History Fanfic / ANinjasGuideToGotham

** In chapter 20, this finally slams directly into Jason's antipathy for the Robin role when Hayate brings an unconscious Tim to him to ask for medical help. After an internal struggle, Jason decides his principles override his grudge and breaks out the antidotes. After learning that Kei and her friends are also underage and that their world has a ''systemic'' ChildSoldier problem, he reluctantly puts aside his

** Kei doesn't trust anyone in Gotham, so she avoids giving Batman, Nightwing, or Robin much information about who she is or what her motivations are. She only seeks them out when Red Hood specifically pays her to and when she's already worn down by being constantly pursued by Ra's Al Ghul's assassins. Kei also knows precisely who the mysterious Red Hood is, and has no intention of revealing that information to the Batclan (whose identities she also knows) directly. She only has the information because she's a transmigrator, which she can't explain.

* KillingIntent: Despite being {{Badass Normal}}s, the Bats are actually fairly sensitive to this, which lets them easily detect when Kei is feeling combative or when [[AnimalisticAbomination Isobu]] is acting up. Obito's is also intense when he's "interrogating" a League assassin, but feels entirely human.

** Kei is fully bilingual with a strong accent, so she doesn't have to deal with this. Other characters do note the gap between her vocabulary and her accent, though, and it ends up being yet another tally mark in the "weird" column. Kei admits to Isobu that she has something of a tin ear for languages outside of those two, though, and has to get translation help when dealing with the League of Assassins in the earlier encounters.

* NoBadassToHisValet: After an uncertain first meeting, Hayate doesn't fear Jason in the slightest. This despite knowing about the rise of the Red Hood's violence and notoriety in Gotham and being fully aware that he's a mob boss who can and does kill anyone who breaks his rules. Jason even tries to point this out to Hayate a few times, only to be met with a shrug. Instead, he worries that Jason is passively suicidal in the pursuit of his goals. Kei and her friends, who also treat Red Hood casually, at least have the advantage of being many times more dangerous than he is.

** This is one of the few ways to immediately kill a Zetsu clone, because it's a holdover from when they were ordinary humans. Otherwise, their anatomy is more plantlike than human. Kei and Hayate immediately resort to this method, while Dick takes a little longer to get with the program.

* DoubleTap: Shinobi have to resort to this when dealing with Zetsu clones once they reveal themselves and [[ZergRush attack en masse]]. Otherwise, as Dick found out, they have a nasty tendency to regenerate and keep up the fight. Hayate and Kei take a vicious satisfaction in finishing off these opponents because Swirly Zetsu killed their mother two years ago.

* DoubleTap: Shinobi have to resort to this when dealing with Zetsu clones once they reveal themselves and [[ZergRush attack en mass]]. Otherwise, as Dick found out, they have a nasty tendency to regenerate and keep up the fight. Hayate and Kei in particular take a vicious satisfaction in finishing off these opponents because Swirly Zetsu killed their mother two years ago.

* ConcealmentEqualsCover: Subverted for a League assassin, cornered in a spare room by the Red Hood. With the advanced HUD in Jason's helmet and his intuition, Jason easily shoots through the wall and hits the man in the leg.

* CrapsaccharineWorld: The broader DCU and the ''Naruto'' setting are both this, but in different flavors. While one has the occasional alien invasion that threatens to drive humanity extinct or rewrite reality (along with endemic supervillain threats like the Joker), the other has the veneer of respectable circa-1980s Japanese culture plastered over a barely-not-feudal society with superpowers.

* DontMakeMeDestroyYou: Despite being far outside the weight class of anybody else in Gotham, Kei has little interest in actually fighting. She instead tries to escape the attention of the League of Assassins, and even when cornered, she yells at them to go away before subduing them and then running again. When given a ''reason'' to about-face and turn an appreciable fraction of her power on her opponetns, she [[CurbStompBattle immediately beats them into the ground]].

* KillingIntent: Despite being {{Badass Normal}}s, the Bats are actually fairly sensitive to this, which lets them easily detect when Kei is feeling combative or when [[AnimalisticAbomination Isobu]] is acting up.

** Jason's trauma, of course, centers on the circumstances of his death. Hayate notes that he ''can't'' think about the future past his impending confrontation with Batman and the Joker, and seems to dissociate when the subject otherwise comes up.

