History Fanfic / IsseiTheGamingGear

** The dungeon Issei goes in after meeting Asia is straight out of ''VideoGame/FinalFantasyIX'' (along with several ''VideoGame/{{Uncharted}} puzzles) because someone accidentally created it as part of a slapdash ritual combined with a pirated copy of the game.

* AdultFear:
** The very premise of the story is a madman breaking into the Hyōdō house and almost killing Issei in front of his parents. They are understandably reluctant to let him leave their sight for a week afterwards. [[spoiler:This is especially true if you know that Issei is actually the couple's only successful attempt at a child, having had two miscarriages prior to his birth.]]
** When he discovers Rias and Sona are very powerful Devils, Issei takes pain to hide his powers from them because some Devil Kings forcibly convert humans with huge potential into Devils to drag them into their Peerage as servants.
** [[spoiler:Asia, Murayama, Katase, Kiryū, Kiyome, and an unknown boy are kidnapped by the Purifiers in Kuō, who intend to experiment on them. Fortunately, Issei rescues them before anything happens, but one can only imagine what would have happened if he wasn't able to.]]

** Even with Gamer's Mind running wild on him, Issei still enjoys the sight of pretty girls.

* {{Chuunibyou}}: Issei pegs the Purifier scientist Tenkujo Arima as this when introducing his anti-Sacred Gear weapon Damocles.

* CovertPervert: Discussed. Issei notices that soon after he stopped peeking on the Kendo Club members with Matsuda and Motohoma, Murayama almost looked wistful at his absence whenever they crossed paths.

** At some point in time, someone discovered that [[spoiler:Kiry&#363]] had developed a subspecies Sacred Gear, and attempted to seal it away. Not only did they seal it improperly, allowing the Purifiers to learn [[spoiler:she]] had one at all, the seal, combined with [[spoiler:the trauma from being sexually assaulted]], diminished [[spoiler:her]] WIS stat by 10.

* ProperlyParanoid: Issei gives Asia a necklace with a tracking spell after he notices people following them on their not-date. They later turn out to be Purifiers out to kidnap Asia.

* RunningGag: During the incursion into the "Primordial Lair of the Ratmen", the air is so poisonous that Issei is constantly training Poison Resistance, which ticks him off as it slowly climbs to level 12.

* AdaptationalAngstUpgrade: Aika Kiryū was assaulted by a man shortly before starting to attend Kuō Academy, [[spoiler:which caused her to push her sealed Sacred Gear into subspecies status.]]

* HoldingBackThePhlebotinum: [[spoiler:Aika Kiryū has a Sacred Gear. Unfortunately, someone sealed it imperfectly, which prevented her from accessing it yet leaked enough energy to allow the Purifiers to detect it. Issei erases the seal at her request.]]

* PowerNullifier: Project Damocles has a feature that is ''supposed'' to disable Sacred Gears, but is so weak that Issei can counter it without even trying, and is sure that it wouldn't work much even against common Gears.

[[https://www.fanfiction.net/s/11862985/1/Issei-The-Gaming-Gear Issei: The Gaming Gear]] is a ''LightNovel/HighSchoolDXD'' FanFic that, like ''Fanfic/CodeGeassThePreparedRebellion'', ''Fanfic/ZeroNoTsukaimaSaitoTheOnmyoji'', and ''Fanfic/AfterTheChamberLordsAndLadies'', is a mix of AlternateUniverseFic and RationalFic written by [[https://www.fanfiction.net/u/4583733/SeerKing SeerKing]] that has elements from ''Webcomic/TheGamer''.

* MagicVersusScience: The Purifiers fall heavily on the magic side, of course, but Arima in particular ''hates'' anything remotely supernatural, viewing it as "superstition" despite the fact that it ''actually'' exists. He has an ''especially'' strong hate-on for Sacred Gear users. [[spoiler:In the end, thanks to Issei, magic wins out]].

* AdaptationNameChange: Due to the fact that she had NoNameGiven for the longest time, her real given name wasn't released until Shin [=DxD=] Volume 2, a good chunk of time after [=SeerKing=] decided to name her Yukariko.

