[[quoteright:297:http://static.tvtropes.org/pmwiki/pub/images/High_School_DxD_Volume_1_9309.jpg]]
[[caption-width-right:297:LightNovel, first volume. Pictured (from left to right): [[HairOfGoldHeartOfGold Asia]] [[RaisedCatholic Argento]], [[HaremSeeker Hyodo]] [[ChivalrousPervert Issei]], [[TeamMom Rias Gremory]].]]

->'''Rias:''' My name is Rias Gremory, and I'm a Devil.\\
'''Issei:''' A devil?!\\
'''Rias:''' Not only that, but I'm your master too. You're mine now. Nice to meet you, Issei Hyoudou.

''High School D×D'' is an ongoing (since 2008) LightNovel series, currently at twenty volumes, written by Ichiei Ishibumi, illustrated by Miyama-Zero and published by Fujimi Shobo that has been adapted into a manga (with a LighterAndSofter SpinOff titled ''Asia and Koneko's Secret Contracts'') and a popular anime produced by TNK which is continuing with a fourth season scheduled for 2017. The series is well-known for mixing {{fanservice}} with a compelling story and developed characters. A ''[[LoadsAndLoadsOfCharacters lot]]'' of characters, with many of those based on almost all religions and mythologies. It can be best summed up as a [[XMeetsY mix-and-stir]] of ''Manga/ToLoveRu'' and ''Franchise/ShinMegamiTensei''.

Our hero, [[TheHero Issei]] [[LovableSexManiac Hyoudou]], is a second-year student at the prestigious mostly-girls school Kuoh Academy. One day, he is asked out by a girl named Yuuma Amano. Having never had a girlfriend before, he accepts. The date goes well... until Yuuma reveals herself as a Fallen Angel, [[ImpaledWithExtremePrejudice stabs Issei through the stomach]] and leaves him to die. Luckily, [[MagicalGirlfriend Rias Gremory]], the school's [[MsFanservice beautiful]], [[RedIsHeroic crimson-haired]] sweetheart, and high-class Devil finds him and resurrects him to act as [[MistressAndServantBoy her servant Devil]] and work for her and three other Devil students in the school's Occult Research Club.

The anime is licensed by Creator/{{FUNimation}} for an English-language release. Two licensed games have also been made, one for the Nintendo3DS, based on the anime's first season, and one (free-to-play and digital only) for the UsefulNotes/PlaystationVita, instead based on the anime's second season. Unfortunately [[NoExportForYou these two games won't seem to see the light of the day overseas anytime soon.]]

The series also has a prequel, called ''SLASH/DOG'', which was actually started before ''[=DxD=]'' but published after the latter's success, and a spin-off called ''[=DxD=] EX''.

Not to be confused with ''LightNovel/DakaraBokuWaHGaDekinai'' (which started airing an anime around the same time with a similar red-haired MagicalGirlfriend), or the similarly-named ''Manga/HighSchoolOfTheDead'' and ''Manga/ShinjukuDxD''. Has an in-progress [[Recap/HighschoolDxD Recap page]].

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!!''High School D×D'' provides examples of:

[[foldercontrol]]

[[folder: Tropes A to D]]
* AccidentalPervert:
** Generally there's nothing accidental about the situations Issei gets caught in, but that time his mom found him sleeping naked next to Rias was totally innocent.
** Also, when the girl's kendo team catches him next to a hole in the wall of the girl's changing room, he actually ''hadn't'' been peeping. Not that he didn't ''want'' to, though.
* ActionGirl: So far, almost all female devils (except [[TheMedic Asia]]) are pretty good at ass-kicking anyone with either physical or magical attacks. Crosses over with DamselInDistress much of the time, though, with DefeatByModesty a major plot point.
* ActualPacifist: Asia has absolutely no way to deal damage or hinder enemies in combat. She just has the series most powerful healing ability and later becomes a Stone Wall with her Fafnir armor.
* ACupAngst: [[http://www.mangareader.net/highschool-dxd/2/72 Koneko]]
** Becomes a plot point in the first OVA. A demon creates a plant that gives girls big breasts. Issei, being the pervert that he is, actually tries standing up for the monster, thinking that maybe big breasts aren't all bad. Koneko, on the other hand, has a huge BattleAura, and has a gigantic tree trunk over her head, ready to take that thing out., just condensed and with some rather major divergences.
* AdaptationDistillation: Subverted with the third anime season, ''[=BorN=]''. The season is essentially an adaptation of volumes 5 through 7, just condensed and with some rather major divergences, especially in the second half. It also included heavy involvement from [[WordofGod Ichiei Ishibumi]], who set up the season as the basis for his ''EX'' spin-off light novels and turning part of that season into an AlternateContinuity.
* AdaptationalModesty: The manga greatly cuts down the frequency of nipples displayed. For that matter, breasts are also smaller.
* {{Adorkable}}: Issei, natch.
* AdultsAreUseless: Averted. The adults are ''a lot'' more competent than the children in this series.
* TheAlliance: The Christian faction as a whole (includes angels, fallen angels, and devils).
* AllJustADream: The 2nd special episode where Issei has an erotic dream of Akeno giving him a private lesson. Upon waking up, he finds himself hugging Asia, which prompts an angry response from Rassei.
* AllLovingHero: Archangel Michael. He's really deserving of his title.
* AllMenArePerverts: We start with Issei of course, but he's definitely ''not'' the most perverted guy ever. The only male character who doesn't seem to even be remotely close as a pervert is [[spoiler: ironically Vali, his rival.]]
* AllMythsAreTrue: The Greek and Norse are confirmed in the novels. Heroes such as King Arthur and Cao Cao are featured as well. [[BerserkButton Telling it to the chief gods of those myths that "they're just myths" isn't exactly going to end well though.]]
* AllWomenAreLustful: While Issei is well known for his sex drive, there are many, many situations initiated by the girls in which even he is taken aback.
* AllYourBaseAreBelongToUs: In Volume 4, Katerea's forces invade Kuoh Academy during the meeting between the Three Factions.
* AlmightyJanitor: Issei himself is this seeing as Rias had to use all 8 of her pawn chess pieces to even have him as a servant. Saji is also this to a lesser degree.
* AlternateTimeline: In ''EX'', Loki goes back in time with the Underworld Lifeforms and creates this by making Chichigami an UnPerson and cursing Asia, leading to the events of ''[=BorN=]''.
* AmazinglyEmbarrassingParents: Plus older siblings, when they show up on Class Inspection Day. To give you an idea, [[TheStoic Sona's]] older sister [[NamesToRunAwayFromReallyFast Serafall Leviathan]], one of the four demon overlords, shows up {{cosplay}}ing as a MagicalGirl (from the ShowWithinAShow) and acting like a young ditzy teen, much to the former's embarrassment. Rias's father also takes some embarrassing footage of her in class, and shows it to Issei's parents during the same arc. And ''then'', judging from how his parents act... No wonder Issei is so perverted.
