nothing: Many top heroes of Japan had gathered at Hosu to capture the elusive Hero Killer Stain. After the hard-fought battle against the unexpected League of Villains, they succeed in capturing Stain, only for Stain to be saved a few days later by the League of Villains.
  • Anger Born of Worry: Shirou tried to seek out and fight the Beast alone and suffered a serious injury. When he wakes up in the hospital, everyone is glad he survives but then get mad at him for his reckless action.
  • Animal Jingoism: Kenji, the dog-headed chief of the Musutafu police forces, and Ragdoll, the cat-themed professional hero, can't stand each other and start bickering when near each other. When Yu asks why, Aizawa says it's just a quarrel between a cat and a dog.
  • Anti-Climactic Unmasking: Shirou reveals his past to Yu... Offscreen. And has Archer confirm over a phone call. By the end of the chapter, she's pretty much over it. Fortunately, after some complaints from the readers, the author decides to rewrite the scene onscreen.
  • Arbitrary Skepticism: Angra Mainyu explains his origin story to All For One, but All For One thinks he is delusional. Angra asks why it is so hard to believe considering all the crazy, physics-defying Quirks in the world.
  • Arrested for Heroism:
    • Almost as soon as Shirou arrives, he sees a villain with a huge scorpion tail named Sasori Yarikaze attacking a woman. He saves her by taking Sasori out, but right after he does, Eraserhead and Midnight arrest him for vigilantism and excessive violence (in the MHA world, it is illegal to use powers to fight crime without a license). Yu "Mount Lady" Takeyama tries to point out that since the heroes were late, if Shirou hadn't interfered, the woman would be dead, but Eraserhead says that doesn't excuse Shirou from breaking the law. Since Shirou is a minor, instead of prison, he is put on probation in Yu Takeyama's custody.
    • Shirou gets arrested again when he tries to take on The Beast, violating both the law and his probation. He is told he will be sent to a juvenile correction facility, but Yu Takeyama saves him by officially adopting him and saying she will take responsibility for him, and gets him fitted with a tracking bracelet on his ankle.
  • Ascended Extra:
    • Yu "Mount Lady" Takeyama is given a much bigger role here, taking on the role of Shirou's guardian and adoptive mother, a role she takes to surprisingly well.
    • Unlike her canon counterpart, a minor background character whose only prominent role is in a team battle against class 1-A, Kodai has a more pronounced appearance here. She is Shirou's teammate in the training exercise and the second event of the U.A. Sports Festival. She has fleshed-out fights against Hatsume and Midoriya in the final event of the U.A. Sports Festival.
  • Bad Liar: Yu noted that Shirou is lousy at concealing information. When he tries to hide something from her, his voice trails off for a second and there is a slight twitch of his lip.
  • Be Careful What You Wish For: Downplayed; Bakugo demands that Shirou fight him with the spear that he used on the Nomu during the USJ incident, that is to say Gae Bolg, Bakugo actually has to fight from the instinctive fear the weapon causes, likening it to a rabid dog about to be unleashed from it's chain.
  • Beware the Nice Ones: Shirou is, as in Canon, incredibly polite and mild mannered. He also is capable of deflecting bullets with swords, cracking a grown man's skull, and defeating a Nomu designed to defeat All Might. Katsuki Bakugo learned this during their match in the Sports Festival when he pushed Shirou into projecting Gae Bolg.
  • Big Damn Heroes:
    • Shirou takes on The Beast and is losing. Mount Lady shows up in her giant form, crushes The Beast in her hand, and arrests him.
    • Kirishima, Shinso, Kendo, and Tetsutetsu are being chased by a sea of Black Blood Vanguards and a few Nomu. Then came Shirou raining down swords on the Nomus and the Black Blood Vanguards, saving them.
  • Bilingual Bonus: Archer's cafe is called Cafe d'Acier, French for Cafe of Steel.
  • Blessed with Suck: Sasori hates his scorpion's tail Quirk, since it only makes him look like a villain to the public, making it impossible to find a better job and create a better life. He considers self-mutilation but notes that it is impossible, since his tail is part of his spinal cord, meaning that if he cut it off, he would be paralyzed for life.
  • Bloody Murder: All For One grants Angra Mainyu a Quirk called Black Blood Vanguard. Any blood he spills turns into an army of mindless monsters under his control.
  • Boxing Lessons for Superman: Momo Yaoyorozu has mastered her Quirk, but after getting a harsh lesson that she doesn't know how to fight, she asks Shirou to train her.
  • Broke Your Arm Punching Out Cthulhu: Bakugo is implied to have done this in the final match of the Sports Festival because he was so freaked out by Gae Bolg, he let loose an explosion large enough to break his arms... And the arena.
