History Characters / YesterdayUponTheStair

* BaitAndSwitchComment: Comes across as a BadassBoast but when Nemoto asks if he's scared, Izuku admits he's terrified, of what he's going to have to do to them.

* NervesOfSteel: Deconstructed. Izuku's experiences with ghosts and Bakugou have left him with great skills at compartmentalizing, which is both a good and bad thing after the experience passes.

* TroublingUnchildlikeBehavior: Living with ghosts all his life has left Izuku a little creepier than before. The various skills he's picked up helping them with unfinished business (like lockpicking), has Present Mic wonder about his possible DarkAndTroubledPast.

* TalkingWithSigns: Very adept at JSL, which he learned to utilize when communicating with ghosts stealthily. He also uses this a lot with people he knows when he's under intense emotional stress and can't talk [[spoiler:(such as after his rescue from Kamino Ward)]].

* AdaptationalBadass: {{Downplayed|Trope}}. While Izuku's quirk isn't much use in a fight, living with ghosts his whole life and having opportunities to help people that nobody else can have helped to put some extra steel in his spine even before Midoriya inherits One For All.

* MyGodWhatHaveIDone: [[spoiler:He reacts this way when Dr. Tsubasa's ghosts force him to leave before All For One destroys the building he was kept in, and finding the doctor's ghost shortly after escaping.]]
* NervesOfSteel: Deconstructed. Izuku's experiences with ghosts and Bakugou have left him with great skills at compartmentalizing, which is both a good and bad thing when he's under pressure.

* NervesOfSteel: Deconstructed. Izuku's experiences with ghosts and Bakugou have left him with great skills at compartmentalizing.

* TheEmpath: Rei's Quirk.

* AmplifierArtifact: One For All acts as one for his original Quirk, allowing [[spoiler:ghosts near him to interact with the world more. It's gotten to the point where, with One For All active, they become visible to others and attack others, seen best when Rei tackled Bakugou to the ground when he and Izuku were having an argument post-League of Villains kidnapping, leaving Bakugou to gape at her in shock.]]
* BaitAndSwitchComment: Comes across as a BadassBoast but when Nemoto asks if he's scared, Izuku admits he's terrified... of what he's going to have to do to them.

* {{Claustrophobia}}: Suffers from a terrible case of this, to the point of only using stairs at the mall and begging and bribing Eijirou when the latter tries to pull him into an elevator.
* CombatPragmatist: Becomes this under the tutelage of Shimura Nana, something that Aizawa approves of with the understanding that since your enemies won't be fighting fair, neither should you. Best shown during his fight with Muscular, where he hits Muscular with a groin attack, breaks his cybernetic eye, and gouges out his regular eye with his bare hands since Muscular couldn't augment the muscles in those areas.
** Izuku [[spoiler:partially breaks his right wrist to free his hand and bites Himiko on the nose for his plan to free himself and Bakugou.]]

* CreepyShadowedUndereyes: With all the nightmares that come from dealing with ghosts, Izuku is left with these.
* TheDarknessGazesBack: Midoriya has [[https://en.wikipedia.org/wiki/Tapetum_lucidum tapetum lucidum]], which makes his eyes glow like a nocturnal animal's in the dark (which tends to scare his friends when they're not expecting him), and pictures of him tend to have glowing red eyes. [[spoiler:Dr. Tsubasa]] speculates it's a physical manifestation of his "invisible quirk".
* DeadpanSnarker: Izuku's has quite the dry wit at times, such as responding to Sir Nighteye's rather pathetic attempts to apologize with a dry, "Don't hurt yourself".

* MagneticHero: Justified, as he has learnt to play on people's emotions and make them like him, due to the amount of hostile ghosts he has dealt with in the past.

* SlasherSmile: His smile has been described as "like he's about to eat a baby" by Tsuyu, and Gran Torino acknowledges that unlike All Might, who wears his smile like a part of his costume, Midoriya brandishes his smile like a weapon.
* StressVomit: Happens after his incident with Shigaraki at the shopping mall [[spoiler:and after being released from Compress' containment orb]].