* AnotherDimension: All rating Games take place in one as well.[[spoiler: Cao Cao traps the group in one in Volume 11 as well.]]
* AnyoneCanDie: Several characters get killed off over the course of this series, most notably:
** The Red Dragon Emperor's Awakening: Viser, and Raynare & her allies (Mittelt, Karawarner and Dohnaseek).
** Birth of the Breast Dragon Emperor: Valper Galilei, Freed Sellzen, Diodora Astaroth, and most of the Old Satan Faction's leaders (Katerea Leviathan and Creuserey Asmodeus).
** The Heroic Oppai Dragon: [[spoiler:Pluto, Shalba Beelzebub, and the Old Satan Faction as an entity]].
** The Legend of Oppai Dragon and his Lively Companions: [[spoiler:Marius Tepes, Yamata no Orochi, Masaomi Yaegaki, Nidhöggr, Rizevim Livan Lucifer, Apophis and Azi Dahaka]].
* TheArmiesOfHeaven: While they don't exactly do much fighting, the angels do have a large military presence in the series.
* ArsGoetia: The 72 Pillars of pure-blooded devils have their last names taken from it. Gremory and Phenex are known examples.
* ArtisticLicenseReligion:
** [[WordOfGod Ichiei Ishibumi]] said that he already knows that there are different types of the Christian religion. Ishibumi still made it all in one to minimize the hassle.
** The nature of demons, angels, and all other divine beings have been completely rebuilt to be applicable to a shonen series.
* AscendedDemon:
** Subverted with Asia. Even after becoming a devil, she is still very devout and attempts to pray and read the Bible frequently. However, she is always stopped midway by sharp headaches that emerge as a result of devils not being allowed near the presence of God. [[spoiler:She along with Xenovia are eventually allowed to worship freely again after Issei asks Archangel Michael to give them permission post the three factions uniting in peace.]]
** Happens with [[spoiler:Xenovia]] as well, even after it is revealed that [[spoiler:the original God died in the last war.]]
* AsLethalAsItNeedsToBe: Kiba's Sword Birth only seems to be effective against mooks, that is when he actually uses it.
* AuthorityEqualsAsskicking: If you are a leader of a faction, one of the minimum requirements is that ''you have to kick ass''.
* AxCrazy:
** Freed goes absolutely nuts with his sword.
** Shalba Beelzebub is arguably even worse.
* BackFromTheDead:
** Issei is killed by Raynare, a Fallen Angel, in the first episode, but is revived by Rias as a devil.
** [[spoiler:Asia is also killed by Raynare halfway through the first season when the latter steals her Sacred Gear. She too is revived by Rias as a Bishop.]]
** [[spoiler:This happens to Issei again after being "killed" in Volume 11.]]
* BadassAdorable: The girls may look beautiful but most of them are strong enough to easily destroy buildings.
* BadassArmy: Take all of the crew mentioned below in BadassCrew plus the Heaven's Brave Saints squad, use Executive order to form a special counter-terrorist task force, and you get the SOCOM-esque [=DxD=] team. Azazel, Sirzechs, and Michael even plan on making a JSOC version, codenamed "[=ExE=]"
* BadassCrew: You have the Occult Research Club, Khaos Brigade's Vali Team, the Kuoh Student Council, Sairaorg's team, and then there's [[spoiler: Khaos Brigade's Hero Faction.]]
* BadassFamily: The Gremory family. When you've got the Crimson-Haired Ruin Princess (Rias), the Silver-Haired Queen of Annihilation (Grayfia), and the Brunette Madame of Extinction (Lady Gremory) gunning for you, you might wanna run away pretty fast.
* BadassNormal: Sairaorg lacks any special power but trained his [[CharlesAtlasSuperpower body]] hard enough that he can defeat any of the devils in his generation with [[CurbStompBattle ease]]. Only [[EmpoweredBadassNormal Issei]] can stand up to him among the new generation of devils.
* BadPresent: The BadFuture that ''[=BorN=]'' takes place is actually the present anime timeline due to Loki traveling back in time from the future. Issei's children is sent from the future to avert it.
* BaitAndSwitchLesbians: Most of, if not all the yuri scenes between the girls of the Occult Research Club are done just to get Issei into the mood before the compulsory MomentKiller.
* BarbieDollAnatomy: In the anime's opening the girls (most noticeably Asia) have nipples but the crotches of barbie dolls, but early in the manga even Issei lacks nipples, though in the manga the girls use GodivaHair too.
* BareHandedBladeBlock: [[spoiler: [[Literature/JourneyToTheWest The original Son Wukong]] uses only ''one finger'' against Cao Cao's [[GameBreaker True Longinus]]]].
* BashBrothers: Whenever Kiba isn't laying on the HoYay subtext on Issei, they have this sort of relationship.
* BatmanGambit: In Volume 19, [[spoiler: everyone figures that the Khaos Brigade would try to attack once the battle with the rogue exorcists started dying down, so they set up countermeasures to shut down their Evil Dragon {{Mooks}} and sealed off the area from VillainExitStageLeft.]]
* BattleHarem: All of the main female characters in the Occult Research Club are very competent members of the team in battle, and they all eventually become part of Issei's slowly-growing harem (though not initially).
* BeethovenWasAnAlienSpy: In chapter 8 of volume 1, it's at least heavily implied that Jesus' power came from a Sacred Gear.
* BedmateReveal: In volume 1, a naked Issei wakes up after getting injured by Dohnaseek and discovers an equally naked Rias sleeping next to him.
* BellyDancer: In the second OVA from Season 1, Issei becomes possessed by the mummy of an Egyptian Magician named Unas, who is just as perverted as Issei. Unas claims that he'll only release him if they remove the curse that binds him. The methods of removing it being perverted in nature; the first is Rias dance in a skimpy belly dancer outfit.
* BerserkButton:
** As a rule, the good guys take it very poorly when their families are threatened, and bad guys get pissed when their plans fail.
** If you're going to strip for Issei to nullify his [[TheNudifier Dress Break]] for the love of God ''[[UnstoppableRage do not take your panties off before your bra.]]''
* BigBad: Oh, boy. Let's count them, shall we?
** Volume 1: Raynare, the fallen angel who kills Issei [[spoiler:and Asia]].
** Volume 2: Riser Phenex, the pureblood devil son of a high-class family and Rias's arrogant fiance.
** Volume 3: Kokabiel, a rogue fallen angel who has stolen the pieces of Excalibur.
** Volume 4: Katerea Leviathan, a member of the Old Satan Faction who attacks the club at the peace conference.
** Volume 6: Diodora Astaroth, the strange heir of the Astaroth clan who's obsessed with Asia [[spoiler:and has been coordinating an EvilPlan to kidnap her since the very beginning]], with [[spoiler:Shalba Beelzebub]] acting as the GreaterScopeVillain.