  • Call-Back: Bakugo berates Monoma for being a copycat who can't train his Quirk and is only as strong as other person's Quirk. Having enough of it, Shirou quoted the same line he had used when he, the faker, fought against Gilgamesh, the original.
    Shirou: There's nothing that says that a fake can't surpass the original.
  • Chore Character Exploration: While washing the dish together with Yu, Shirou tells Yu his life from the very beginning, the Fuyuki Great Fire that started it all, the day he was adopted by Kiritsugu, the reason he wanted to become the ally of justice, the day before the Fifth Grail War, and of course Rin the girl that stole his heart.
  • Chronic Hero Syndrome: Shirou's extreme tendency for this heavily disturbs the pro heroes, and they're keeping a close eye on him until they can break him of it. it should be noted that his desire to be a hero is admired, but it's his lack of self-worth, called severe altruism here, that has everyone worried. Even Archer calls him out on it, saying that he's in a society where heroes are so prevalent that there are actually schools for it so why should Shirou think that everything depends solely on him?
  • Contrived Coincidence: Shirou designs his hero costume and sends a request for it to be made, but Yu Takeyama gets a hold of it and adds her own touches to it. When it arrives, Yu's changes make it look just like Archer's Servant outfit. Shirou is really annoyed by this.
  • Cover-Blowing Superpower: To pass his abilities off as a Quirk, Shirou only makes simple weapons with no special abilities. Since most Quirks are only one ability, he realizes if he makes complex Noble Phantasms or uses Reinforcement too much, that will raise a lot of questions. A few people still get suspicious because in the MHA world, nobody really practices or teaches swordsmanship or archery anymore, so they wonder how this kid is so skilled.
  • Culture Clash: A mild form of this occurs when Shirou first arrives in the MHA world, where his methods — which are comparatively soft by Nasuverse standards — are seen as extreme and borderline villainous.
  • Cynical Mentor: Archer reluctantly assumes this role in his interactions with Shirou.
  • A Day in the Limelight: In Chapter 43 - "Smelting the Sword (Part 1)", some of Class 1-A's examinations are given much more focus, showing their character development and skill, while Shirou's examination is Out of Focus.
  • Death by Adaptation: In canon, after the Hosu incident, Backdraft had participated in the Hospital raid against the League of Villains and survived Shigaraki's rampage. But here, he gets killed by Stain and Spinner, after the Hosu incident.
  • Does Not Know His Own Strength: Shirou defeats Sasori with an elbow strike that he assumes just knocked him out, but is informed the strike broke his skull and hospitalized him. Shirou realizes he got too used to fighting Servants who are many times stronger and tougher than humans.
  • Double-Meaning Title: The title of Chapter 22 - "The Sword and The Knife" has two meanings. First is the lie that Archer can only use knives, unlike Shirou, who can use swords. Second is Archer (the Sword), Shirou's experienced and stronger future self, who trains Shirou (the Knife), who is inexperienced and weak compared to his future self, to make Shirou strong enough to deal with Angra Mainyu.
  • Do Well, But Not Perfect: This is Shirou's mindset going into the UA Sports Festival, believing that there's no point in going all out in a situation where there's no cost/reward. He gets multiple telling offs for not considering his classmates feelings about the festival feeling that he's looking down on them by not giving it his all.
  • The Dreaded: Ironically enough, Shirou sort of fits this. Ashido Mina is rather upset that she has to fight him in the first round of the final stage of the Sports Festival, and everyone around her agrees that she's unlucky. The only others given this treatment are Todoroki and Bakugo.
  • "Eureka!" Moment: With how strong Angra Mainyu has become, Shirou needs a new way to train fast. When making soba noodles, Shirou reminisces about the time he spent with Rin and laments the only thing he has to remember her by in this world is Archer, the future self he loathes. Then he realizes he can ask Archer to train him even if both of them hate the idea.
  • Executive Meddling: In-Universe. The Hero Commission meddles in the U.A. practical exam by sending Endeavor as Shirou's proctor to investigate whether Shirou is a traitor or not.
  • Explain, Explain... Oh, Crap!: Shirou contemplates Angra Mainyu's arrival in this world, then suddenly realizes this means Archer and Gilgamesh are here too.
  • Firefighter Arsonist: Its revealed that the Firefighter-themed hero Backdraft has been secretly intentionally starting fires and then putting them out afterward to gain fame. Therefore, Spinner and the Hero Killer Stain decide to end his life.
  • Food Porn: In the earlier chapters, the author describes Shirou's cooking, the cooking process, and the other characters' reactions to it with many descriptive details. Some readers can't help but drool over it. The author admitted that they went overboard, with the descriptions taking up almost half of one of the chapters.