** In chapter 20, this finally slams directly into Jason's antipathy for the Robin role when Hayate brings an unconscious Tim to him to ask for medical help. After an internal struggle, Jason decides his principles override his grudge and breaks out the antidotes.

* Chapter 25: Obito lets Kei, Hayate, and Jason know he picked up English from the League ninja he killed, and Kei tells Tim about Damian's existence as soon as she works it out as the most likely option.

* Chapter 25: Obito lets Kei know he picked up English from the League ninja he killed, and Kei tells Tim about Damian's existence.

* SecretIdentityVocalShift: It's noticed early on that Jason's Red Hood helmet includes some kind of vocal scrambler that makes his voice sound somewhere between a robot and [[Franchise/StarWars Darth Vader]]. It's just one of the ways he hides his identity from the Bat-clan for so long.

** Kei and Jason are both dangerous teenage fighters who are willing to resort to lethal force, and their protective instincts are focused on the same kid. Kei is a PersonOfMassDestruction, but she chooses to fight without killing in Gotham to keep a lower profile. Jason, meanwhile, is a BadassNormal putting together enough resources to become a crime lord to rival Black Mask and doesn’t especially care how many bodies are left in his wake. Both of them also have contrasting relationships with the League of Assassins, with Kei as a target and Jason having been trained by them. Also, while Jason has no way of knowing this, Kei (probably) [[MediaTransmigration also died and woke up in a world she recognized]], but was reborn as a baby and has no way of connecting to her old life, and so gave up on it entirely. Jason, by contrast, is constantly haunted by his death and revival experiences.

** Jason tries to hide his criminal dealings from Hayate, but quickly discovers that Hayate is both aware of how gangs work and can escape Jason’s security measures whenever he feels like it, which lets him roam Gotham at will. That said, he doesn’t know Jason’s real name, despite living in his apartment for the better part of a month.

* SecretIdentity: Several, since Gotham’s one of the most famous superhero story settings of all time. Besides the Batfamily, Kei chooses the vigilante moniker “Genbu” and Hayate (entirely coincidentally) chooses “Suzaku.”

* VocalDissonance: Jason is more than a little weirded out to find that Pakkun a) can talk and b) has the voice of a middle-aged man.

** Kei snaps even at allies at the thought of Hayate being hurt or dying, and people around her are usually informed of the impending danger by the sudden burst of KillingIntent. As she's forced to admit to the Bats, she's had recurring nightmares of Hayate's [[{{Manga/Naruto}} canon death]] since she was a child and cannot stop worrying about it.

** Kei snaps even at allies at the thought of Hayate being hurt or dying, and people around her are usually informed of the impending danger by the sudden burst of KillingIntent. As she's forced to admit to the Bats, she's had recurring nightmares of Hayate's [[{{Manga/Naruto canon death]] since she was a child and cannot stop worrying about it.

** Kei’s drive to protect Hayate has made her more moody and desperate the longer she’s separated from him. Seeing as Kei is a jinchūriki, her long fuse is attached to a much larger bomb than most people’s. Whenever the possibility of Hayate being harmed is brought up, other characters are bluntly informed that Kei might become extremely violent in response if they don't figure it out immediately. At one point, Kei admits she can't relate to Nightwing because, when the Joker killed the second Robin, the Bats ''let him live.''

** Jason believes that Kei, as Hayate's nominal guardian, is responsible for his ChildSoldier status. He's thrown when he realizes she ''isn't'' ConditionedToAcceptHorror the way that Hayate is and is far more culturally adept than her brother. From an outsider's point of view, the knowledge Kei retains as a MediaTransmigrator (and Hayate doesn't share at all) looks like a case of neglect so strange and thorough that it makes no sense.

* AdaptationalVillainy: In the film, Ra's al Ghul serves only as TheAtoner and MrExposition about Jason's revival and subsequent rampage. In this story, Konoha shinobi observing Gotham theorize as early as chapter 5 that Ra's al Ghul is one of the driving forces behind Kei and Hayate's inter-world kidnapping, even if they don't know his name or his motives. His assassins stalk Kei across Gotham and repeatedly drive her out of hiding places, even using firebombs, and are the only people on the Gotham side of the story who are aware of her [[SealedInAPersonShapedCan demon possession status]] without being told.
* AlienBlood: Even when disguised as ordinary humans, Zetsu clones don't so much bleed as ''ooze'' when injured, and the substance is an off-white goo more than a liquid. Anyone who fights them at close range ends up covered in it.