** Volume 7 (and 5 in the anime): Loki, an evil Norse God.
** Volume 11 and 12: Hades.
** Volume 18-20: Rizevem Lucifer.
* BigDamnHeroes: Rias and her crew do this from time to time.
* BigFancyHouse: Rias's house in the Underworld [[spoiler: and later on, Issei's house becomes this.]]
* BigNo: Rias when her mother asks Kiba to clear out her room of the wooden bears she's been collecting.
* {{Bishonen}}: Issei, Kiba, Sairaorg, Vali, Cao Cao... Many of the boys in the series are quite nice-looking.
* {{Bishoujo}}: All of the main girls and most of the supporting ones are attractive women.
* BlackComedyRape: Downplayed in the English dub of the first rating game. After Issei uses [[TheNudifier Dress Break]] on three of Riser's pawns, Sona's response is "It's a little rapey".
* BoobsOfSteel: Averted, at least as far as the Occult Research Club goes. Rias and Akeno are primarily magic users, and the club's strongest physical fighters are Xenovia (around the median) and Koneko (the flattest).
* {{Bookends}}: The anime begins and concludes with the same scenes for each of the three seasons, with slight differences.
* BossRush: The entirety of volume 16 pits the group against: [[spoiler: Grendel, Crom Cruach, Rizevim, and Euclid]].
* BloodFromTheMouth: Issei in the first episode, when Yuuma [[ForegoneConclusion stabs him]] [[DeathByOriginStory to death]].
* BloodKnight: [[TheRival Vali.]] And [[DarkChick Kuroka]]. And [[TheDragon Bikou]]. And Cao Cao. And [[AxCrazy Freed]]. And [[OmnicidalManiac Shalba]]. And [[SexIsViolence Akeno]]. And... [[OverlyLongGag you get the point]].
* BreatherEpisode: Episode 7 of season 2 is a fairly lighthearted pool episode, following some rather brutal fighting from the previous one.
* BrickJoke: Sirzechs' suggestion to Issei to use Gift on Rias's breasts in Volume 4. Seven volumes later, [[spoiler:it shows Issei replenishing his aura at the cost of Rias's breasts shrinking.]]
* BrokenMasquerade: [[spoiler: Issei's parents find out about his true nature in Volume 20 after being forced to drink dragon blood by Belial and Rizevem.]]
* BunnyEarsLawyer: ''Anybody'' who is in the high ranks are this. Sirzechs, Serafall, Azazel, Odin.. take your pick.
* ButtMonkey: Compare everyone in the [[TheBeautifulElite Occult Research Club]] and [[MyFriendsAndZoidberg Issei]]. A good amount of the time Issei is going to take the brunt of some damage from events like sports, rumors, or from Azazel's crazy experiments.
* CanonDiscontinuity: Invoked by Ichiei Ishibumi when he wrote ''EX'', which effectively [[{{Retcon}} retcons]] some of the events of ''[=BorN=]'' (such as Loki using his curse on Rias and Issei) out of [[{{Canon}} canon]] into an AlternateContinuity.
* CantCatchUp: Beginning to show shades of this in the light novels in regards to the other members compared to Issei and Kiba, but especially Issei. They both start off as relatively weak members of the Occult Club with Issei being by far the weakest and Kiba being only around Koneko's level at best. Rias and Akeno at this point were far stronger. Then Kiba and Issei master Balance Breaker and everyone is left coughing in the dust. This is best exemplified when Issei was able to beat Sairaorg Bael using his [[spoiler:Balance Breaker]] whereas Kiba, Xenovia and Rossweisse (the three strongest in the Occult Club with Kiba being by far the stronger of the three) only managed to cut off an arm of Sairaorg [[spoiler:without Balance Breaker]] and the rest likely couldn't even scratch him. Right now, Issei is by far the strongest member of the Occult Research Club, with Kiba just behind.
** This has been thankfully subverted in the later volumes, as the girls begin to acquire their own methods of fighting at that level. Issei remains the strongest, but the others are no longer irrelevant.
* CantHaveSexEver:
** Deliberately {{enforced|Trope}} by Fujimi Shobo, otherwise we can pretty safely assume this series would've gone in a whole other direction by now. [[RuleThirtyFour Of course, many fans are eager to circumvent this.]]
** An in-universe example with Koneko. As a [[CatGirl Nekoshou]], Koneko can bear children even at her age. If she did, both she and the child would likely die. Issei tells her they should wait, and she agrees.
* CatGirl: They exist in the universe. Koneko is one.
* CerebusSyndrome: The series gets an overall darker tone for the fourth story arc, eventually culminating with [[spoiler:the self-sealing of Sirzechs and the Archangels to defeat [[EldritchAbomination Trihexa]].]] Ishibumi, however, stated that for the fifth and final arc of the story the series will go back to its humorous, fanservice-happy roots.
* ChainsawGood: Riser's two pawns, who are also twins, uses this against Issei.
* CharlesAtlasSuperpower: While there are plenty of magic spells and supernatural powers being thrown around, some characters manage to [[SuperWeight weigh in]] purely by physical skill. A shining example is Sairaorg, who is one of the strongest physical fighters in the series [[spoiler:even without his [[SuperMode Breakdown the Beast]]]] with nothing to his name but hard work and determination.
* ChessMotifs: The very nature of the Ratings Games, where players in a team are designated either as King, Queen, Bishop, Rook, Knight or Pawn. Within the Occult Research Team, Rias is the King, Akeno as the Queen, Kiba and Xenovia as Knights, Asia and Gasper as Bishops (with Ravel as a free agent from Riser's team), Koneko and Rossweisse as Rooks, and Issei using up all of Rias's eight Pawn pieces.
** TarotMotifs: Meanwhile, the angelic bureaucracy has this going on -- or to be exact, its playing-card equivalent, as evidenced by Irina being assigned as the Ace of Spades, with the Archangels Michael, Gabriel, Raphael and Uriel designated to the suits of Spades, Hearts, Clubs and Diamonds, respectively.
* ChekhovsGun:
** [[spoiler:Asia showing the holy water to the club room proves instrumental to Issei when he needed to defeat Riser.]]
** Back in Volume 4, Issei absorbed some of Vali's powers by infusing a part of the White Dragon Emperor's shard in him, thus being able to use Divine Dividing with only a MillionToOneChance of it working.
*** [[spoiler:In Volume 10, while Issei's almost about to lose consciousness, one of the past White Dragon Emperors appeared to him and told him to never give up and used its halving abilities to make the remnants of the past Red Dragon Emperors lose their grip on Issei. He then gets to use Illegal Trident Cardinal Crimson Queen.]]
*** [[spoiler:Now in Volume 16, Issei and Ddraig figure out a new more permanent use for the White Dragon Emperor's power, making lots of small white dragon statuettes that float around him, reflecting and dividing the power of enemy attacks (Possibly only working during the previously mentioned Cardinal Crimson Queen).]]