  • Forced into Evil: Sasori either serves the Shie Hassaikai as a bodyguard and kills their enemies with his poison, or else his daughter's simple and happy life with her foster family will be in danger.
  • For the Evulz: Angra Mainyu reveals to Stain that he himself doesn't have any special reason for joining and causing mayhem with the League of Villains, he just goes along for the ride.
  • For Want of a Nail:
    • When Gilgamesh snared Shirou's arm with his Enkidu chain to prevent himself from falling into the Grail, he then decided to snare a nearby tree when Shirou threatened to cut his own arm off. Gilgamesh accidentally snared Archer before he could shoot him, resulting in all three of them falling into the Grail and the Grail responding to Shirou's wish.
    • Due to Shirou saving her from Angra Mainyu, Uwabami writes a recommendation letter to U.A. for him. However, he refuses it. Since Uwabami has already written it and told her gals that she has recommended someone, she decides to find someone else to recommend. She finds Shinso, a teenager with the Mind Control Quirk who has been treated harshly by society due to his 'villainous' Quirk, and recommends him after he helps her capture some villains. Seeing that Shinso has a Quirk that can resolve situations peacefully but can't pass the heroes' entrance exam and that society misunderstands him, she tries to reform the heroes' entrance exam with the help of other heroes.
    • After fighting Shirou, knowing his ideals, and talking with Angra Mainyu about their ideals, Stain decides to join the League of Villains. This is unlike his canon self, who hates the idea of joining.
    • Due to uptick in Japanese villainy, the I-Island Expo is canceled, completely demolishing David Shield's plans, however, he is contracted by Nezu to help investigate how Eijiro's "Red Riot Unbreakable" is able to defend against Angra Mainyu's Black Blood. Melissa comes with him, transferring to U.A. in order to finish her education.
  • Fountain of Youth: Shirou arrives turned from 17 to about 14. He hates this because his body is smaller and weaker, his natural Magic Circuits are once again closed (in his first fight, he had to once again turn his nerves into Magic Circuits to do anything), and he has to go through puberty again.
  • The Gloves Come Off: After having enough of Bakugo berating him many times for not taking the U.A. Sports festival seriously, Shirou decides to let loose, brings out Gae Bolg and then quickly rushes Bakugo, giving him no chance to fight back.
  • Good Is Not Soft: Played with. Shirou is still used to the comparatively extreme measures necessary to deal with threats in the Nasuverse, so while he's soft by his old world's standards, he's not by his new one's standards.
  • Graceful Loser: Even though Bakugo hates the fact that he loses to Shirou in their rematch, he still acknowledges he is falling behind Shirou, so Bakugo decides to join in Shirou's training sessions to push himself.
  • Heroes Gone Fishing: Having already come to an understanding with Shirou and with nothing better to do, Archer opens a rather popular cafe.
  • Heroic BSoD: Oh... poor Kirishima, after getting hit with the Beast's Noble Phantasm point blank and infected with his blood, any times anyone mentions the Beast, he would go uncharacteristically silent. The mention of the Beast in Hosu city, the city he interned in, makes him have a nervous breakdown. Fortunately, he gets his bearing back in chapter 36 - "A Maddeningly Stained Sword", with the added bonus of unlocking "Unbreakable" earlier than canon and the ability to slowly regenerate himself.
  • Heroic Self-Deprecation: After being accused as a traitor by the public, separated from Shirou, and a patrol gone wrong, Yu wonders if she's worthy of being a hero.
  • Hidden Depths:
    • Yu Takeyama is given a much expanded role, where she is shown to be surprisingly responsible underneath her vain, attention-seeking persona. She initially adopts Shirou to keep him out of a juvenile correction center, but quickly grows to care for him as if he was her own.
    • It's shown in this fic that underneath her celebrity persona, Uwabami seriously cares about the future of the hero's society. Seeing the flaws in the heroes' education system (for example, discrimination against people with a "villainous" quirk), she decides to reform it with the help of other heroes to make Japan a safer place.
  • Hopeless Suitor: Kodai develops feelings for Shirou after he saves her during the entrance exam. However, her love is quite a hopeless endeavor since not only is Shirou oblivious to another person's love for him if it isn't a direct confession, but he also still loves and yearns for Rin after getting separated from her due to being sent to a different dimension.
  • Hormone-Addled Teenager: Downplayed. When he meets Mount Lady, Shirou notes that her boobs are much bigger than Sakura's. Realizing that thought is out of place for him, Shirou blames it on his body turning younger to the point that his young teenage hormones have returned that he thought about that.
  • Idiosyncratic Episode Naming: Each chapter is a phrase with the word sword in it.