** Kei’s natural drive to protect Hayate has made her more moody and desperate the longer she’s separated from him. Seeing as Kei is a jinchūriki, her long fuse is attached to a much larger bomb than most people’s. Whenever the possibility of Hayate being harmed is brought up, even other characters realize that Kei might become extremely violent in response. At one point, Kei even notes she can't relate to Nightwing because, when the Joker killed the second Robin, the Bats ''let him live.''
** In Jason's case, his WouldNotHurtAChild policy is invoked upon his and Hayate’s first meeting, which results in Red Hood taking an injured young ninja under his wing. Even before they know each other's names, Jason fights and kills twenty other gangsters in response to a kid being shot on his watch.

* CantDefaultToMurder: Unsurprisingly for a shinobi of her era and power level, Kei has a body count and isn't especially concerned about adding to it while on missions. While in Gotham, however, Kei does her best to avoid killing anyone directly, because she realizes that leaving a trail of bodies around the city would draw undue attention and probably get her on Batman's bad side. This doesn't stop the League of Assassins and her allies in Konoha from racking up killcounts behind her back, for different reasons.

** Kei is also this, but no one wants her to reach the point where she has to demonstrate it. Happens anyway in chapter 19, when she nearly singlehandedly slaughters the Zetsu clones that square up against her and causes not-insignificant property damage in the process.

* PersonOfMassDestruction: Kei, which is even more dangerous in a city with as many people as Gotham. The only person Hayate tells about this is Jason, who has MobWar to manage and a ResurrectionRevenge plot to carry out. It takes until Kei hits her personal boiling point for her to actually explain this to the Bats. When she does actually fight, Kei either orders less-durable allies to leave the fight or has to use barriers to limit the damage done, and only then can actually focus on her enemy.

** In an effort to avert this going forward, Stephanie and Tim visit Kei and hash out the major concerns of the situation in Gotham over a late-night snack.

* TheresNoPlaceLikeHome: Kei's ultimate goal. Holding herself aloof from the conflicts of the story, her only real goal is to go home with her brother and probably never have to think about Gotham ever again. While Hayate does share this goal, he's much more willing to get involved in Gotham's chaotic elements because they're interesting.

* TrappedInAnotherWorld: What this story is from Kei and Hayate’s perspective. Given that both Gotham and Konoha are extremely weird from the other’s perspective, it’s a fair enough read.

* WalkingTechbane: Hayate has a brush with this trope. While he adapts quickly to his phone when given one, his primary nature transformation is [[ShockAndAwe Lightning Release]]. As a result, a bit of carelessness on his part fries everything electronic on Tim's Robin costume at the end of their first meeting.

* WouldNotHurtAChild: Jason’s ironclad policy within his territory, which is the main difference between his gang’s behavior before and after his takeover. He hates those who target children more than any other class of criminal. When it comes to dealing with the ninjas in Gotham, he's furious at the idea of ChildSoldiers and absolutely refuses to let Hayate follow him around as a sidekick. It’s also what gets him stuck looking after Hayate in the first place, because he’s unwilling to put Hayate into the hands of any of the corrupt authorities in the city.

* DoubleTap: Shinobi have to resort to this when dealing with Zetsu clones once they reveal themselves and [[ZergRush attack en mass]]. Otherwise, as Dick found out, they have a nasty tendency to regenerate and keep up the fight. Hayate and Kei in particular take a vicious satisfaction in finishing off these opponents because Swirly Zetsu killed their mother three years ago.

** While Hayate is aware that Jason has seriously conflicted feelings about the Batfamily thanks to his status as TheEmpath, he isn’t been able to pry the reason out of him at first. As a result, Hayate accidentally explains a fair bit about Red Hood’s personality and policy to Tim, after catching him attempting a preliminary investigation into Crime Alley.

* ExtraDimensionalShortcut: Obito's access to Kamui allows him to do this, forming portals with his body as a medium. One of the more frustrating parts of the WeirdnessSearchAndRescue troubleshooting (see below) was that Obito ''couldn't'' immediately solve the problem with this method. After arriving in Gotham, he admits to Kei and his team that the arrays that allowed him to stretch his technique far enough to reach the city are broken, which means they're now trapped together.

* ConcealmentEqualsCover: Subverted for a League assassin, cornered in a spare room by the Red Hood. With the advanced HUD in Jason's helmet and his intuition, Jason easily shoots the man in the leg to subdue him.