* ChekhovsGunman: Quite a few in this series that were mentioned at best make an appearance:
** At the end of Volume 1m Rias alludes to her having already used her first bishop piece. The boy she used it on, Gasper Vladi, returns to become a part of the club in Volume 4.
** Back in volume 1, Asia's past reveals that she healed a devil and that she was exiled from the church. Five volumes later, that same devil reappears in front of Asia [[spoiler:and turns out he ''planned'' the entire thing because he wanted to break down Asia.]]
** Volume 4 has Akeno alluding that she's a half-Fallen Angel half-devil and that she can never forgive her father. Three volumes later, he makes an appearance. [[spoiler:They finally get to resolve their issues too.]]
** Volume 10 has a boy who couldn't make it into the autograph event and that Issei was able to sign an autograph for him backstage and told him to not cry at all. [[spoiler:At the climax of his and Sairaorg's match, that same kid encouraged the other kids that Oppai Dragon will never give up, thus kids reaching out to him and not give in to [[DeadlyUpgrade Juggernaut Drive]].]]
* ChickMagnet: Not so much in the beginning Issei, but after being reborn...so many hot women are after him.
* ChivalrousPervert: Issei. Sure, he might be an unabashed pervert who is eternally enticed by boobs, but he treats women with due respect and ''dearly'' loves his harem, to the point that [[BerserkButton maiming it either physically or psychologically warrants death.]] [[spoiler:Just ask Shalba and Riser!]]
* TheChosenMany: For something to be so rare, there sure are a lot of Sacred Gear users in the setting. That's not counting according to [[WordOfGod Ichiei Ishibumi]], the thirteen Longinus users, one of which being Issei's Boosted Gear.
* ChurchMilitant: It seems the church in this setting has special squads of assassins and exorcists to deal with the supernatural.
* CliffHanger:
** Episode 4 of ''[=BorN=]'' ends on one, with Rias developing a huge BattleAura and declaring she'll never forgive Loki [[spoiler:after Issei is severely wounded by Fenrir, one of Loki's beasts.]]
** Episode 8 of ''[=BorN=]'' shows Asia fade away and presumably die just moments after being rescued from Diodora.
** Volume 19 also ends this way, with Riser and Ravel both being MIA after their Rating Game against Diehauser Belial.
* ClothingDamage: This happens a lot in the series.
** When Issei first gets his powers in the anime, the Fallen Angel that's attacking him gets what [[{{Stripperiffic}} little clothes]] she's wearing blown off.
** In Episodes 4 and 5, [[spoiler:as Asia's Sacred Gear is stolen, her top breaks apart. This remains consistent throughout her death scene in the following episode.]]
** Issei's "ultimate move" that Asia helps him practise at the training camp is Dress Break, a move that completely destroys his enemies' clothing, which outright ''got banned'' in Rating Games after the first game was over.
** In Episode 10, [[spoiler:when Koneko gets hit by one of Riser's traps, her already torn-apart outfit is completely destroyed.]]
* ClingyJealousGirl:
** Asia shows signs of it in volume 3, Rias as well. Then...[[spoiler:Xenovia, Akeno, Irina, and Koneko just slightly.]]
** The "clingy" part gets turned UpToEleven in [[spoiler: volume 14]], and it is ''adorable''.
** To give some context to the above, the girls are acting extremely clingy towards Ise because [[spoiler:he freaking ''died'']] and they are understandably reluctant to let him out of their sight. Ise mentions this to Kiba, who (politely) tells him to shut up and let them do what they want.
* CombatSadomasochist: Akeno. Good lord, Akeno!
%%* CompetitiveBalance: The Rating Games have this format. Take note however that depending on the individual this could change. For example giving someone fast a Rook would make them a LightningBruiser instead.
* ContinuityReboot: One particularly evil Norse god inflicts a curse on Asia, kills the Chichigami and wreaks havoc on the anime's timeline with his Underworld Lifeforms leading to the events of ''[=BorN=]''. Fortunately, Issei's kids to back in time and help [[ResetButton reset the anime's timeline to match that of the light novels]].
* CorruptChurch:
** Averted. While there are certain church members who are clearly on the evil and immoral side, most notably the freelance devil bounty hunter, Freed Sellzen, they are shown as being few and far between, and are swiftly excommunicated from the church once their wicked actions come to light.
** Even the members who rebel later are only doing so because [[spoiler:they can't deal with suddenly having to throw hundreds of years of hatred and all their personal pain away like it was meaningless.]] The Leaders of the Alliance recognize this and instead of crushing them, purposefully have them fight people too strong for them to kill but not strong enough to defeat them, so they can let all of their suppressed hatred out and move on. They peacefully surrender afterward.
* ContinuityNod: In a meta sense, the conversation between Rias and Sona in Episode 4 of ''[=BorN=]'', regarding a hypothetical Rating Game between them. In the light novels, Vol. 5 is where said Rating game takes place - the anime, however, incorporates elements of Vol. 7 in addition to the previous two, and this doesn't happen due to Loki's interference with the timeline.
* CoolBigSis: Rias and Akeno are described as this towards the entire school.
* CoolVersusAwesome: Fights between mythological groups radiate this trope.
* CrouchingMoronHiddenBadass: Issei, of course. Most of the time, he just acts like a horny teen with nothing on his mind but {{b|uxomIsBetter}}oobs - his main 'ambition' is to have his own Harem, and he tends to dramatically proclaim his next 'target'... such as "sucking on Rias-sempai's breasts!" Even after he becomes a Devil, he's still just a '[[ChessMotifs pawn]]', he's terrible at making Pacts with mortals, and can't even use the Magic Circles to travel unaided. However... when he's forced to fight, particularly in defense of [[ChivalrousPervert the girls he cares about]], he can and will kick epic amounts of ass. And yet he continues to have little self-confidence, failing to realize how impressive he looks from the outside. In an unusual twist on this trope, however, he's actually at his most badass when the two sides of his personality are in balance, since he can literally draw destructive power ''from his lust''.
* CrucifiedHeroShot: Asia in episode 4
* CurbStompBattle:
** Issei's first fight against Riser. [[spoiler: Although he tries to be the {{Determinator}}, Riser continually beats him to the point that Rias surrenders the rating game to save his life. Issei then returns the favor in their next fight.]]
** Issei and Kiba vs Xenovia and Irina. [[spoiler:The latter two win rather easily, largely due to faults the former two had, such as Kiba attempting to use a big, heavy sword which negated his speed advantage, and in Issei's case, Koneko warning Irina about his [[TheNudifier Dress Break]] ability ahead of time.]]
* CuteBruiser: Koneko is adorable enough to be considered a school mascot, and strong enough to punch you through walls.
* DamnedByFaintPraise: In episode 7, Koneko tells Issei that embroidering some headbands is "A feat outside of my expectations".