** The first boss Issei faces is named Byral Warfang, a combination of the names of two rats from ''Literature/{{Redwall}}.

* ACupAngst: {{Downplayed}}. Sona is listed as having the "Mild Pettanko" trait, meaning that she has pretty much gotten over most of her envy towards large breasts, however, she is annoyed by people who state that BuxomIsBetter, like Issei which results in [[RelationshipValues in a reputation penalty with him]].

* YouthIsWastedOnTheDumb: Amongst all of Raynare's team, only she is over 200 years old and it shows with Mittelt at barely 75, Kalwarner at 150, and Dohnaseek at 185. And the latter two prove their incompetence by losing Asia to the Purifiers on what is supposed to be a milk run. Also, if Raynare and Milttet are to believed, they also pretty much [[SleepingTheirWayToTheTop slept their way into their positions]].

[[https://www.fanfiction.net/s/11862985/1/Issei-The-Gaming-Gear Issei: The Gaming Gear]] is a ''LightNovel/HighSchoolDxD'' FanFic that, like ''Fanfic/CodeGeassThePreparedRebellion'', ''Fanfic/ZeroNoTsukaimaSaitoTheOnmyoji'', and ''Fanfic/AfterTheChamberLordsAndLadies'', is a mix of AlternateUniverseFic and RationalFic written by [[https://www.fanfiction.net/u/4583733/SeerKing SeerKing]] that has elements from ''Webcomic/TheGamer''.

* DetectEvil: Both Kiba and Koneko are able to sense the evil nature of the Dagger of the
Draugar.

** "Shakkomon the Divine Metal Dogu", [[spoiler: the first floor Boss of Issei's base that the Stray Exorcists encounter while attempting to retrieve Asia,]] is a reference to the mutant Digimon from [[Anime/DigimonAdventure02 Digimon Adventure 02]], right down to it's name and description of appearance, as can be seen [[https://digimon.fandom.com/wiki/Shakkoumon here]].

* AdaptationalEarlyAppearance: Abe Kiyome (the third-year Beast Tamer) and Aika Kiryū (Issei's female pervert classmate) appear in Chapter 15 [[spoiler:after being kidnapped by the Purifiers in Kuō]], while in canon their first appearance was after the Rating Game against Riser Phenex.

* ACupAngst: Downplayed, Sona is listed as having the "Mild Pettanko" trait, meaning that she has pretty much gotten over most of her envy towards large breasts, however, she is annoyed by people who state that BuxomIsBetter, like Issei which results in [[RelationshipValues in a reputation penalty with him]].

* AdaptationalRelationshipOverhaul:
** Issei becomes friendlier with Murayama and Katase, as well as Aika Kiryū, due to his Character Development. Aika also decides to begin dating Issei some time after her kidnapping.
* AdaptationNameChange: Due to the fact that she had NoNameGiven for the longest time, her real given name wasn't released until Shin [=DxD=] Volume 2, a good chunk of time after [=SeerKing=] decided to name her Yukariko.

* CliffHanger:

* CovertGroupWithMundaneFront: The main Purifier base in Kuoh is disguised as a factory compound belonging to a sewage system repair company called "Pure Drains".

* CripplingOverspecialization: [[spoiler:Raynare is confident that she can take Freed out if needed, noting that the insane man's skills are hyper-focused on fighting Devils, not Angels, Fallen, or otherwise]].

* DetectEvil: Both Kiba and Koneko are able to sense the evil nature of the Dagger of the Draugar.

* ITakeOffenseToThatLastOne: When Issei calls the Purifiers [[spoiler:that want to kidnap Asia]] "suspicious old men in cosplay", three of them seem to be more affronted about the suspicious, old, and cosplay parts than the fact that Issei pretty much implied [[PaedoHunt something else]].

* LazyAlias: The Purifier main base in Kuoh disguises itself as a sewage system repair company called "Pure Drains". More than one character remarks on how obvious/unsubtle it is.

