History Fanfic / ToForgetIsUnforgivable

The next day, the school assembly announces that Midoriya Izuku committed suicide.

** Katsuki is ostracised by everyone except his parents after Izuku died of suicide because they all know he is the primary cause of that.

The next day, the school assembly annouces that Midoriya Izuku commited suicide.

** Izuku's faviorite sweet is sourpatchwatermelon candy. [[spoiler:Gojo always makes sure to get him some.]]

* WorldsStrongestMan: All Might is this among Quirk users, Sukuna among curses, and Gojo among sorcerrers. Gojo also thinks that [[spoiler:Izuku has a good chance to become a major threat over time.]]

** Katsuki is ostracised by everyone except his parents after Izuku committed suicide, because they all know he is the primary cause for that.
* AndShowItToYou: [[spoiler: Izuku's method of killing strong cursed spirits is to rip their hearts right out of their chest cavities. Katsuki is traumatized for the rest of the series.]]

** Izuku commits suicide offscreen after his encounter with All Might.

* DueToTheDead: [[spoiler:Katsuki [[DiesWideOpen closes the eyes]] of the dead Jujutsu sorcerrer he found in the alley.]]

* KarmaHoudini: The police drops the murder charges against Katsuki for inciting suicide because it would be [[FantasticRacism a shame to bar someone with a quirk like his from heroics]].

* ShockAndAwe: Izuku's Cursed Energy manifests as lightning, and he perpetually smells of ozone. It's implied that's because it was starting to rain when he died. Doubles as a MythologyGag, as this is how One For All manifests for him in-canon.
* SpottingTheThread: All Might founding a pro-quirkless foundation called the Midoriya Project, his oddly personal tone in his announcement speech, and Izuku's rage whenever he sees the man, make Katsuki realize that All-Might is somehow connected to Izuku's suicide. However, he chooses not to bring it up because he doesn't want to set off Izuku.

* VoluntaryShapeshifting: Izuku has two forms: his human appearance from right after he died (basically him but with the injuries from his suicide), and his full blown Cursed Spirit appearance ([[spoiler:a green and incredibly skinny humanoid demon with long hair, hollow eyesockets, a skull-like face with fangs, claws, and covered with pages from his destroyed notebook]]).

* AwesomenessByAnalysis: Izuku gets a few extra points in this fic, because Aizawa noticed that he was able to effectively merge Miruko and Edgeshot's fighting styles when facing the Abomination.

* CharacterizationMarchesOn: Discussed by Aizawa, as Katsuki has become TheQuietOne and very withdrawn, being a scathing contrast from how all his school reports described him.

* FantasticRacism: Katsuki is enraged to find out that most Jujutsu sorcerers, including Gojo who radiates power, are quirkless.

* HeroicSacrifice: Aizawa knew that he would die if he tried to face the Abomination, but he decided to do so anyway so anyway because "nobody dies on his watch". Fortunately, Katsuki and Izuku rescued him.

* MutuallyExclusiveMagic: Gojo explains that it is near impossible for somebody with Cursed Energy to also have a quirk, and that 95% of Jujutsu Sorcerrors are quirkless, himself included. Katsuki only has cursed energy because of Izuku, and Tokoyami is the exception of exceptions (according to the statistics provided by Gojo, the likelihood of someone having a quirk compatible with Cursed Energy is 0.05%).

* PrecisionFStrike: Aizawa after his encounter his Gojo, complete with some [[LaughingMad hysterical laughter]].

* AdaptationalKarma: Izuku's suicide launched a large-scale investigation on how he was treated called the Midoriya Project, which led to several teachers being forced to resign.

* CouldHaveAvoidedThisPlot: Discussed. Katsuki tells Izuku that if he never came back as a cursed spirit then Katsuki would not be targetted by them. Izuku counters that he would still be vulnerable to the one in the alley from the first fic.

* JackBauerInterrogationTechnique: Downplayed. Principal Yaga says that the reason he has his dolls attack the potential students while questioning them is because people are more honest when under pressure.

* HiddenPurposeTest: The reason Gojo and Principal Yaga have Izuku take the Jujutsu Tech entrance exam (well, a version of it), is to see if Izuku will protect anyone ''other'' than Katsuki. Izuku moves to protect ''Gojo'', despite knowing he's untouchable, because his automatic instinct is to protect everyone, thus passing the test with flying colours.

* LaserGuidedKarma: Discussed. Katsuki wonders if Izuku is haunting him for the purpose of making him experience the same humiliation, helplessness and isolation he felt when he was alive.

* TraumaButton: Feeling helpless reminds Katsuki of the time the Sludge Villain almost suffocated him, and the dead Jujutsu sorcerer he found in the alley. He deals with it by forcefully shoving the memories back in his head, because he thinks there's no point reliving it.