* DancingTheme:
** The anime ending theme. Ye gods, the ending theme!
** Also CreditsRunningSequence: Issei in the first part of the anime ending theme. [[spoiler: OK, it's the part no one remembers.]]
* DarkAndTroubledPast:
** Who knew... Everyone in Rias's group except Issei has this. Rias is the head of her household since her brother became the ''de facto'' ruler of hell, Kiba was a survivor of an illegal church experiment in which only he survived because of Rias, Koneko was saved from death after her sister killed her master, Akeno is a half-Fallen Angel due to her father being one and her mother a human. Her mother was killed by her father's enemies. Asia has the ability to heal anything, at first the church thought it was a blessing until they found her she could also heal devils, after which they branded her a witch.
** Issei proclaims that he has one in Volume 8. [[HilarityEnsues It's actually pretty funny.]]
** [[spoiler:Even Issei's parents aren't immune. Issei's mother suffered two miscarriages before Issei was born. It puts a new perspective on all their hopes and dreams on Issei and their [[DotingParent doting nature]] towards Asia.]]
* DarkestHour: [[spoiler: Volume 11. To wit, Hades starts a war in Hell, 75% of Ophis' power was taken from her thus unable to return to her dimension, Vali is poisoned thanks to Samael the Dragon Eater, [[OurHeroIsDead Issei dies]], and everyone else is having a HeroicBSOD.]]
* ADayInTheLimelight: More like a ''volume'' in the limelight but everyone in the Occult Research Club has their stories centered on a certain volume. Issei and Asia for Volume 1, Rias for Volume 2, Kiba for Volume 3, Gasper for Volume 4, Koneko for Volume 5, Asia again for Volume 6, Akeno for Volume 7, Volume 9 for Kunou, volume 10 for Rias again. Ravel stars in Volume 14. Reversely, volume [[WhamEpisode 11-12]] take a break from focusing on the girls to [[HolyShitQuotient show off]] Issei. [[AvertedTrope Averted]] with volumes 8 and 13 as these are [[ShortStory short story]] compilations.
* DarkIsNotEvil: [[OurDemonsAreDifferent Devils]] are mostly just people trying to evict the FallenAngel invaders of their home, and the fallen often have sympathetic natures and personalities.
* DealWithTheDevil: The ORC's job between crisis situation is to fulfill literal ones, but in a subversion most of them appear to be generic odd jobs that don't need any kind of demonic ability to complete. For example, one of Koneko's regular contractors is a costume designer who uses her to model loli cosplay outfits.
* DeathByOriginStory: Issei Hyoudou, Asia Argento, and Akeno's mother Shuri Himejima. [[spoiler:Cleria Belial also]].
* DeathIsCheap: Otherwise the series probably would've ended right away.
* DeclarationOfProtection:
** Subverted with Asia in episode 3. Issei does try to protect her, but he's nowhere near strong enough to fight Freed, and only manages to land one lucky punch. Issei even suspected he was outmatched, and were it not for the timely arrival of Rias, he probably would've died there.
** Played gloriously straight in Volume 6, where both Issei and Xenovia swear that if [[spoiler:Diodora]] ever comes near Asia again, they will kill him.
* DefeatByModesty: Issei's [[TheNudifier Dress Break]] invokes this, sure its mainly used on females but usually it's not modesty that defeats them, it's the heavy-handed blasting coming from Issei or one of his teammates as person in question covers their naughty bits.
* DeusExMachina: Twice in the series, with [[spoiler:the Chichigami/Breast God helping Issei defeat Loki at the end of Volume 7, and then Issei's resurrection by the hands of Great Red and Ophis in Volume 12.]] The latter is linked to the DiabolusExMachina described right below.
* DiabolusExMachina: Issei gets struck by it ''real hard'' in Volume 11: [[spoiler:he successfully defeated Sairaorg and became the new strongest Young Devil, he got promoted to Middle-Class status, and his harem helped him overcome his emotional baggage. And then he dies from Samael's curse.]]
* DidWeJustHaveTeaWithCthulhu:
** Odin pays a visit to Issei's house and was hanging out with Azazel. [[spoiler:Ophis also visits Issei's house in volume 11.]]
** [[spoiler: After the end of volume 12, she becomes their mascot.]]
* DidYouJustPunchOutCthulhu: Issei's fight against Riser. [[spoiler:He sacrifices his left arm in order to obtain some powers from his Sacred Gear. But more importantly, since it's no longer technically his arm, he is able to hold the cross and utilize holy water against the otherwise undefeatable Riser without the usual repercussion of a devil holding holy items and taking damage.]]
* DiedInYourArmsTonight: Before Rias revives Issei.
* DirtyCoward: After ''repeatedly'' grinding the fact that she played with Issei's heart and how his cherished first date with her was a "boring waste of time" into his face, Yuuma STILL reverts to her adorably innocent human form to beg for her life as Issei is about to strike the killing blow. She even sinks so low as to show him the armband he bought her, proclaiming how precious it is to her. Fortunately for Yuuma, Issei, ''even now'', still fondly holds onto those warm memories as cherished moments of love and happiness, and could not bring himself to kill her. Unfortunately for Yuuma, he leaves her to Rias's discretion - whom was already going to kill Raynare, is visibly furious for the Fallen Angel [[BerserkButton toying with Issei's heart]] [[ItsPersonal right in front of her.]]
* DirtyMindReading: [[spoiler:Issei's Bilingual fails on Sairaorg's bishop because ''she's willing to strip for Issei and her breasts just say which clothing she's taking off.'']]
* DistractedByTheSexy: In episode 2, Rias attempts a demonstration of Issei's powers, and tells him to raise his left hand and concentrate. Unfortunately, she's sitting right in front of him, and higher up, so he's able to see up her skirt, and can't concentrate properly. He even [[LampshadeHanging points it out]] in his thoughts.
* DoesThisRemindYouOfAnything: Issei's Boosted Gear has the ability to double the power of the user every ten seconds at the cost of putting strain on the user. Oh the effects can also be stacked. It may remind some people of the [[Anime/DragonBallZ Kaio-ken]] which boosts the users power, speed, defense, ki, etc. The only change produced by the basic Kaio-ken to be quantified in the series is that it doubles the user's power level. The Kaio-ken is also quite taxing on the user's body.
* DownerEnding: This is how the past Boosted Gear users lives ended according to a lot of people, foremost being Ddraig. [[spoiler:Issei has a close brush with this trope in volume 11 but revives with some help from Ddraig, Great Red, and Ophis.]]
* DragonsAreDivine: Dragons are shown to be very powerful beings that could rival those of Heaven, Hell, and other Gods in mythology. In fact, [[spoiler:the battle between Ddraig and Albion cause the death of God and Devil when the army of Heaven, Hell and Fallen Angels battled them]]. And in the future, [[spoiler:Issei himself becomes a powerful dragon that could wipe out a platoon of low level Gods. He's also a major celebrity in the Underworld]].
