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* SkewedPriorities: Tomura is more concerned with the reveal that All for One manipulated him into killing his pet dog instead of the reveal he manipulated him into killing the rest of his family. Izuku calls him out on this, but Tomura justifies himself by making the compelling case that his dad was abusive and that the rest of the family did absolutely nothing to help.
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* BigNo: Monoma shouts a big no after learning that after being isekai'd, the class rivalries don't matter anymore.
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* GoingNative: Izuku is worried that he and his companions are adapting too quickly to the new world, from Ochako converting to the faith of one of the local gods to the hero students adapting their morality to the lower standards for good.


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* MeaningfulName: The dungeon group notices that the names of the High Gods are derived from Latin. Saevius for example is derived from the Latin word for 'cruel', 'barbarous' or 'savage'. Luna is a moon-based name and she is a moon goddess. Same with Sol the sun goddess.
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* InsistentTerminology: When Tomura realizes them just taking things from the burial site they found counts as graverobbing, Izuku insists on calling it "archeology".

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* InsistentTerminology: When Tomura realizes them just taking things from the burial site they found counts as graverobbing, grave-robbing, Izuku insists on calling it "archeology"."archeology". Momo eventually disabuses him of this notion. She says that for something to count as archeology, it has to be done for the purpose of advancing knowledge and items taken have to be placed in a museum or otherwise used in study. What they are doing it taking things for personal benefits.

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** Luna explains how the Laws mechanic work for Dungeons in Chapter 20.



** Izuku and Tomura are given additional flexibility in managing dungeon servants not available to other Dungeons:

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** Izuku and Tomura are given additional flexibility in managing dungeon servants not available to other Dungeons:Dungeons. There are some limits for balancing reasons, but the options are as follows:



*** The souls made up of the ''My Hero Academia'' also have the option of ''overriding'' the soul of a daemon they captured as opposed to getting to agree to serve them. Luna is giddy to see the results of that.

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*** The souls made up of the ''My Hero Academia'' also have the option of ''overriding'' the soul of a daemon they captured as opposed to getting to agree to serve them. This choice is also a permanent one, and Luna is giddy to see the results of that.

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* FanDisservice: Whenever Izuku feels Tomura went too far, he gets payback by showing him images of naked All for One and Dabi. Worse, they are shown as ''catboys''.

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* FanDisservice: Whenever Izuku feels Tomura went too far, he gets payback by showing him images of naked All for One and Dabi. Worse, they are shown as ''catboys''. Izuku also uses other men in his torment of Tomura.


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** Chapter 20 provides descriptions for several different spells.


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* NewLifeInAnotherWorldBonus: Invoked. Luna read up more of the isekai genre and realizes she didn't give Izuku and Tomura special cheats isekai protagonists usually get, and so, gives them some in Chapter 20. Their bonuses are as follows:
** They now have the ability to cash in divine favour for gifts from the various deities. This ranges from summoning shard spirits and daemons from their domains, to having one entire level modelled after a single spiritual world.
** Izuku and Tomura are given additional flexibility in managing dungeon servants not available to other Dungeons:
*** Normally, souls contracted to Dungeons can have skills inserted into them by the dungeon, but lose them when they leave. Luna makes it so that with Izuku and Tomura, they have the option of keeping those skills. However, they ''cannot'' rejoin the dungeon. The decision to leave will be permanent in that case.
*** The souls made up of the ''My Hero Academia'' characters also gain the ability for independent growth and give the dungeon access to new skills that way, ''but'', they must decide on a permanent body. No body switching is allowed for any individual that makes this choice.
*** The souls made up of the ''My Hero Academia'' also have the option of ''overriding'' the soul of a daemon they captured as opposed to getting to agree to serve them. Luna is giddy to see the results of that.
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* HealingCheckpoint: Node Rooms contain secondary dungeon cores that allows skilled enough mages to tap into the mana flow of the dungeon, allowing them to use the dungeon's own mana to cast spells.
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* RuleOfThree: In Chapter 19, thrice Tomura tries to rebuke Momo's assertion that the League of Villains have a poor track record, and thrice Izuku points out the issue with each argument he makes.

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* LetMeGetThisStraight: In Chapter 19, Yaoyorozu sums up the story premise and events thus far to see if she understands everything.



* ShoutOut: Tomura references ''VideoGame/DarkSoulsI'', specifically the Sen's Fortress location, as the inspiration for his boulder trap level.

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* ShoutOut: ShoutOut:
**
Tomura references ''VideoGame/DarkSoulsI'', specifically the Sen's Fortress location, as the inspiration for his boulder trap level.level.
** When Yaoyorozu and Kirishima first manifest, they point to each other in a way that reminds Tomura of the [[WesternAnimation/SpiderMan1967 famous Spider Man meme]].
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* BaitAndSwitch: Tomura tells Izuku that his words reached his heart and he will strive to be better. It seems like he will be a better person before he clarifies he will be a better ''villain''.