** For all their neglect, the old teachers at Aldera Middle School didn't tolarate bullying taking place right in front of them, so Izuku used to use their presence as a detterent.
** Katsuki loathes having other people apologizing for his wrongdoings, as they shouldn't take responsibility to his actions.

* FirstNameBasis: Maki insists that everyone calls her by her first name, and she enforces it with hitting harder during spars. Katsuki correctly attributes this to family issues and complies.

* SharedFamilyQuirks: Katsuki and his mother Mitsuki are both the epitome of SirSwearsALot, and are HotBlooded to match.

* ActuallyPrettyFunny: Katsuki is usually angered by everything Izuku does, but when Izuku [[spoiler:force feeds Sukuna a ghost pepper]] Katsuki can barely hold in his laughter.

* FamedInStory: Katsuki's father Masaru is a well-known fashion designer, so Kugisaki immedietely recognizes the surname and Katsuki's relation to him.

* GilliganCut: Katsuki's first impression of [[spoiler:Sukuna]], which was finding a book that had one fifth of its length dedicated to him, is to assume he is a character akin to [[BigGood All Might]]. Well, one SmashCut later he finds out that [[spoiler:he is right about the WorldsStrongestMan aspect, but definitely not about the attitude.]]
* GoodParents: Gojo has a very good opinion of Katsuki's parents, as he sees that they are very caring of Katsuki and Mitsuki would definitely pick a fight with Gojo is he were to wrong her son.

* HateAtFirstSight: Kugisaki and Katsuki decide that they loathe each other the ''second'' they nmeet.

* LoopholeAbuse: Principal Yaga bans Gojo from having Izuku and [[spoiler:Sukuna]] spar on school grounds, so Gojo decides to have them do it ''off''-school grounds - even though Yaga meant to ban him from doing it at all.
* MagicallyBindingContract: Gojo figures out and tells everyone that [[spoiler:Yuji and Sukuna have a binding vow]]. Using that as a prompt, he launches on a lecture about binding vows that are imposed both between several people and on one-self.

* NotSoDifferentRemark: Gojo compares Katsuki with himself, in how they both had to extessively study and master a particular field of physics (quantum theory for Gojo and aerodynamics for Katsuki) in order to fully master their abilities.

* {{Tsundere}}: How Izuku decides to intrepert Katsuki's attitude.

* CannibalismSuperpower: Izuku can eat other curses to grow more powerful, and he remembers doing that a lot when he first turned into a cursed spirit. Gojo says this explains how he was able to reach Grade 2 quickly, but doesn't explain how he reached Special Grade. Izuku admits that his memories from back then are too fuzzy, so the only explanation is that he ate something that was special grade, but can't remember what (or actually doing it).

* FuzzTherapy: Yoshi - the black divine dog - has basically turned into a therapy animal. Fushiguro lets im out for as long as possible and he with Izuku spend that entire time petting him to stay grounded. Yoshi LOVES the attention.

* ImaginationBasedSuperpower: Gojo theorizes that in contrast to popular belief, Domain Expansions aren't technique based but imagination based, and mentally cites the third year Hakari as an example.

* OutsideContextProblem: Geto (aka [[spoiler:Kenjaku]]) admits that he has never heard of a cursed spirit that wants to protect humans like Izuku does, and the only possible solution he can think of dealing with him is to excorsice him.

* PoisonousPerson: Junpei constantly secrates poison from his hands, and he cannot control how potent it is.

** [[spoiler:Katsuki figures out that Yuuji is alive and that Gojo and Izuku know about it, and he is NOT happy.]] He actually tries to reveal the secret at one point, but is cut off.

* TookALevelInKindness: Katsuki starts caring more for his classmates, as he now cooks for everyone, accommodates their preferences, and generally talking to the others more - even if he's aggressive about it.

** [[spoiler:Katsuki tries to reveal that Yuuji is alive to Fushiguro and Kugisaki, but Izuku cuts him off.]]

* RuleOfSymbolism: Izuku's curse form. Inhuman shape aside, [[spoiler:he is covered with the scars and injuries that have been inflicted on him from his years of bullying (notably, the majority of them are explosion scars), he looks wet like he has been drenched in rain, the injuries that killed him are constantly bleeding, he cries black tears, and he is covered in the pages of his destroyed "Hero Analysis For The Future No. 13" notebook. The cover of the notebook covers his heart.]]

* NamedByTheAdaptation: Izuku decides to name Fushiguro's dogs. [[spoiler:He decides to name White "Keshi" (meaning Eraser) and Yogore (meaning Smudge). However, he only gets to tell Fushiguro after Keshi dies in the Cursed Womb, so he names the remaining dog "Yoshi", combining the kanji from the twonames.]]

This series contains the fllowing fics: