Izuku Doofenschmirtz is a crossover fanfiction between My Hero Academia and Phineas and Ferb (primarily focused on the MHA side) by undead frog. It can be found on Spacebattles here
. It can be found on Archive of our Own here.
Izuku Doofenschmirtz is the son of reformed villain Dr Heinz Doofenschmirtz and his wife, active villainess Inko Doofenschmirtz (who took over control of LOVEMUFFIN after her husband retired from villainy). Inheriting his father's talent for invention, he hopes to grow up to become a hero support specialist. There's just one problem: thanks to a screwy piece of legislation in Japan, the Mad Science For Evil Act, everyone whose IQ exceeds a certain threshold is required by law to be a villain until they have met a certain minimum quota of evil. And the quota assigned to Izuku is such that if he wants to be clear of his obligations to supervillainy by the time finishes high school so he can get a Hero Support job after graduating from UA, he'll need to come up with and implement a villainous scheme virtually every day for the entirety of his junior high school career.
And so every night, Izuku must come up with a new evil plan to strike terror into the Musustafu area, opposed by his OWCA-assigned nemesis, trainee agent Tsu the Frog Girl, while spending his days trying to survive being in the worst junior high school in Japan, accompanied by his childhood friend Katsuki Bakugo, and transfer student Tsuyu Asui, who is clearly not Tsu the Frog Girl, despite having the same name, face, voice, Quirk, etc of his nemesis, because she doesn't wear a hat.
Tropes used in this work include:
- Adaptational Relationship Overhaul: Izuku and Bakugo are on much better terms than in canon, possibly because Izuku is going for hero support rather than heroism and thus is no threat to Bakugo's dreams, and possibly because Aldera Junior High is such a terrible school that the praise of the faculty means nothing to him.
- Clark Kenting: It's a Running Gag that villains cannot recognize OWCA agents when they're not wearing their issue fedoras. This is most often done with Izuku, who refuses to recognize that his friend Tsu is Agent T of the OWCA, even upon seeing Tsu put the hat on, but was also once done with Re-Destro thinking his operations were being thwarted by himself until Dr Doof donned his own hat.
- Izuku can partially see through Tsu's disguise while drunk on spaghetti.
- Even Evil Has Standards: Most villains are appalled at one provision of MSFE, namely the fact that not only is the government forcing certain people to be villains, but they are also forcing them to do it at their own expense. Even All For One hates that bit - he wrote the original draft of MSFE, and there was a provision about subsidizing mad science villains, but the Diet struck that section out in committee before passing the bill.
- Failure Is the Only Option: Zigzagged despite the fact that Izuku is only phoning it in. The likelihood of Tsu being able to thwart Izuku's plot of the day seems to be proportionate to the severity of his goal: plans to take over the Musustafu area are pretty much guaranteed to fail, while things that are targeted at his pet peeves like knocking out all his noisy neighbors so he can get some sleep have a good chance of success.
- Forced into Evil: The whole point of MSFE.
- Friendly Enemy: Izuku is on very friendly terms with his nemesis even when seeing her as his nemesis and not as her hatless alter ego. He even takes one of his few vacation days from his grueling villainy schedule on the date of AgentCon so she can take the day off to attend. In fact, this is apparently so common among the heroically inclined people Forced into Evil by MSFE that stealing another mad scientist's nemesis is socially equivalent to stealing their boy/girlfriend, and Izuku having one scheme thwarted by a hero other than Agent T made him wonder if he was being dumped (to his relief, she was just out sick that night).
- Hilariously Abusive Childhood: Not Izuku, but both his parents. Dr Doof's is P&F canon, and here Inko was somehow raised by vending machines because her parents were so bad.
- Me's a Crowd: Izuku has an -inator that allows him to be in multiple places at once, which he uses to work odd jobs to fund his villain career.
- Ninja Pirate Zombie Robot: Izuku has a set of Robot Pirate Ninjas premade for when he gets hit with a classmate's "turn people into pirates" Quirk so he can stay on theme for the scheme of the day. Complete with a mechanical land-going pirate ship. The Zombies are a separate incident.
- Pass the Popcorn: One of the many Quirks that All For One has stolen over the years conjures popcorn from thin air. He calls on it while watching Izuku try to blow up Aldera.
- Poke the Poodle: Most of Izuku's evil schemes are this in nature, and usually targeted at some pet peeve of his, such as the neighbors who won't stop playing loud music at late hours on school nights, and Truck-kun. The main reason for this is because Izuku didn't want to be an evil scientist at all but an act of legislation legally forces him to and he tries to do the exact bare minimum of evil-doing required by the law. One example is having the mast of his ship be exactly one quectometer taller that legally allowed, and one quectometer simply isn't relevant to everyday life.
- Required Secondary Powers: Firebreathing is only a useful quirk if it comes with a fireproof respiratory system. Unfortunately for Dr. Doof, his fire resistance is only strong enough to prevent permanent injury while not being strong enough to prevent pain.
- Running Over the Plot: Kids at Aldera Junior High encounter Truck-kun at a frighteningly regular basis. To the point where Izuku built the school an -inator to un-isekai the lost students.
- Self-Destruct Mechanism: Most of Izuku's -inators come pre-equipped with a "reverse effects" button and a "self-destruct in Izuku's face" button, to allow for easy thwarting.
- Shout-Out: Tsuyu attempting to destroy Izuku's weapon for destroying Aldera is reminiscent of the trench run in A New Hope.
- Sucky School: Aldera Junior High. Students get run over by trucks on a regular basis... while inside the building. The school is used to hold the overflow from the local supermax prison, and the criminals are brutally bullied by the students. Zombies roam the halls, and vampires nest in the attic. Various heroic and villainous groups have tried to destroy the school, and all have failed. Even when the Izuku Zombie Apocalypse started up and the school was Izuku-free, it was still considered one of the least safe places to hide.
- Villain Has a Point: When the "villainous" Izuku attempts to destroy Aldera, OWCA is reluctant to stop him since they are aware what a horrible school it is. Unfortunately, they can't loophole out of it, so they are forced to at least try to stop him.
- Who Names Their Kid "Dude"?: The leader of the alien invaders has a poor opinion of his own species' naming conventions, and when one of them is called 'The guy that voiced doubt in our chances of success for the invasion', it is easy to see why.
- Zombie Apocalypse: Mei creates a device that turns people into Izuku clones and per the Self Aware Zombie Infestation Act, they are forced to play the part of zombie hordes and enact a zombie apocalypse.