* DubInducedPlotHole: Hoo boy, ''[=BorN=]'' has a doozy. In seasons one and two, the translators apparently mistook Issei calling Rias "buchou" (fan-translated as "Prez" in most places, including this very page) as a purely cultural thing and had him use her name normally... except it's ''not'', [[spoiler:it's a symptom of TokenMotivationalNemesis Raynare having scarred Issei way deeper than anyone thought]], and Rias definitely noticed the pattern. Come Season 3, a plot-critical character arc's handling make it's end result uncertain due to the AlternateContinuity. [[note]] When she goes to ask what she means to Issei, he could still answer along the lines of 'You're my prez', without the need for her name being involved. Time will tell [[/note]]
* DudeWheresMyRespect: {{Averted}} with Issei. At the start he was treated as a joke by even low-tier Fallen Angels but once he started getting stronger opponents took him more and more seriously.
[[/folder]]

[[folder: Tropes E to N]]
* EarlyBirdCameo:
** Sona Sitri makes a brief speaking appearance in the first episode of the anime. In the light novels she was not introduced until volume 3.
%%* {{Ecchi}}
* EmpoweredBadassNormal: Issei. He has a Sacred Gear but it's noted that he achieved his level of power not because of his sacred gear but because of TrainingFromHell and his [[{{Determinator}} will to never give up]]. Otherwise he would be far weaker.
* EndOfAnAge: The aftermath of [[spoiler: Trihexa's rampage]] results in this. [[spoiler: In order to reseal Trihexa and ensure that it will be defeated for good, most of the leaders of the various factions [[SealedEvilInADuel sealed themselves with Trihexa]]. Also, the entire rampage in the human world was [[BrokenMasquerade recorded by the media]], and what's left of the various factions can only do so much to cover up what really happened. And to top things off, Rizevim and the Evil Dragons managed to make contact with another dimension and sent over information on teleportation techniques, and with nobody to keep Indra in check, interdimensional war is a huge possibility in 30 years.]]
* EnemyMine:
** Xenovia has no issues siding with the devils in Rias's group in order to take out the Fallen Angels who have stolen some holy swords. The latter are helping partly because they're fighting a common enemy, but also [[spoiler:because of Kiba's obsession with destroying holy swords, due to his tragic past where he was forced to take part in experiments to be able to wield them, only to then watch the other kids get killed when they were no longer useful in the experiment. As a result, the others decide they want to help him, since the end result was still getting rid of the holy swords. Fortunately, Xenovia makes a HeelFaceTurn after learning that GodIsDead.]]
** PlayedForLaughs during Issei's first fight with Irina. He attempts to use his [[TheNudifier Dress Break]] move on her, but Koneko warns the girl what said ability is used for. Consequently, Irina dodges his attempts to touch her. When he complains about Koneko helping their enemy, she simply states that he is an enemy to all women.
** Issei's boost gear, Ddraig, tells him about the three-way war between heaven, hell, and the fallen angels during episode 8 in season 2. He mentions that for the most part, the dragons stayed out of the conflict, but two of them, himself and Albion, joined the fray. They raised such a ruckus that all three sides stopped fighting temporarily to stop the two dragons. In the end, the two dragons were chopped up, and their souls sealed in the boost gear that their respective humans have. And because of the nature of their being, they're always destined to fight each other should they meet.
* EveryoneCanSeeIt: It is so painfully obvious Rias likes Issei that her father acknowledges him as his future son-in-law... Same thing applies for Akeno later on, and any savvy reader notices Asia's liking of Issei from the first chapters after she's introduced.
* EvilCounterpart: Vali Lucifer and Albion are evil counterparts to Issei and Ddraig.
* ExitPursuedByABear: At the end of Volume 20, [[spoiler:Rizevim gets eaten alive by Fafnir]].
%%* EyesAlwaysShut: Akeno, at times.
* FaithHeelTurn: [[spoiler:After Xenovia learns that God died during the previous war between the three races, she is driven to desperation and finds hope in having Rias turn her into a devil. She also attempts to redirect her former faith towards worldly desires (namely, getting into Issei's pants), but, like Asia, she still finds herself constantly praying and turning to God for help, which always results in sharp migraines, at least until Issei asks that Archangel Michael give them special permission.]]
* {{Fanservice}}:
** Gratuitously and utterly without shame. Yep, the anime adaptation's earned its TV-MA rating alright.
** Just look at the third ending for the [[https://www.youtube.com/watch?v=R5ILCmafpHQ anime.]]
* FantasticArousal: The girls let off a very suggestive moan whenever Issei transfers his power over to them.
* FantasyKitchenSink: Humans, devils, fallen angels, angels, vampires, Norse mythology, Greek mythology, Hindu mythology, dragons, [[spoiler:a breast god]], anything you can think of, it's in here.
* FemmeFatale: Yuuma Amano.
* FieryRedHead: Rias in a nutshell, although her power is actually destruction.
* ForeignFanservice: Slightly over a minute into the series the presence of overseas students is stated to be one of the great things about the school. When Rias is introduced, it's mentioned that she is rumoured to be Scandinavian and after the BedmateReveal in episode 2, Issei's mother specifically states her son's in bed with a foreign girl.
* ForegoneConclusion: Anyone who's read the ''EX'' spin-off light novels knows that [[spoiler:Issei will have children with his haremettes]].
* {{Foreshadowing}}: In the anime, at least. Blink and you'll miss it, but after getting Boosted Gear to work the first time, Issei deflects a bolt of Holy Lightning with it. [[spoiler: Guess what plays a crucial role in beating Riser?]]
* FirstEpisodeResurrection: In volume 1, Issei and Asia are killed but are revived as devils.
* FirstKiss:
** [[spoiler:Rias steals Issei's first kiss and later on, Asia and Akeno's first kisses are also from Issei. Although it is later revealed that Issei's first kiss was with Irina when they were still children.]]
* ForegoneConclusion: Anyone who has read ''EX'' knows that [[spoiler:Issei will have children with his haremettes]].
* FountainOfYouth: One short story has Rias and Asia turned into children, with their memories sealed and their behavior and intelligence scaled down appropriately. The Club manages to reverse the effects by the end, only for Issei (who the two had been trying to de-age in the first place when Rias's spell backfired) to suffer this when Gasper unintentionally pushes him into the magic circle. His mind isn't altered, but the Club decides that restoring him isn't a priority.
* FriendOrIdolDecision: During a break from their sparring, Azazel asks Kiba between Issei and Rias, who would he save. Kiba then flat out tells him that he'll save Rias because without her, everything is lost.
* [[FriendsRentControl Friends Property Tax Control]]: Rias has Issei's house rebuilt into a six-storey, three-basement estate. Even if the neighbors were hypnotized into not noticing the overnight renovations, the ramifications of violating roughly all the zoning laws and the colossal jump in property value and rates are never mentioned.