** A side story details how ten-year-old Izuku got the bullies off his back after switching schools: [[spoiler: he worked three loose teeth out while his class was watching a movie, so that blood would pour from his mouth in the flickering projector light. The entire class panicked and later voted him "most likely to be possessed."]]

->''More ghostly rattling. Izuku has never heard her speak for as long as he's known her, and she's almost as old a friend as Bakugou was. That's all right, though. She doesn't need to talk to make him feel less lonely.''

Izuku's best friend and CanonForeigner, Rei is a mute ghost who died under mysterious circumstances and considers Midoriya her 'little brother'. [[spoiler: Her real name is Morigawa Hitomi, and she was used as a test subject for the Noumu project before dying 30 years previously]].

* BigSisterInstinct: She feels very protective towards Izuku, who she thinks of as her little brother. Unfortunately, there's not much she can actually do to protect him [[spoiler:yet. It seems One For All is strengthening Midoriya's ISeeDeadPeople quirk, gradually making ghosts near him stronger to the point of being able to interact with people. She's eventually able to actively protect Midoriya by tackling Bakugou when he tried to attack him]]. She's also fond of Eri, who reminds her of Izuku when they first met.
* BlackEyesOfEvil: Subverted. While she has something of an immature cruel streak (though mostly to those who are cruel to Izuku), she's still a fundamentally good person.

* DarkAndTroubledPast: A poltergeist who [[spoiler:was an unwilling test subject for All For One's Noumu experiments, suffering horrific trauma at the hands of his scientists until she was rendered brain-dead.]] It's such that she doesn't ''want'' to remember her past, vastly preferring her new "life" instead as Rei.
* DeathAmnesia: Doesn't remember how she died or even her own name. [[spoiler:She also doesn't want to remember, as in her opinion no one cared for Hitomi, she was killed and no one cared. She only made friends and met Izuku as Rei, and prefers that.]]

* GhostAmnesia: She doesn't remember [[spoiler:being killed by All for One's Noumu experiments]].

* {{Poltergeist}}: [[spoiler:And unlike normal poltergeists who will typically revert to normal ghosts when they stop stressing out, Rei is like this permanently due to the intense trauma she suffered from being a test subject for Noumu experiments.]]

* SatelliteCharacter: Being dead, she doesn't really have much to do except for following Izuku and helping him out.
* SuddenlyVoiced: She speaks for the first time ever in chapter 39 when she [[spoiler:rejects her human name]]. Izuku notes he's never heard her voice in the ten years he's known her.

* TroublingUnchildlikeBehavior: Justified, in that she's a ghost [[spoiler:who was murdered through being used as a test subject for the Noumu project]].

* CatsAreMagic: Sort of. The ability to see ghosts is common to all cats in this universe, although not particularly magical. She does have a Quirk: she doesn't produce any kind of allergens, making her perfect for FuzzTherapy. She also seems to have an uncanny ability to be exactly where she is needed to perform FuzzTherapy without Izuku knowing, from the Sports Festival to the Forest Training Camp.
* EvilDetectingDog: No contact with villains so far, but upon meeting Endeavor she throws an impressively loud hissy fit that actually gets him to leave Todoroki alone.

* MysteriousAnimalSenses: Like all cats in this world, she is able to see ghosts.

[[folder:Bakugou Katsuki]]

* ButForMeItWasTuesday: Doesn't seem to recall the incident that traumatized Izuku enough to cause his first major bout of mutism. It's slightly ambiguous as to whether or not he really didn't remember or was trying to bluff his way out of the confrontation; if the latter, it blew up in his face when Izuku folds it into his [[TheReasonYouSuckSpeech call out]].
* HeelRealization: In a somewhat roundabout fashion. While watching Izuku's interactions with [[spoiler:their kidnappers]], Bakugou begins to suspect his bullying might have pushed Izuku past his limits and [[spoiler:into a FaceHeelTurn]]. He's none too pleased by the thought that he could be responsible for that.
* ItsAllAboutMe: Very used to thinking that everything revolves around him. Such as his belief that Izuku specifically means to spite him with his actions. However, this is actually contributing to his gradual realization of [[MyGodWhatHaveIDone the actual consequences of his behavior]].

* PlatonicLifePartners: He involves into this with Izuku. Both boys are {{asexual|ity}}, but develop a deep bond.