  • Implicit Prison: After choosing to go to U.A, Shirou now must live and be monitored at all times there. While Nezu states it's would ensure Shirou's safety and Shirou still gets what he needs and is able to pursue his education at U.A, Shirou still likens his situation to a caged bird.
  • Innocently Insensitive: When Shirou's classmates compliment his new hero costume, they mean well. But they don't know that Shirou actually hates his costume and hates wearing it, because it looks a lot like Archer's Servant outfit.
    Kodai Yui: By the way, Emiya-san, [...] Nice costume. It suits you.
    Shirou tried to not let his agitation show.
  • Intelligible Unintelligible: Unlike most people, Recovery Girl completely understands Hound Dog's gibberish-sounded growls due to working with him for many years.
  • Internal Reveal: The night after the end of the U.A. Sports Festival, Shirou confesses to Yu that he is a 17-turned-14-year-old teenager who came to her world from a different world with different power systems.
  • Irony: Stain, whose goal is to rid of false Heroes that tainted true heroism, gets himself stained by All of Humanities Evil.
  • I Want My Beloved to Be Happy: Even though he is now financially stable enough to raise a child, Sasori won't stoop to taking his daughter from her foster family. He muses that she is much happier off having a simple life with them than with a scary, buff, scar-faced villain father who walks the thin line between the law and his poison, which is used by the Shie Hassaikai to kill off their enemies.
  • Jerkass Has a Point:
    • Even though Endeavor is a jerkass who belittles Archer's cafe establishment, he has a point that his daughter Fuyumi wasted her college education by working as a simple cafe worker in Archer's cafe.
    • Yoroi-Musha thinks very little of his junior Mt. Lady, and he tells her in no uncertain terms that he thinks Shirou is going to plateau and waste his potential by work-studying under her instead of him. He does, however, have a point. While Mt. Lady has the best intentions and is an effective hero in her own right, she completely lacks the skill set to further develop her adopted son. Played with in that Mt. Lady and Shirou aren't trying to train but instead kill Angra Mainyu using magecraft.
  • Knight Templar: Due to the difference between Fate/stay night and My Hero Academia standards on the Sliding Scale of Idealism vs. Cynicism, Shirou's methods of dealing with threats, while necessary in the Nasuverse, put him as this in the eyes of the pro heroes.
  • Lazy Alias: Archer goes by the name Farran in this new world. It was the first name he could come up with on the spot.
  • Leaning on the Fourth Wall: When Kodai hears Shirou saved her because she looked afraid, Kodai can't help but think that it's a lousy reason an anime protagonist would have to save anybody. Since Shirou is the protagonist of Fate/stay night, she is right.
  • Lethal Chef: Downplayed, as Yu admits that she has no cooking experience outside of instant meals. She will occasionally mix up sugar for salt, over-spice the dish or some other plausible mishap. Her cooking lessons under Shirou have been mitigating this but it's acknowledged that she's far and away from someone who can cook without the recipe near her.
  • Locked Out of the Loop: No one in the UA faculty told either Class 1-A or Class 1-B that their training camp would be bait for the League of Villains, potentially endangering them.
  • Logical Weakness: Hitoshi Shinso's Brainwashing Quirk only works if someone replies to his words. So when fighting against mindless monsters that can't talk like the Nomus or Black Blood Vanguards, he is really at a disadvantage due to his Quirk not working at all on them.
  • Malicious Slander: After Shirou ruined many of their plans, the League of Villains slanders his reputation by releasing information about Shirou and Angra Mainyu's likeness, making the public think Shirou is part of the League of Villains.
  • Mama Bear: Although it's only been a matter of months since Yu adopted Shirou, Yu has grown fond of Shirou and is quite protective of him. Case in point, when the League of Villains attack Shirou's class at USJ, she quickly rushes over and defeats several of them.
  • Meaningful Name: Shirou's hero name is the Unlimited Blade Hero, Sword. At first, Sword's name seems plain compared to his title and can be misleading (since he can create other weaponry, not swords only). However, it is a fitting hero name for Shirou since both his Origin and Element are Sword.
  • Mercy Kill: Discussed; Shirou tells Shoto that this is how he sees killing the Nomu at USJ. If Shirou had any other methods of undoing the Nomu transformation, he would have used it, unfortunately there is no way to do so and so Shirou killing the Nomu is basically him saving them from such a cruel fate by putting them out of their misery.
  • Mood Whiplash: After giving Shirou a passionate speech about why he chose Shirou as the rider of their team and why he respects and owes him so much, Shinso asks Shishida what he thinks. Getting no response, Shinsou asks Shirou to check on him. Shirou obliges, only to find that Shishida fell asleep while the countdown for the cavalry battle to begin started, surprising both of them.
