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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.

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.

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


Tropes:

  • Absurdly Youthful Mother: Justified as the 22-year-old Yu Takeyama adopted the 17-in-a-14-year-old Shirou. She's is surprised by how well she takes to it, becoming more responsible and even joining a support group for single parents.
  • 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.
  • 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.
  • 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:
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    • 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.
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  • 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.
  • 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.
  • Bilingual Bonus: Archer's cafe is called Cafe d'Acier, French for Cafe of Steel.
  • 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.
  • 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.
  • 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.
  • 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 an 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.
  • Explain, Explain... Oh, Crap!: Shirou contemplates Angra Mainyu's arrival in this world, then suddenly realizes this means Archer and Gilgamesh are here too.
  • 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.
  • 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.
  • 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 decidedly not by his new one's.
  • 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, he suffers this after he gets curb stomp by The Beast / Angra Mainyu and getting infected by his blood. The mention of USJ Incident makes him silent and the mention of The Beast in Hosu, the city he intership in, makes him nearly having a nervous breakdown. Fortunately he gets his guts back by releasing his inner Bakugo and scream to himself for being a coward that running away while his friends fighting for their lives, with the added bonus of unlocking "Unbreakable" earlier than canon and his quirk now can regenerate slowly but surely.
  • 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.
  • Idiosyncratic Episode Naming: Each chapter is a phrase with the word sword in it.
  • Implicit Prison: After it revealed that Shirou and The Beast/Angra Mainyu have the same face to the public and also the fact both of them appeared at the same time. Shirou is forced to either live in UA and to being monitored by the staff or remain home with Yu Takeyama while still being monitored by officers coming for daily check-ins, private investigators from concerned parties, and the media. This hinders his plan and makes Shirou stays put, until Nezu has finished his investigations of the connection between Shirou with The Beast/Angra Mainyu .
  • 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.
  • Jerkass Has a Point: 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.
  • 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.
  • Malicious Slander: Shirou is accused of being a traitor to the hero society, due to him having the same face as Angra Mainyu and appears at the same time as him too. It's implied that Angra Mainyu and The League of Villains are the one who circulating that information to give Shirou and his adoptive mother a bad rep.
  • 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.
  • 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.
  • No-Harm Requirement: Zig-zagged. When fighting against The Beast/Angra Mainyu, the pro heroes seriously have a hard time due to all damage they 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, and 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.
  • 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.
  • 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.
  • OOC Is Serious Business: Despite having a perfect chance to peek at the girls in the locker room, Mineta the resident pervert of class 1-A doesn't do it, due to being around Shirou. It can't be helped for Mineta to be wary of Shirou, with the rumors surrounded him.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Straight for the Commander: After seeing how much destruction the league of villains have caused at Hosu. Shirou attacks Shigaraki using Hrunting to force them to retreat before they cause more destruction to the hero society. Unfortunately, it makes Shirou being 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 Junichi Suwabe, Aizawa's colleagues point out that their voices sound similar, to Aizawa's annoyance.
  • 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 Team-Up: Shortly after Angra Mainyu is arrested, Kurogiri breaks him out and he is recruited into the League of Villains.
  • 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.
  • 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.
  • 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.
    • All Might's charisma reminds Shirou of Saber.
    • Monoma's inferiority complex and one-sided rivalry with Class 1-A reminds Shirou of Shinji.

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