[[folder:The Big Three]]

* BigDamnHeroes: He shows up in the nick of time to save Izuku and Eri from [[spoiler:Mr. Compress.]]

[[folder:League of Villains]]
The main villainous team in both canon and YUTS.

* AdaptationalVillainy: [[spoiler:Dr. Tsubasa]] is All For One's personal doctor and a MadDoctor who converted his own grandchild into a Noumu.

* EvenEvilHasStandards: [[spoiler:Dr. Tsubasa]] may be the MadDoctor responsible for creating the Noumu, but even he is genuinely regretful over [[spoiler:failing to identify the presence of Izuku's Quirk, years ago.]]
* LongLostRelative: [[spoiler:Hino reveals that Dabi is a Todoroki.]]
* MadDoctor: [[spoiler:Dr. Tsubasa]], All For One's personal doctor. He is directly involved in the creation of Noumu and even converted his own grandchild into one.

* VillainRespect: Mr. Compress is impressed by [[spoiler:Eri]]'s willingness to [[TakeMeInstead sacrifice herself]] to protect Izuku.
* VillainTakesAnInterest: Shiragaki and All For One become interested in [[spoiler:Izuku]], even going so far as to have him kidnapped alongside Bakugo.
* VillainousCrush: Toga develops one on Izuku, even after [[spoiler:he breaks he nose and knocks her out.]]

[[folder:Shimura Nana]]

All Might's predecessor who died fighting the villain All for One. Now she follows All Might around as a ghost and acts as a second mentor to Izuku.

* MentorOccupationalHazard: To All Might, before she even had the chance to properly be a mentor.
* MyGreatestFailure: Nana sees her death as this, since it led to her not being able to train All Might.

* SatelliteCharacter: Since her death left her unable to meaningfully interact with the world, she settled into following All Might around, at least until she met Izuku.

* SpiritAdvisor: Though she tried to avoid doing this for Midoriya at first, because Midoriya is All Might's student and she felt that it'd be unfair to All Might since she couldn't teach him herself. The attack on the USJ causes her to change this stance and start helping teach Midoriya to protect himself in combat.

A ghost following Endeavor. He trails Shouto on his school trip and afterwards follows him on a more permanent basis.

* BigBrotherInstinct: He ''wanted'' to protect his sister from [[spoiler:Endeavor]], but died in a car accident. [[spoiler:He's grateful for all Izuku has done to save her.]]
* EveryoneHasStandards: He won't {{Troll}} Endeavor when the man's on the job. He won't endanger people's lives just for his own kicks.
* JerkWithAHeartOfGold: He hates Endeavor, but he won't do anything to his kids. [[spoiler:Of course, they're also his sister's kids, so that helps.]]
* MysticalWhiteHair: His hair's natural color is white, [[spoiler:just like his sister's.]]
* YouAreBetterThanYouThinkYouAre: He gives one to Izuku, urging him to [[spoiler:escape All for One's base when he's all but given up]].

[[folder:Other Ghosts]]

* FriendlyGhost: He's a good man who helps Midoriya when he gets [[spoiler:captured by All For One.]]
* HeroicMime: Was a sickly child, and between too many ear infections adding up plus getting the Quirk from All For One rendered him deaf.

* DarkAndTroubledPast: A poltergeist who [[spoiler:was an unwilling test subject for All For One's noumu experiments, suffering intense trauma at the hands of his scientists until she was rendered brain dead.]] It's such that she doesn't want to remember her past, preferring her new "life" as Rei.

* {{Poltergeist}}: [[spoiler:And unlike normal poltergeists who will typically revert to normal ghosts when they stop stressing out, Rei is like this permanently due to the intense trauma suffered from being a test subject for noumu experiments.]]

->''"Don’t take it personally. I lie to everyone."''

-->'''Izuku:''' You can still leave now. You don’t have to die here. I don’t want you to have to die. I get so little sleep as it is.

--> “My friends are scarier than you are.”\\
“Can’t skip leg day.”\\
“I lie to everyone.”\\
“I’m sorry. That must have been awful.”
* ChronicHeroSyndrome: Living or dead, Izuku can’t leave anyone who he can help.