  • Morton's Fork: After being accused of being a traitor by the hero society, Shirou must choose to either live and be monitored at U.A or remain at home with Yu while being monitored by officers coming for daily check-ins, private investigators, and the media. Either way, this limits his movements, making taking action against the League of Villains quite hard.
  • Mundane Utility:
    • The Reinforcement spell is so versatile at boosting the body. Not only does Shirou use it to reinforce his battle capabilities, but he also uses it to reinforce his brain to help him memorize and study faster.
    • To help with his cafe during rush hour, Archer convinces Setsuno to use his Larceny quirk, so he can grab something in the kitchen without needing to enter. It saved them a few precious seconds.
  • Named by Democracy: Angra Mainyu gets called The Beast by the media.
  • Never Be a Hero: Shota "Eraserhead" Aizawa tells Shirou that an "untrained" kid like himself playing vigilante only puts himself and the people he's trying to save in danger. He tells Shirou that until he can graduate a Hero school, the proper procedure when witnessing a crime is to call a Hero or the police.
  • Nigh-Invulnerable: After unlocking "Red Riot: Unbreakable", David Shield notes that Kirishima is able to defend himself against the Beast's Black Blood. Note, he isn't cured of the black blood and still needs to undergo surgury, it's just the defensive power of Unbreakable let's him ignore it.
  • No-Harm Requirement: Downplayed. When fighting against The Beast/Angra Mainyu, the pro heroes seriously have a hard time due to all damage they have done to him will be reflected back to them, but the damage done by undirect meansnote  can't be reflected back by him and he still can be restrained. It's still easier said than done though due to his Healing Factor, the massive power boost that he gains through possessing a Nomu body and his notorious fame.
  • Noodle Incident: During the time between his arrival to the MHA-verse and his eventual reunion with Shirou, Archer was involved in an incident that put Endeavor in debt with him. It involves him saving Fuyumi from something Endeavor couldn't. It's implied that this same incident is what caused her to be attracted to him.
  • Normal Fish in a Tiny Pond: Shirou, while no means a pushover, isn't high up on the totem pole in terms of threat level in his home universe. As this Shirou was barely at the final moments of the Fifth Grail War, he's, in fact, damn near the bottom. In the gentler world of MHA, however, he's far ahead of his peers, being positively compared to third year students while barely a first year.
  • Not Me This Time: When "the Beast" starts his murder spree, Hero Killer Stain quickly sends the police and Heroes a letter saying he's not the one doing this.
  • Oblivious to Love:
    • As if more evidence was needed that Archer and Shirou are the same person from different points in time, neither can see that Fuyumi Todoroki harbors a strong romantic attraction to the former. However, her younger brother Shoto does and is not happy.
    • Even funnier is that Kodai Yui, a student in Class B, also shows signs of having a crush on Shirou after he saves her during the entrance exam. Shirou, of course, knows nothing and is just confused.
  • Oh, Crap!:
    • Due to Shirou having a shit reputation with the public, Aizawa advised him not to fail nor defeat Endeavor in his practical exam but to run away, advice that Shirou agreed with. ...Only for Endeavor to seal the exit by melting buildings around it at the start of the exam, forcing Shirou to fight him head on.
    • To everyone's horror, Endeavor uses Prominence Burn, a pillar of flames that reaches the sky, against Shirou in his examination.
  • Only in It for the Money: Conversed, as in canon; Stain hates the current Hero society due to the fact that most heroes do not perform acts of heroism for its own sake, considering all other heroes besides All Might as fakes. Shirou on the other counters that as long as people are being saved, it doesn't matter what the motivation behind their acts are. Turns out that having this view and beating Stain is what pushed the latter into joining the League Of Villians.
  • O.O.C. Is Serious Business:
    • When Aizawa comes to the last meeting about Shirou's vigilante case, he sees Yu with a composed and determined expression. He notes how odd it is, since the carefree Yu would normally just passively and lazily listen to the meeting, and knows that Yu is up to something. His suspicion is increased when Kenji relieves her from her duty of watching Shirou, only for her to stay silent when she would usually be happy and relaxed after being freed from her task. Yu then reveals that she has adopted Shirou, surprising everyone in the room. After being alone with her, Aizawa asks her why she does this. Yu answers that she wants to save Shirou from getting sent to the correctional center and tries to help Shirou with her motherly love before he dies due to his altruism.
    • Kirishima, normally a boisterous Hot-Blooded hero in training, is noted to be subdued, quiet and almost brooding after his encounter with Angra Mainyu at USJ. It's implied that the latter's black blood is amplifying Kirishima's insecurities an nth degree.