* SwitchingPOV: Aside from Kei's usual focus, other POV characters include Hayate, Jason, Dick, Tim, Steph, and Kakashi.

** While Hayate is aware that Jason has seriously conflicted feelings about the Batfamily thanks to his status as TheEmpath, he hasn’t been able to pry the reason out of him. As a result, he accidentally explains a fair bit about Red Hood’s personality and policy to Tim, after catching him attempting a preliminary investigation into Crime Alley.

** Kei is fully bilingual with a strong accent, so she doesn't have to deal with this. Other characters do note the gap between her vocabulary and her accent, though, and it ends up being yet another tally mark in the "weird" column. In her own words, she has something of a tin ear for languages outside of those two, though, and has to get translation help when dealing with the League of Assassins in the earlier encounters.
** It's noted that when watching the footage of Dick interviewing Hayate and Kei, Bruce has to correct the auto-generated subtitles for the sake of the official record. While Bruce, Dick, and Jason are fluent in Japanese, Tim (whose only non-European language is Cantonese) and Steph are not.

** Obito, a Mangekyō Sharingan user, can spot a similar pattern due to being present when Konoha spies on Gotham using a crystal ball and observing the Bats in action. After a second of thinking about it, he also ties Red Hood to the same MasterApprenticeChain based on their acrobatic movements.

** Kei and Hayate’s circumstances are constantly contrasted. While Kei landed in Gotham with some idea of how to survive in a modern city, she’s beset by circumstantial difficulties and the League of Assassins. Hayate, meanwhile, was immediately scooped up by an up-and-coming mob boss who WouldNotHurtAChild and is on vacation by comparison.
** Hayate and Tim are respectively a NinjaBrat and a TeenGenius vigilante, and they have very different moral standards despite being nearly the same age. Tim is appalled by Red Hood’s rise to power, while Hayate approves of or at least accepts his methods.
** Kei and Jason are both dangerous teenage fighters who are willing to resort to lethal force, and their protective instincts are focused on the same kid. Kei is a PersonOfMassDestruction, but she chooses to fight without killing in Gotham to keep a lower profile. Jason, meanwhile, is a BadassNormal putting together enough resources to become a crime lord to rival Black Mask and doesn’t especially care how many bodies are left in his wake. Both of them also have contrasting relationships with the League of Assassins, with Kei as a target and Jason having been trained by them.
** Jason realizes this about himself and Obito. While Jason actually did die and was resurrected later, Obito was presumed dead for half a year after Kannabi. While Jason's death and revival was a traumatic experience in basically every way and he's still defined by his resentment of everyone involved, Obito appears unaffected by his trials. And unlike the Bat-clan, who [[ThouShaltNotKill refuse to take revenge for Jason]], Obito's attackers "probably didn't last five minutes." Jason is disgusted with himself for being envious of that, because he knows it's a product of [[CrapsackWorld the terrible world they come from]].

** Kei picks the mask name Genbu as an inside joke because she’s wearing mostly black clothes and an ANBU mask designed to look like Isobu’s face. It sticks.

** Later on, Seiryū and Byakko are taken by Obito and Kakashi, respectively, but this time it's done intentionally to keep up the trend. Rin chooses the name Kirin, which also follows this pattern.

** This is one of the few ways to immediately kill a Zetsu clone, because it's a holdover from when they were ordinary humans. Otherwise, their anatomy is more plantlike than human.

** Multiple characters (particularly Steph, Tim, and Jason) note that Kei has a bad habit of lying by omission as a strategy for avoiding conflict, so when Tim attempts to confront her about the holes in her story, he has a hard time believing what she says even when she's trying to tell him about [[StealthyMook Zetsu clones]].

** Much later, Kakashi finds blood and ink on a League ninja uniform. With the help of the Bats' forensics kits, they all confirm that the enemy is tracking Kei through fuinjutsu.

** Kei and Jason are both dangerous teenage fighters without a no-kill policy, and their protective instincts are focused on the same kid. Kei is a PersonOfMassDestruction, but she chooses to fight nonlethally in Gotham to keep a lower profile. Jason, meanwhile, is a BadassNormal putting together enough resources to become a crime lord to rival Black Mask and doesn’t especially care how many bodies are left in his wake. Both of them also have contrasting relationships with the League of Assassins, with Kei as a target and Jason having been trained by them.