* TheDarknessGazesBack: Midoriya's has [[https://en.wikipedia.org/wiki/Tapetum_lucidum tapetum lucidum]], which makes his eyes glow like a nocturnal animal's in the dark (which tends to scare his friends when they're not expecting him), and pictures of him tend to have glowing red eyes. [[spoiler:Dr. Tsubasa]] speculates it's a physical manifestation of his "invisible quirk."

* NervesOfSteel: Deconstructed. Izuku’s experiences with ghosts and Bakugou have left him with great skills at compartmentalizing.

* TheUnsmile: Izuku’s “baby-eating” grin, first seen during the USJ incident and popping up multiple times later, is caused by him [[StepfordSmiler forcing himself to smile]] while completely terrified.

** A side story details how ten-year-old Izuku got the bullies off his back after switching schools: [[spoiler: he worked three loose teeth out while his class was watching a movie, so that blood would pour from his mouth in the flickering projector light. The entire class panicked and later voted him “most likely to be possessed.”]]

Izuku’s best friend and CanonForeigner, Rei is a mute ghost who died under mysterious circumstances and considers Midoriya her 'little brother'. [[spoiler: Her real name is Morigawa Hitomi, and she was used as a test subject for the Noumu project before dying 30 years previously]].

* CanonForeigner: An original character developed for the sake of fleshing out Izuku’s Quirk and giving him a friend.

* CreepyGood: As Izuku’s friend, she helps him with whatever he needs, which usually includes helping other people.

* TheEmpath: Rei’s Quirk.

* SatelliteCharacter: Being dead, she doesn’t really have much to do except for following Izuku and helping him out.

* TroublingUnchildlikeBehavior: Justified, in that she’s a ghost [[spoiler:who was murdered through being used as a test subject for the Noumu project]].

* LittleStowaway: Sneaks her way into the training camp arc by hiding in Izuku’s luggage.

* ThisIsMyHuman: A chat with [[SpeaksFluentAnimal Koda]] in a side story reveals that "My Person" is her name for Izuku in cat language, with other favorites including "Warm Person" (Shouto), "Nap Person" (Aizawa), "Float Person" (Uraraka), and "Quiet Person" (Rei). She’s also protective enough to troll Bakugou[[note]]"[[NoIndoorVoice Shout Person]]"[[/note]] a bit by napping on his things, and is outright willing to ''bite'' Endeavour[[note]]"Hot Person"[[/note]] if he shows his face around the dorms.

* FriendlyGhost: She is a kind and friendly woman who mainly follows around her successor. She helps Modoriya learn hand-to-hand combat when she realizes

* SpiritAdvisor: Though she tried to avoid doing this for Midoriya at first because Midoriya is All Might's student and she felt that it'd be unfair to All Might since she couldn't teach him herself. The attack on the USJ causes her to change this stance and start helping teach Midoriya to protect himself in combat.

* OnlyKnownByTheirNickname: Much like All For One, he is only known by the name of his quirk: One For All.
* SpiritAdvisor: Being All For One's brother and hanging around him since death, One For All is knowledgeable of All For One and how he works.

* ThisIsMyHuman: A chat with [[SpeaksFluentAnimal Koda]] in a side story reveals that "My Person" is her name for Izuku in cat language, with other favorites including "Warm Person" (Shouto), "Nap Person" (Aizawa), "Float Person" (Uraraka), and "Quiet Person" (Rei). She’s also protective enough to troll Bakugou[[note]]"[[NoIndoorVoice Shout Person]]"[[/note]] a bit by napping on his things, and is outright willing to *bite* Endeavour[[note]]"Hot Person"[[/note]] if he shows his face around the dorms.

* ThisIsMyHuman: A chat with [[SpeaksFluentAnimal Koda]] in a side story reveals that “My Person” is her name for Izuku in cat language, with other favorites including “Warm Person” (Shouto), “Nap Person” (Aizawa), and “Quiet Person” (Rei). She’s also protective enough to troll Bakugou[[note]]"[[NoIndoorVoice Shout Person]]"[[/note]] a bit by napping on his things, and is outright willing to *bite* Endeavour[[note]]"Hot Person"[[/note]] if he shows his face around the dorms.