* FromBadToWorse: In volume 2, Riser turns up and Rias proposes to hold a Rating Game. Then the Occult Research Club gets defeated by Riser's allies. Then Riser brutally attacks Issei. ''Then'' Rias is forced to stop the game by resigning before Issei gets injured any further. And this happens a few chapters before the EngagementChallenge between Issei and Riser.
* FunbagAirbag: In Season 3, while the group travel to the Underworld on a train, Akeno falls on top of Issei due to the emergency stop.
* {{Gainaxing}}: Generally all the girls, with boob bounce sounds. Two exceptions are Asia and Konkeo, who aren't quite big enough for that, though once or twice they'll ''still'' have this effect if you look closely.
* GenreSavvy: Nearly everyone is at least at some level of this. It's to the point where Azazel and the Maous outline the motivations of the Hero Faction in video game terms.
* GodAndSatanAreBothJerks: Inverted. Most Devils are represented in a positive light, as are the Angels and most Fallen Angels.
** Which is closer to the original depictions of devils in some sources (where they are primarily a [[TheTrickster trickster figure]] who tempts humans to do their bidding rather than outright omnicidal, maliciously evil. The devil jobs that Issei and co. do reflect this.
* GodIsDead: [[spoiler:Michael's the one running the place in Heaven and not God, that's why Asia can heal devils, and Kiba can {{dual wield|ing}} a holy sword and a demon sword. The reason he died is because he pulled off a DyingMomentOfAwesome by sealing a being ''on par with Great Red and Ophis.'']]
* GodKartingWithBeelzebub: While the devils, angels, and fallen angels are all technically enemies, most of them have no qualms interacting on friendly terms. The Archangel Michael is shown to be exceptionally respectful to members of the other classes, even giving Issei the special Holy Sword, Ascalon, to help him beat the White Dragon Emperor.
** This gets further played after [[spoiler:the three races unite under a peace treaty. They might as well not even be of different classes post that happening.]]
* GondorCallsForAid: [[spoiler:When Hell gets invaded by Hades and the Khaos Brigade, the leaders try to convince the other members of TheAlliance to help them. While they would, seeing as there's [[AchillesHeel someone who wields the most powerful Longinus that could kill them]], it made things harder for them to move. They then send their armies instead to deal with the threat.]]
* GoodOldFisticuffs: What pretty much happened with Issei and Sairaorg.
* GreenEyedMonster: Issei when he's first seen by his [[ThoseTwoGuys two guy friends]] with Yuuma, and later with Rias. The girls also have this look when Yuto arrives to pick him up for Rias.
* GuiltyPleasure: In-universe example, Issei has gone...somewhat far with some of the girls, to the point it's just short of sex.
* HandshakeSubstitute: Issei and Kiba do the fist bump variation just before they go to their separate positions in their first Rating Game.
* HardWorkHardlyWorks: Subverted. Issei is mentioned constantly to be talentless and no good at anything at all. He goes through TrainingFromHell constantly to improve himself and in the end it worked. He turned out to be the strongest out of the Occult Club which consisted of some of the most talented individuals and some of them even had special lineages such as the the sister of the current Satan and the daughter of a leader of the Fallen Angel faction. He even eventually matched up to [[TheRival Vali]] who had the lineage of the original Satan to back himself up. The author himself mentioned that this is a series where hard work pays off and it shows. Azazel even thinks of Issei as a sponge who can absorb anything. Same thing with Sairaorg who also subverts this trope because any devil who fights off against him and loses, they don't have what it takes to bounce back since their powers don't work on someone who's just using his body as a weapon.
* HaremGenre: The girls of the Occult Research Club eventually all become part of Issei's harem, but they aren't initially.
** Volume 1 starts with just Rias and Asia being the two opposing love interests.
** Volume 3 has Akeno start to develop feelings for Issei.
** Volume 4 has Xenovia develop a crush on Issei.
** Volume 5 has [[spoiler:Koneko develop feelings for Issei after he saves her from Kuroka]].
* HaremSeeker: Somewhat averted, while still being played straight - Issei's dream has always been to have his own harem, and he aims to be the "Harem King" upon getting his own peerage. However, he never intends to make the girls of the Occult Research Club his harem, though it inevitably happens.
* HarmfulHealing: [[spoiler: Issei's most recent power up, Diabolos Dragon causes him to become almost allergic to breasts; something that normally heals him. It's so bad, that he's incapable of saying the word, seeing them in life, and just holding an erotic magazine causes him seizures.]]
* HarmlessElectrocution: Issei. Whenever he gets zapped by Rassei, Asia's pet, he gets the comically electrocuted treatment, he's left with no lasting damage and is usually fine in the next scene.
* HearingVoices: Special Sacred Gears usually have something sealed within them [[spoiler: Issei's has a red Welsh Dragon named Ddraig.]]
* HealingFactor: This is the reason monsters such as [[spoiler: Jaberwocky]] and [[spoiler: Trihexia]] are so dangerous and difficult to deal with. They regenerate so quickly that, unless they're destroyed completely in a single blow, they just get up and attack again like nothing happened. [[spoiler: Trihexia takes it even further. When Issei and Sirzechs are fighting an exposed core, even the power of destruction that had Hades going BringMeMyBrownPants, fails to destroy it, as it grew back FromASingleCell in mere seconds, and Issei's new ability, an inextinguishable flame that burns until the living being struck with it has been completely obliterated is nothing more than a nuisance, as the core regenerates faster than the flame can burn it.]]
* AHellOfATime: With most Devils being a bunch of good folk, it really isn't a big surprise.
* HeroicBSOD:
** Issei after [[spoiler: Asia's supposed death at the hands of Shalba Beelzebub.]]
** ''Everybody'' in the Occult Research Club after learning that GodIsDead and later, [[spoiler:Issei's death.]]
* HeroesActVillainsHinder: After creating TheAlliance between the angels, fallen angels, and demons, Khaos Brigade started on terrorizing them because the three factions hate peace and/or are threatened by said peace by the three factions.
* HighAltitudeBattle: The first fight of Volume 7 has everybody facing Loki in the air.
* HornyDevils: The main reason Issei is cool with becoming a demon is that Rias tells him he can use it to get laid.
* HowWeGotHere: Episode 1 begins with Issei dying from Raynare's attack on him and the events leading to this moment.
* HumanMomNonHumanDad: All {{Half Human Hybrid}}s (Akeno, Gasper, and Vali) fall under this.
* HumongousMecha: [[spoiler:Azazel makes one from Sirzechs' request. He builds it ''underneath the swimming pool of the school'' named Maouga.]]
* ICanExplain: Issei has to explain to his parents first why there is a naked red-headed girl sleeping in his bed, and later why another girl is coming to live in their home. As of the Season 1 finale, [[spoiler:make that ''two'' girls]].