    • Mineta, the resident pervert of class 1-A, always seeks a chance to peek at the girl's locker room or grope girls, even when the League of Villains attacked USJ. So when he refrains from doing so around Shirou after the rumor of the latter being a traitor, it was noted to be worrisome.
  • Orwellian Retcon: At first, the author wrote that Kodai's quirk allows her to shift her size like Mt. Lady. However, it's revealed later in canon that Kodai's quirk actually enables her to change the size of inanimate objects, not her body. Realizing the mistake, the author rewrote Kodai's scenes to be in line with her canon's quirk.
  • Parrying Bullets: When Momo Yaoyorozu tries to shoot Shirou with a machine gun loaded with rubber bullets, he charges at her while blocking the gunfire with his swords. The students think it is the coolest thing they have ever seen, but Aizawa thinks he is being stupid and suicidal, noting that some of the bullets went past his swords and hit him and thinking the only reason why he was able to keep charging was adrenaline. Of course, he doesn't know that Shirou was protecting his body with Reinforcement.
  • Play-Along Prisoner: Shirou is forced to stay put and be monitored 24/7 at UA due to being under suspicion of being a traitor. Shirou muses that he could just leave UA using his magecraft regardless of the law. But decided not to do it because his actions would also cause trouble for his adopted mother and their associate.
  • Playing Sick: After the match with Bakugo, Shirou wasn't injured or exhausted, but he had managed to pretend as if he were. So he doesn't need to fight against Todoroki in the finals of the UA Sports Festival.
  • Pop-Cultural Osmosis Failure: Shirou doesn't recognize images of the Cheshire Cat and a Poke Ball. Yu Takeyama is appalled by this.
  • Psychic Block Defense: Hitoshi Shinso tries to use his mind control Quirk on Shirou. Shirou is able to detect the mental intrusion and use his mana to block it. While not understanding how Shirou is immune, Hitoshi is impressed.
  • Pyrrhic Victory: Although the heroes managed to push back the League of Villains at Hosu, their victory can only be considered a pyrrhic victory at best. Before retreating, the League of Villains had defeated the top heroes of Japan with one villain, caused massive property damage, and infected many civilians with Angra Mainyu's blood, which made them violent.
  • Revealing Cover-Up: Yu suspects that Endeavor knows something about Archer/Farran because any information about the latter is being kept secret through the former's influence. Archer's interactions with Endeavor's daughter only adds more fuel to the fire.
  • Running Gag: Unlike most people who don't bat an eye on Toru's Invisibility Quirk, Shirou is baffled by and questions it every time he sees her.
  • Screw the Rules, I Have Connections!: Endeavor forced Nezu to let him participate in the practical exam against Shirou one on one by using his connection as the second-ranked hero of Japan to gain more information about Shirou and Archer forcibly from Shirou.
  • Screw the Rules, I Have Money!: Nezu laments that Endeavor can get away with destroying the surveillance cameras and the venue around the latter's fights against Shirou by paying for the damage later.
  • Secret Chaser:
    • Yu is very intent on learning Shirou's past and helping him through the issues that have made him so suicidally self-sacrificing. At the same time though, she wants to respect his boundaries and tries not to force the issue.
    • Since that day he saw Archer destroying a forested hill, Endeavor has been obsessed with uncovering his secret. So, when he notices Shirou has a resemblance to Archer, he uses his influence to dig up his past and forces Nezu to let him fight Shirou one on one, just to get closer to the truth.
  • Secret-Keeper: After Shirou earnestly spills his heart to her about his origin, Yu decides to keep his secret until she is six feet under.
  • Serial Killer: Angra Mainyu quickly becomes one when he arrives in the new world, for some reason mostly killing blond men and women.
  • Shadow Pin: In chapter 35 - A Stained Sword, Shirou used Black Keys against Stain by pinning his shadow to the ground.
  • Shipper on Deck: Realizing Kodai has feelings for Shirou, Kendo loves to constantly tease Kodai about it when near Shirou, much to Kodai's embarrassment. When Shirou leaves the viewing booth and misses Kodai's match, Kendo is the one who scolds him for it. However, Shirou doesn't notice it at all.
  • Shout-Out: Shirou and Yu go shopping at the clothing store called 'Soup' (clearly referencing the famous Soup store scene from Code MENT).
  • Silly Rabbit, Idealism Is for Kids!: Several characters, like Aizawa and several of his classmates, think that Shirou is stupid or crazy for wanting to save everyone and having no aspirations except for being a hero. Having already gone over this with people like Archer and Rin, Shirou tunes them out and says it is never wrong to help others.