* TakeMeInstead: She asks Mr. Compress he can take her so long as he doesn't hurt Deku.

* LongLostRelative: [[spoiler:Hino reveals that Dabi is a Todoroki]].

* VillainTakesAnInterest: Shiragaki and All For One become interested in [[spoiler:Izuku]], going so far as to have him kidnapped alongside Bakugo.

->''"C’mon, just leave already. You’ll be back to full strength tomorrow and it’s not like anyone’s gonna believe him if he tells them he saw All-Might deflate like a sad muscly balloon animal."''

All-Might's predecessor who died fighting the villain All for One. Now she follows All-Might around as a ghost and acts as a second mentor to Izuku.

* AffectionateNickname: Calls Izuku “Sprout” and All Might “Toshi”.
* BodyHorror: [[spoiler: How she looked at death.]]

* DeadpanSnarker: Spends a lot of time keeping a running commentary on All Might’s (mis)adventures.
* DyingAlone: When Midoriya asks Gran Torino if he was there when she died he says no, nobody was.

* EveryoneHasStandards: He won't {{Troll}} Endeavor when the man's on the job. He won't endanger people's lives for his kicks.
* JerkWithAHeartOfGold: He hates Endeavor, but he won't do anything his kids. [[spoiler:Of course, they're also his sister's kids, so that helps.]]

* HeroicMime: Was a sickly child, and between too many ear infections adding up plus getting the quirk from All For One rendered him deaf.

** A side story details how he got bullies off his back after switching schools: [[spoiler: he worked three loose teeth out while his class was watching a movie so that blood would pour from his mouth in the flickering projector light. The entire class panicked and later voted him “most likely to be possessed.”]]

---

* HeterosexualLifePartners: With Amakigi.

%%---

%%[[folder:Eri]]
%%* TakeMeInstead: She asks Mr. Compress he can take her so long as he doesn't hurt Deku.
%%[[/folder]]

---

* ThisIsMyHuman: A chat with [[SpeaksFluentAnimal Koda]] in a side story reveals that “My Person” is her name for Izuku in cat language, with other favorites including “Warm Person” (Shouto), “Nap Person” (Aizawa), and “Quiet Person” (Rei). She’s also protective enough to troll Bakugou ("Loud Person") a bit by napping on his things, and is outright willing to *bite* Endeavour ("Hot Person") if he shows his face around the dorms.

* BigSisterInstinct: She feels very protective towards Izuku, who she thinks of as her little brother. Unfortunately, there's not much she can actually do to protect him [[spoiler:yet. It seems One For All is strengthening Midoriya's ISeeDeadPeople quirk, gradually making ghosts near him stronger to the point of being able to interact with people. She's eventually able to actively protect Midoriya by tackling Bakugou when he tried to attack him]].

Izuku's pet cat.

* ThisIsMyHuman: A chat with [[SpeaksFluentAnimal Koda]] in a side story reveals that “My Person” is her name for Izuku in cat language, with other favorites including “Warm Person” (Shouto), “Nap Person” (Aizawa), and “Quiet Person” (Rei). She’s also protective enough to troll Bakugou a bit by napping on his things, and is outright willing to *bite* Endeavour if he shows his face around the dorms.

* BigBrotherInstinct: He wants to thank Eraserhead is because the hero saved his sister from his killer.

** “My friends are scarier than you are.”
** “Can’t skip leg day.”
** “I lie to everyone.”
** “I’m sorry. That must have been awful.”

** Also [[spoiler:partially breaks his right wrist to free his hand and bites Himiko on the nose for his plan to free himself and Bakugou.]]

* UsefulNotes/SignedLanguage: Went through a phase as a child where he refused to talk, so he and his mother learned this so he could communicate. They not only find the skill useful for talking in stores without shouting (and in Midoriya's case help deaf people at the store when necessary), but [[spoiler:Midoriya uses to it communicate with both the original One for All wielder and All Might in front of the blind All For One]].

* ScrewThisImOutOfHere: He immediately leaves the room when the question of [[MistakenForRomance Izuku and Todoroki's relationship comes up]].

* EveryoneHasStandards: He also won't {{Troll}} Endeavor when the man's on the job. He won't endanger people's lives for his kicks.