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* ShoutOut: Tomura references ''VideoGame/DarkSoulsI'', specifically the Sen's Fortress location, as the inspiration for his boulder trap level.
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* FanDisservice: Whenever Izuku feels Tomura went too far, he gets payback by showing him images of naked All for One and Dabi. Worse, they are shows as ''catboys''.

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* FanDisservice: Whenever Izuku feels Tomura went too far, he gets payback by showing him images of naked All for One and Dabi. Worse, they are shows shown as ''catboys''.



* GoodNewsBadNews: Tomura tells Izuku the good news that the latter's slime trap worked, before giving the bad news that the intended non-lethality didn't work properly and Itar, the person who fell for it, is dead.

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* GoodNewsBadNews: Tomura tells Izuku the good news that the latter's slime trap worked, before giving the bad news that the intended non-lethality feature didn't work properly and Itar, the person who fell for it, is dead.



* ItOnlyWorksOnce: Luna's failsafe to protect Izuku's and Tomura's Astral Core for certain doom is explicitly a one time thing only.

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* ItOnlyWorksOnce: Luna's failsafe to protect Izuku's and Tomura's Astral Core for from certain doom is explicitly a one time thing only.
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* PocketDimension: Pass the first level of a Dungeon, each separate level is technically its own separate space. This allows Izuku and Tomura to move the passageway between levels on one floor without affecting other floors.


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* StalkerWithACrush: Ochako succeeds in getting Himiko to downplay this trope by making her understand that respecting boundaries will endear her to Ochako and Izuku better than her simply violating their privacy and personal space.

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* BizarreAlienBiology: Hamadryads bleed tree sap instead of blood.



* DesperatelyCravesAffection: Izuku and Tomura quickly realize that if Himiko's feeling lazy, a quick way to get her off her ass and do some work is to tell her either Izuku and/or Ochako would appreciate the effort.
* DidntThinkThisThrough: Himiko throws her torch at the hamadryad while fighting her. While it helps and she ultimately kills her opponent, it also started a small fire. Thankfully, it is put out before it could grow out of control.



* HoistByHisOwnPetard: It doesn't come to fruition, but Tomura admits to Izuku he was already considering killing All for One for being annoying. On further prompting, he also tells Izuku All for One taught him to destroy everything he finds annoying says his mentor shouldn't be surprised by that, which Izuku concedes to.

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* HoistByHisOwnPetard: It doesn't come to fruition, but Tomura admits to Izuku he was already considering killing All for One for being annoying. On further prompting, he also tells Izuku that All for One taught him to destroy everything he finds annoying and says his mentor shouldn't be surprised by that, which Izuku concedes to.



* TaughtByExperience: The fox-beastkin elder admits that she used to be a rash youth alongside the rest of her generation. And then she noticed her fellows dying and learned better, becoming a wiser elder.

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* TaughtByExperience: TaughtByExperience:
** Izuku and Tomura are tossed into the deep end by Luna with minimal aide and guidance in fulfilling the task she gave them, and so have to learn almost everything about how the dungeon and the world in general works through experimentation and experience.
**
The fox-beastkin elder admits that she used to be a rash youth alongside the rest of her generation. And then she noticed her fellows dying and learned better, becoming a wiser elder.
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To that end, she copies the minds and personalities of the people of a specific world and implants those into available souls, and picks two of them to be the joint minds of a Dungeon Core.

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To that end, she copies the minds and personalities of the people of a specific world and implants those into available souls, and picks two of them to be the joint minds of a Dungeon Core.
Core. Now Izuku and Tomura must work together to build a great dungeon after being thrown into the deep end by Luna.




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* ActuallyPrettyFunny: Izuku admits that Tomura calling All for One's level of edgelord pizza-cutter level, as in, all edge and no point, to be an actually good insult.
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* EatingTheEyeCandy: Himiko isn't shy about appreciating Ochako's look both in general and when she's in action.


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* InsistentTerminology: When Tomura realizes them just taking things from the burial site they found counts as graverobbing, Izuku insists on calling it "archeology".


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* MrExposition: Aeonia is the first being the dungeon crew encounters that they could ask things about the world, and she more than delivers with in-dept explanations.
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* MetaphoricallyTrue: Not wanting to outright lie to Himiko but also not wanting to alienate her, Izuku tells her that Ochako is thinking warm thoughts about her. Tomura is quick to clarify that it means Ochako hopes she burns in hell.


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* TooKinkyToTorture: To Ochako's consternation, her ability to punish Himiko for various things is severely compromised by the fact that Himiko enjoys being punished by her. Admittedly, an inability to permanently die takes most of the fear out of such things.
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* DarkAndTroubledPast: Invoked by All for One. He manipulated the circumstances of Tomura's Quirk Awakening to destroy his home and family and leave Tomura wondering the streets until All for One "finds" him. Tomura did not realise the manipulation until Izuku points out that it is nigh-impossible for the authorities and society in general to randomly drop the ball that hard for him.


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* FanDisservice: Whenever Izuku feels Tomura went too far, he gets payback by showing him images of naked All for One and Dabi. Worse, they are shows as ''catboys''.


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* HoistByHisOwnPetard: It doesn't come to fruition, but Tomura admits to Izuku he was already considering killing All for One for being annoying. On further prompting, he also tells Izuku All for One taught him to destroy everything he finds annoying says his mentor shouldn't be surprised by that, which Izuku concedes to.


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* ItsPersonal: Tomura's hatred of All for One becomes ''personal'' when Izuku makes him realise All for One manipulated the circumstances that led to his beloved pet dog Mon-chan dying.


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* PlatonicLifePartners: Discussed. Tomura thinks best friends of compatible orientations and genders are just couples in denials in defiance of this trope.

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* DungeonBasedEconomy: It is possible for societies to make deals with intelligent enough dungeons for the society to obtain goods from the dungeon in exchange for the dungeon taking the occasional casualty and new goods to produce. This doesn't unbalance the economy though since more valuable goods require higher mana levels to produce, which necessitates braving more dangers to get them.



* GoodNewsBadNews: Tomura tells Izuku the good news that the latter's slime trap worked, before giving the bad news that the intended non-lethality didn't work properly and Itar, the person who fell for it, is dead.



* InfoDump: Aeonia gives a long explanation on the cosmology and theology of the world in Chapter 17.

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* InfoDump: InfoDump:
** The fox-beastkin elder tells her companion Uzar a lot about what she heard about how dungeons work in Chapter 7. This is useful for Izuku and Tomura since they manage to hear the entire explanation and put up a convincing act to outsiders.
**
Aeonia gives a long explanation on the cosmology and theology of the world in Chapter 17.


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* TaughtByExperience: The fox-beastkin elder admits that she used to be a rash youth alongside the rest of her generation. And then she noticed her fellows dying and learned better, becoming a wiser elder.
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* LoveMakesYouCrazy: Himiko is perfectly happy to die on Izuku's orders because she could get him to call her by her first name after she gets resurrected. Izuku lampshades this to Tomura who tells him he long stopped expecting logic from her.
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* DeathIsCheap: When a Dungeon Servant dies, it's not that big a deal. The Dungeon can just revive them if they recover the souls fast enough and have the mana levels to spare. This allows Tomura to tell Himiko to die ''tactically'' so that the people after Ekana will assume Ekana's dead without further investigating.
* DemBones: The Breathless Tide have a category of undead called Skeleton, which are just walking skeletons.


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* DistractedByMyOwnSexy: Himiko is briefly distracted by the fact Tomura made her breasts bigger when she takes off her clothes.


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* ShamelessFanserviceGirl: Himiko has ''zero'' qualms about using her body to get a reaction out of Izuku.
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* SeeingThroughAnothersEyes: Dungeons have the ability to see through the eyes of their servants, as well as more generally experience the world through their other senses.



* TrappedInAnotherWorld: From the perspective of the characters, they were forcibly taken from their world and have no hope of ever going back.

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* TrappedInAnotherWorld: From the perspective of the characters, they were forcibly taken from their world and have no hope of ever going back.back.
* WhyDidntIThinkOfThat: Izuku calls out Tomura for his stupidity as a supervillain leader by pointing out that since Himiko was able to turn into him, they had the ''perfect'' way to frame him of serious crimes and ruin Izuku's hero career. Tomura for his part is shocked he himself did not think of such a brilliant plan.
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* NightmareRetardant: InUniverse. The more Izuku learns of and deals with the eccentricities of the League of Villains, the more their previously intimidating image gets broken.
* PervertRevengeMode: When Tomura shows Izuku a preview with an image of a naked Ochako, then alters it so her breasts becomes bigger, Izuku retaliates on Ochako's behalf by showing Tomura a naked Dabi.
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* InfoDump: Aeonia gives a long explanation on the cosmology and theology of the world in Chapter 17.
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* NamesToRunAwayFromReallyFast: The trope is name-dropped when Tomura learns that one of the old names for Rampant Bloom is Locust-That-Walks. Izuku agrees with his sentiments.
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* DramaPreservingHandicap: If mana-levels allow it, a dungeon can freely change the layout of a floor, unless there are outside forces present. This means no making new traps for active hostiles to make things easier.


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* ItOnlyWorksOnce: Luna's failsafe to protect Izuku's and Tomura's Astral Core for certain doom is explicitly a one time thing only.


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* TeethClenchedTeamwork: Izuku and Tomura don't like each other, but have no choice but to work together to survive. They do choose to get on each other's nerves though.
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* DiscardAndDraw: Izuku and Tomura have the ability to switch skills around for their subordinates. They can't do this freely though as the more skills they have, the higher the mana they need to function.


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* NecessaryDrawback: Izuku and Tomura can't just give their subordinates as many abilities as possible. More skills requires more mana levels for their subordinates to function, so if they give too much, they can't do things outside of the dungeon so easily.
* SelectiveObliviousness: One huge blind spot for Izuku is him giving Bakugou undeserved admiration. Even Tomura can see Bakugou's flaws, but Izuku refuses to see them.
* SheIsNotMyGirlfriend: Izuku denies Ochako and Himiko are his girlfriends to Tomura in Chapter 16. Tomura just grumbles at him.

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* AdaptationPersonalityChange: After being forced into a fantasy world, Izuku turns towards being very snarky with Tomura as a coping mechanism.



* CloningBlues: One not-insignificant point of contention the characters have with what Luna did is that they are the ''copies'' of the original people they were. Some are more affected by this fact than others.

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* CloningBlues: CloneAngst: One not-insignificant point of contention the characters have with what Luna did is that they are the ''copies'' of the original people they were. Some are more affected distraught by this fact than others.



* EnemyMine: ''Enforced''. The hero students and the League of Villains are forced by Luna to work together to survive.

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* EnemyMine: ''Enforced''. The hero students and the League of Villains are forced by Luna to work together to survive. Especially Izuku and Tomura since as the joint consciousness of the Astral Core, anything they do with the dungeon requires them both to agree.
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* IHaveYourWife: Luna forces Izuku to comply with her orders to kill the chosen of her sister by threatening eternal torment of his loved ones.
* MissionFromGod: Luna the goddess of anarchy and revolution orders Izuku and Tomura to kill the chosen of her sister, after which she will leave them alone. Izuku has reservations due to Luna being a self-proclaimed evil god.

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''[[https://archiveofourown.org/works/51788791/chapters/130931383 The Core Problem]]' 'is a ''Franchise/MyHeroAcademia'' fanfiction created by Mirrond.

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''[[https://archiveofourown.org/works/51788791/chapters/130931383 The Core Problem]]' 'is Problem]]'' is a ''Franchise/MyHeroAcademia'' fanfiction created by Mirrond.


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* TheAssimilator: A dungeon gains more options by absorbing things within its domain.
* ButForMeItWasTuesday: Izuku is annoyed Tomura doesn't remember his name even though he threatened to kill him. Tomura responds that he threatens to kill a lot of people, and that incident with Izuku was not that special to him.
* CloningBlues: One not-insignificant point of contention the characters have with what Luna did is that they are the ''copies'' of the original people they were. Some are more affected by this fact than others.
* ADungeonIsYou: Izuku and Tomura are made the joint consciousness of a dungeon's core, and have to work together to get things done.


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* GodOfEvil: Luna outright calls herself a god of evil, and between her domain of anarchy and her actions of dumping people into a life-and-death situation in Chapter 1, she lives up to her claim.
* SuperhumanTrafficking: The Astral Core of a dungeon is extremely valuable, but the only ethical source of it is from authorized executions of homicidal ones. Demand ''far'' outstrips the legal supply and dungeons that don't deserve that fate may find themselves facing people trying to kill them and take their core.
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Luna, the deity of anarchy and revolution, desires to slay the chosen champion of her sister. However, due to their very nature, Luna would be too bored to follow a straightforward plan and wants her pawns for the gambit to attempt rebellion against her.

To that end, she copies the minds and personalities of the people of a specific world and implants those into available souls, and picks two of them to be the joint minds of a Dungeon Core.

''[[https://archiveofourown.org/works/51788791/chapters/130931383 The Core Problem]]' 'is a ''Franchise/MyHeroAcademia'' fanfiction created by Mirrond.

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!!This fanfic contains examples of:

* AdaptationalSuperpowerChange: All Quirks are lost upon the transfer to the new world.
* AdaptationRelationshipOverhaul: Due to being forcefully taken from their world and placed in the new one, the characters previous conflicts in the canon of ''Manga/MyHeroAcademia'' are rendered largely meaningless and most see it as a fresh start.
* EnemyMine: ''Enforced''. The hero students and the League of Villains are forced by Luna to work together to survive.
* TrappedInAnotherWorld: From the perspective of the characters, they were forcibly taken from their world and have no hope of ever going back.

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