  • Sliding Scale of Idealism vs. Cynicism: There's some initial friction after Shirou first arrives due to him still employing the methods he needed to use for the heavily cynical Nasuverse in the much more idealistic world of My Hero Academia.
  • Spanner in the Works:
    • League of Villain's plan had failed twice due to Shirou being an unforeseen variable. The first time in USJ, he defeated Nomu, their counter against All Might, and saved him from being Portal Cut. Then in Hosu, Shirou showed up and wounded Shigaraki, forcing them to retreat when they had the heroes on the rope. This angers Shigaraki so much that his first priority is to get rid of Shirou.
    • Stain ruins Shirou and Yu's plan of defeating Angra Mainyu in Hosu by triggering the bounded field specialized for traping Angra Mainyu inside due to ingesting his blood.
  • Stealth Hi/Bye: After revealing to Yu that her adopted son had shared a bed (read as had sex) with someone unlike her, Archer quickly vanishes, leaving behind the flustered and stunned Yu before she gets to interrogate him about it.
  • Steven Ulysses Perhero: Sasori Yarikaze (his given name means scorpion in English) has a scorpion tail for a Quirk.
  • Straight for the Commander: After seeing how much destruction the League of Villains have caused at Hosu. Shirou attacks their leader Shigaraki using Hrunting to force them to retreat before they cause more destruction to the hero society. Unfortunately, it makes Shirou Shigaraki's main target.
  • Supreme Chef: Shirou is this as per canon, much to Yu's delight. Archer is also shown to have retained his skills, opening a rapidly successful cafe.
  • Talking to Himself: Discussed In-Universe in Chapter 22 - The Sword and The Knife. Aizawa's colleagues drag him to Cafe d'Acier, where he challenges the skill of the owner, "Farran"/Archer. Since Aizawa and Archer are both voiced by Jun'ichi Suwabe, Aizawa's colleagues point out that their voices sound similar, to Aizawa's annoyance.
  • Tempting Fate: Shirou likes to tempt fate a little bit too much.
    • After training and teaching Yaoyorozu about close-quarters combat with a weapon, Shirou thinks about what next to focus on and believes there is no reason to rush since they have three years of hero courses to go through. The next day, the League of Villains attacks them at USJ, giving them a reason to quicken their training sessions.
    • After attending the meeting at the police station, Shirou considers his and Yu's plan to trap and kill Angra Mainyu would go well with the map details the police have given them, which would make narrowing down his location and laying down the traps easier. Unfortunately, Stain is the one that triggers the traps, while Angra Mainyu causes havoc elsewhere.
    • After Aizawa gives him sound advice to run away from Endeavor in his practical exam, Shirou muses why he himself thinks the practical exam would be a problem...and then Endeavor cuts off the escape routes.
  • There Are No Therapists: Double subverted. While the idea of forcing Shirou to go to therapy is considered, ultimately it is decided that he's too far gone for that to be of any help.
  • Tracking Device: As a condition to avoid juvie time, Shirou gets a tracking bracelet on his ankle so the authorities always know where he is.
  • Training from Hell: What Shirou’s classmates think he went through to get his skills. It doesn’t help that he told them that his training consisted of being “beaten with a shinai until [he] couldn't move”. What they are missing is that he can absorb the skills of the wielders of the weapons he copies, so this is actually an effective method for him. Unfortunately, it's the only method he knows, and he used it to teach Yaoyorozu how to use a spear, which gave her a weak foundation when she went to work study with Yoroi-Musha, who started to actually train her properly.
    Momo Yaoyorozu: Which certainly helped me earlier today. Before Yoroi-Musha even attempted to train me, he made me spar with him.
    Kyoka Jirou: That's brutal. Was it anything like Emiya?
    Momo: He was certainly much kinder than Emiya was. Apparently smacking each other with Shinai until your body learns how to adapt is a, and I quote, reckless way to train.
  • Unskilled, but Strong: Momo Yaoyorozu comments that she basically has a superior version of Shirou's ability. Shirou can only make bladed weapons while she can make anything, including firearms and bombs. She says if they fought each other she would easily win, but Aizawa disagrees. She doesn't know how to fight and has no battlefield experience, while Shirou clearly does, so Aizawa says Shirou would win. Sure enough, when they face each other in a training exercise, Momo tries to keep him at bay with a machine gun (with rubber bullets) and flashbang grenades, but he easily parries them and gets into melee range. She then makes a taser and a spear, but he effortlessly dodges or parries her with a wooden sword while lecturing her on the flaws in her technique before knocking her out.
  • Villain Respect:
    • Zig-Zagged. The Hero Killer Stain deemed Shirou as someone more worthy to become a hero than any other due to Shirou's conviction to save anyone until his last breath, but also considered him unworthy as a hero because Shirou would save anyone, including false heroes and villains, without a care in the world.