* {{Masquerade}}: While the masquerade is broken for Kiryū, Murayama, and Katase; the girls are quickly told they must keep it up for others due to it being the one thing that all mythologies hold in agreement.
* MamaBear: Mrs. Hyōdō was not amused when [[CassandraTruth the staff at Kuoh Academy didn't believe Issei]] about their recent home invasion being the reason for missing a week off school, not that it isn't completely unjustified, and makes her displeasure known. Even Sona was rather impressed by it, and the Gamer's Gear actually seems a bit intimidated.

* NoOSHACompliance: When Issei sees that the Purifier base has a dissection table covered in blood in clear view of the cell with prisoners in it as an intimidation tactic, he notes that it ''cannot'' be sanitary by anyone's standards.
* OhCrap: Issei gets one when it's revealed that Agent Flamberge of the Purifiers is [[spoiler:Armârôs the FallenAngel, and is ''double'' Issei's current level]].

* SamusIsAGirl: [[spoiler:Flamberge turns out to be a female Fallen]].

* SecretIdentity: Since the "Ratcatcher" was always gone before her arrival or masked in her presence, Rias has no idea that Issei is actually him. Likewise, no one is aware of his true identity thanks to Issei donning armor and masks when meeting with others, the most anyone knowing about him being that he goes to Kuoh Academy and that he's the Gaia Gamer Gear wielder. He eventually buys a magic mantle that hides his magical presence. [[spoiler:The only one who even knew he had two Sacred Gears, Armârôs, took that knowledge with her to her grave once Raynare killed her.]]

* WeHaveReserves: Besides the element of surprise, the Ratmen's main advantage is their easily replaced numbers. After Issei kills the Breeder, this only brings the end of their species closer.

* RunningGag: During the incursion into the "Primordial Lair of the Ratmen", the air is so poisonous that Issei is constantly training Poison Resistance, which ticks him off as it slowly climbs to level 8.

** "Shakkomon the Divine Metal Dogu", [[spoiler: the first floor Boss of Issei's base that the Stray Exorcists encounter while attempting to retrieve Asia,]] is clearly a reference to the mutant Digimon from [[Anime/DigimonAdventure02 Digimon Adventure 02]], right down to it's name and described [[https://digimon.fandom.com/wiki/Shakkoumon appearance]].

** "Shakkomon the Divine Metal Dogu", [[spoiler: the first floor Boss of Issei's base that the Stray Exorcists encounter while attempting to retrieve Asia,]] is clearly a reference to the mutant Digimon from [[Anime/DigimonAdventure02 Digimon Adventure 02]], right down to it's name and described appearance. See [[https://digimon.fandom.com/wiki/Shakkoumon here]].

** "Shakkomon the Divine Metal Dogu", [[spoiler: the first floor Boss of Issei's base that the Stray Exorcists encounter while attempting to retrieve Asia,]] is clearly a reference to the mutant Digimon from [[Anime/DigimonAdventure02 Digimon Adventure 02]], right down to it's name and appearance described by the author. See right [[https://digimon.fandom.com/wiki/Shakkoumon here]].

** "Shakkomon the Divine Metal Dogu", [[spoiler: the first floor Boss of Issei's base that the Stray Exorcists encounter while attempting to retrieve Asia,]] is clearly a reference to the mutant Digimon from [[Anime/DigimonAdventure Digimon Adventure]], right down to it's name and appearance described by the author. See right [[https://digimon.fandom.com/wiki/Shakkoumon here]].

** "Shakkomon the Divine Metal Dogu", [[spoiler: the first floor Boss of Issei's base that the Stray Exorcists encounter while attempting to retrieve Asia,]] is clearly a reference to the monster from [[Anime/DigimonAdventure Digimon Adventure]], right down to it's name and appearance described by the author. See right [[https://digimon.fandom.com/wiki/Shakkoumon here]].

** "Shakkomon the Divine Metal Dogu", [[spoiler: the first floor Boss of Issei's base that the Stray Exorcists encounter while attempting to retrieve Asia,]] is clearly a reference to the monster from [[Anime/Digimon Adventure Digimon Adventure], right down to it's name and appearance described by the author. See right [[https://digimon.fandom.com/wiki/Shakkoumon here]].