!!Midoria Household

%%[[folder:Other Ghosts]]
%%[[/folder]]

!!Midoria Household]]

* TheDarknessGazesBack: Midoriya's eyes glow like a nocturnal animal's in the dark (which tends to scare his friends when they're not expecting him), and pictures of him tend to have glowing red eyes. WordOfGod has stated that Midoriya has [[https://en.wikipedia.org/wiki/Tapetum_lucidum tapetum lucidum]] that causes this. Chapter 39 has [[spoiler:Dr. Tsubasa]] state it in-story as well, and mentions it might have something to do with Midoriya's 'invisible quirk'.

* AdaptionalVillainy: [[spoiler:Dr. Tsubasa]] is All For One's personal doctor and a MadDoctor who converted his own grandchild into a Noumu.

* MadDocter: [[spoiler:Dr. Tsubasa]], All For One's personal doctor. He is directly involved in the creation of Noumu and even converted his own grandchild into one.

* CreepyChild
* CreepyGood

* GuileHero

* ISeeDeadPeople

* NiceGuy

* [[BigBrotherInstinct Big Sister Instinct]]: She feels very protective towards Izuku, who she thinks of as her little brother. Unfortunately, there's not much she can actually do to protect him [[spoiler:yet. It seems One For All is strengthening Midoriya's ISeeDeadPeople quirk, gradually making ghosts near him stronger to the point of being able to interact with people. She's eventually able to actively protect Midoriya by tackling Bakugou when he tried to attack him]].

* CreepyChild

* DeathAmnesia: Doesn't remember how she died or even her own name. [[spoiler:She also doesn't want to remember, as in her opinion noone cared for Hitomi, she was killed and noone cared. She only made friends and met Izuku as Rei, and prefers that.]]

* FriendlyGhost
* GhostAmnesia

* {{Poltergeist}}: [[spoiler: And unlike normal poltergeists who will typically revert to normal ghosts when they stop stressing out, Rei is like this permanently due to the intense trauma suffered from being a test subject for noumu experiments.]]

* SlasherSmile
* StringyHairedGhostGirl

!! Shimura Nana

->''"C’mon, just leave already. You’ll be back to full strength tomorrow and it’s not like anyone’s gonna believe him if he tells them he saw All-Might deflate like a sad muscly balloon animal."''

All-Might's predecessor who died fighting the villain All for One. Now she follows All-Might around as a ghost and acts as a second mentor to Izuku.

* AffectionateNickname: Calls Izuku “Sprout” and All Might “Toshi”.
* BodyHorror: [[spoiler: How she looked at death.]]
* CombatPragmatist: Is implied to have fought this way in life, and is teaching Midoriya the same thing.
* DeadpanSnarker: Spends a lot of time keeping a running commentary on All Might’s (mis)adventures.
* DyingAlone
* FriendlyGhost
* JacobMarleyApparel: Zigzagged. She usually wears a tank top, but, as with all ghosts, she reverts to how she looked at death while under extreme emotional turmoil.
* MentorOccupationalHazard: To All Might, before she even had the chance to properly be a mentor.
* MyGreatestFailure: Nana sees her death as this, since it led to her not being able to train All Might.
* ProphetEyes: Comes with the territory of being dead.
* SatelliteCharacter: Since her death left her unable to meaningfully interact with the world, she settled into following All Might around, at least until she met Izuku.
* SoProudOfYou: How she feels about All Might, and she regrets not being able to tell him so.
* SpiritAdvisor: Though she tried to avoid doing this for Midoriya at first because Midoriya is All Might's student and she felt that it'd be unfair to All Might since she couldn't teach him herself. The attack on the USJ causes her to change this stance and start helping teach Midoriya to protect himself in combat.
* UndignifiedDeath: Though it happened before the start of the story, [[spoiler: Izuku sees the results.]]

* FriendlyGhost

* UsefulNotes/SignedLanguage: Knows this from becoming deaf, and thus can 'speak' in front of All For One with Izuku due to All For One being blind.
* SpiritAdvisor: Being All For One's brother and hanging around him since death, One For All is knowledgeable of All For One and how he works.

* {{Poltergeist}}