    • While fighting Mount Lady and seeing how hard she fights to protect and give Shirou time to find a way to defeat him, the Hero Killer Stain deems her a worthy hero.
  • Villain Team-Up: Shortly after Angra Mainyu is arrested, Kurogiri breaks him out and he is recruited into the League of Villains.
  • Wacky Parent, Serious Child: Basically the dynamic between the carefree Yu and the serious Shirou, usually with the latter berating the former for her antics. Like the time when Yu tries to joke around in the Hosu's meeting, only to tense up when Shirou gives her a glare.
  • Weak, but Skilled: Compared to Yaoyorozu, Shirou's abilities seem pretty lackluster: only able to make melee weapons, while Yaoyorozu can make just about anything as long as she has lipids and the knowledge of what it's made of. However, the fact that he knows how to actually use that which he creates (not to mention having the experience necessary to make sound decisions in the heat of battle) gives him an edge whenever they fight. Then again, unlike Yaoyorozu, some of the things Shirou can create are supernatural in nature.
  • Webcomic Time: Lampshaded. After his fight against Yaoyorozu in the second round, Shirou admits that the U.A. sports festival felt like it was lasting forever for a one-day tournament, and it hasn't been a day. Since it has been a year or more since the author started writing about the Sports Festival arc up to this point, that statement is true.
  • Willfully Weak:
    • Unless it's a life or death situation, Shirou only creates simple dulled weaponry, but doesn't use his other magecraft such as reinforcing his own body and weaponry, launching weaponry like a bullet, and using his destructive Noble Phantasms. However, after getting a pep talk from Yu, Shirou decides to use more of his magecraft, but still only uses Noble Phantasms in dire situations.
    • Angra Mainyu can easily defeat the eight heroes fighting him at Hosu, but decides to hold back and wait until the news helicopters arrive so that they can broadcast his absolute beating of the heroes to the public to show how serious a threat the League of Villains are.
  • With Great Power Comes Great Insanity: After being overwhelmed by All of the World's Evil, Stain gets a power boost akin to a lower-end Servant while losing all of his rationality. He's durable enough to tank a spike that smashed him through a rooftop and a stomp that shattered the road below from Mt Lady. And strong enough to lift her feet to escape. He's also howling like a mad man and biting down Shirou like an animal.
  • The Worf Effect: Invoked In-Universe by League of Villains. Angra Mainyu easily defeated 7 professional heroes, including the eighth and second-ranked heroes on live television, to prove how fragile hero society is and how dangerous they are. It's almost a big success until All Might comes to the rescue.
  • Worf Had the Flu:
    • Shirou remembers all his fighting skills and magecraft, but is hindered by his smaller body and his underdeveloped muscles and Magic Circuits. He has to slowly learn how to reopen his Magic Circuits. He muses that if he had his older body, he would have defeated Angra Mainyu with ease.
    • Archer is undoubtedly stronger than Angra Mainyu, but due to being severely low on mana after his battle with Shirou and not gaining mana anymore, and only keeping alive due to His Independent Action. He can only help Shirou and Yu defeat Angra Mainyu by training Shirou and giving them tips and tricks to make Bounded Field rather than hunting Angra Mainyu alone. In Chapter 39 - A Sword with Fire and Ice he started to slowly fade away.
  • The World Is Not Ready: One of many reasons why Shirou doesn't show the full extent of his magecraft to the public is because he muses that even there will be a time when his ability is considered normal (because of Quirk Singularity theory that dictates quirks will be much powerful each passing generation), the time wasn't now. A random boy with the ability to level cities would cause worry to any society.
  • Year Outside, Hour Inside: While not sure how much, Archer and Shirou speculate that the MHA world's times (the world they are stuck in) are much slower than their original world. Shirou guesses that a second could pass in the MHA world while two pass in their world, a minute could pass while a day passes in their world, or even a second in the MHA world is the same as a year in their world.
  • You Remind Me of X:
    • Yu Takeyama's ditziness and inability to cook or clean reminds Shirou of Taiga Fujimura.
    • Shirou's altruism reminds Recovery Girl of All Might.
    • Tenya Iida's glasses and uptight personality reminds Shirou of Issei Ryuudou.
    • Rikido Sato's Sugar Rush quirk reminds Shirou of Berserker's Madness Enchantment, complete with enchanting the body while weakening the sanity.
    • All Might's charisma reminds Shirou of Saber.
    • Monoma's inferiority complex and one-sided rivalry with Class 1-A reminds Shirou of Shinji.
    • Yu Takeyama's mannerism and action also reminds Archer of Taiga Fujimura, both of them are loud and headstrong woman.

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