* IceQueen: Koneko, especially to poor Issei. She becomes a DefrostingIceQueen later on.
* IdiosyncraticEpisodeNaming: Or in this work's case, "Idiosyncratic Volume Naming".
** All the volume titles (save for the short story collections) are named after an event that may happen while in high school.
** As for the chapters themselves, they are called "Lives".
* IHaveBoobsYouMustObey: This is practically how Issei works.
* ImpaledWithExtremePrejudice:
** Twice in the first episode. In the books, Issei's been impaled more than Jenna Jameson.
** Azazel also offs Katerea this way by throwing his spear right at her.
** Issei finally gets to dish out several simultaneously [[spoiler:in the first Rating Game using "Gift" with Yuto's ability to summon a FieldOfBlades under a group of Riser's pieces]].
* InkSuitActor: A coincidental example. Rias resembles her English dub's voice actress Creator/JamieMarchi, Akeno Himejima resembles Teri Rogers (her first English VA), and Asia resembles her English VA Chloe Daniels.
* InMediasRes: TheTeaser of the first episode begins with Issei's death and resurrection by Rias.
* InnocentFanserviceGirl: Asia, definitely.
* InstantArmor: Issei's Sacred Gear starts out as an Instant Gauntlet, but as it grows more powerful, it gradually expands to cover most of his arm. [[spoiler: Then, after he sacrifices his arm to Ddraig for a short-term power boost, his left arm BECOMES the gauntlet, and he has to use magic to keep it NORMAL.]] Later on, he becomes able to summon a fully-covering suit of magical armor to go with it. [[spoiler: And of course, Vali - the White Dragon Emperor - can use HIS version of this power pretty much from the start, and does so with abandon.]]
* InstantAwesomeJustAddDragons: There are the three main factions: Devils, Angels, Fallen Angels, and then there are the dragons who decided not to align with any of the three and are strong enough to enforce that fact.
* InterserviceRivalry: After becoming TheAlliance, the Judeo-Christian faction play a version of this. The Devils being analogous to the Army, the Angels as the Navy, and the Fallen Angels as the Air Force. Then there's the Human side, the Sacred Gear possessors and the hybrids, as the Marines.
* IWasJustPassingThrough: Vali invokes this from time to time. Sometimes however, he really does have an agenda.
* JawDrop:
** Tannin pulls off a funny one when [[spoiler:Issei accidentally summons a Breast Fairy and asks the former as to which mythology is it a part of.]]
** Both Issei and Rias do this in response to the Four Satan Rangers.
* {{Jerkass}}: Rias's fiance Riser and Matsuda and Motohama, Issei's two friends who start spreading rumors about him because Issei is so close to many beautiful women.
* JumpedAtTheCall: More like sprinted towards the call but Issei definitely fits.
* {{Kiai}}: Koneko uses them, {{subverted|Trope}} since she's not HotBlooded at all, rather than screaming it's a quiet "eh!" then whatever she just punched [[PunchedAcrossTheRoom goes flying]]
* KnightTemplar: Quite a few with the most notable being the Old Satan Faction and the Hero Faction, both absolutely convinced they're in the right and willing to do anything to get what they want.
* LapPillow: He gets it from 3 people, Rias in Volume 2 to unseal his powers and early on in Volume 3 from Asia. Akeno joins in on volume 4.
* LaserGuidedAmnesia: Rias tells Issei in episode 2 that fallen angels and demons can selectively erase themselves from human memories, such as Yuuma with Issei's two guy friends, and later Rias with Issei's parents after his mom catches them in his room naked.
* LateArrivalSpoiler:
** [[spoiler:Asia being killed, and thereafter resurrected as a devil]] is a major spoiler for the first arc of the series, and only occurs at the end of Volume 1 (or Episode 5 in the anime). It is almost impossible to talk about the series without spoiling this fact somewhat, although it is possible to downplay it so the scene still comes as a surprise.
** The fact that GodIsDead is a major twist in the second season/third volume, but provides much of the lore of the series, and is often spoiled.
* LightIsNotGood: Fallen angels can still use the power of light, and they're in hell fighting with the devils.
* LikeBrotherAndSister: Issei and Asia, to the point that the former, while relishing any opportunity to ogle her (developing) breasts, generally keeps his hands to himself for a change.
* LittleNo: Ravel upon realizing just why [[spoiler:[[OurHeroIsDead Issei's Evil Pieces were summoned back from the dimensional gap instead of Issei himself.]]]]
* LoadsAndLoadsOfCharacters: At the start, there was only the Occult Research Club, then they added fallen angels, devils, God and his angels, dragons, exorcists, fallen exorcists, Valhalla, pretty ''any mythology'' you can think of, it's here.
* LoopholeAbuse: In the rating game against Riser, Rias's team does fairly well against his despite having fewer pieces/characters. [[spoiler:Then when Issei reaches Riser, he refuses to stay down despite receiving a CurbStompBattle from the latter and barely having the energy to stand. Riser then mentions that he wants to kill Issei, and that if he should happen to die during a rating game, it would be seen as an accident, rather than murder. Rias is also aware of this, and surrenders herself in order to save Issei.]]
* LovableSexManiac: Issei and his non-demonic pals, Matsuda and Motohama.
* LoveMakesYouEvil: Or in this case, "Love Makes You Turn Into a Fallen Angel." Azazel explains that the first fallen angels became so was because they made out with a human being. [[spoiler:Irina almost gets turned into a fallen angel twice. Then volume 19 reveals that they were many other offscreen moments where Irina was in danger of falling.]]
* LoverTugOfWar: Poor Issei sometimes.
* LuckyCharmsTitle: If you want to be totally accurate, it should be "D×D".
* MagikarpPower: Pawns can promote into any piece except a King as long as they are in the enemy territory.
* MarshmallowHell: It's through hell that Issei finds his heaven. While never exactly innocent, the reasons for it run the gamut from fluffy (it's just how Rias hugs him; she's tall, affectionate, and has romantic feelings that lead her to indulge him a bit) to sultry ([[TheTease Akeno]] has designs to be TheMistress and gets a kick out of anything scandalous).
** UpToEleven in the Season 2 OVA where a pervy monster strip the girls and, manipulating their bras, make them surround Issei to stop his attack. He end in a sandwich with all his harem; so much that the monster, now jealous, decides to absorb the girls instead.
* MeleeATrois: There are three different powers currently in this setting: {{God}} and his angels, the fallen angels, and the devils.
* MellowFellow: The Archangel Michael. Even when he's waging in battle, he's still pretty calm.
* {{Meido}}: Grayfia, head maid to Rias's Brother's household. [[spoiler:Also she's his wife.]]
* MohsScaleOfViolenceHardness: It ranks a violent 7. For example, plenty of people get bloody wounds (such as Issei getting stabbed by Raynare in Volume 1), Riser's face gets burned to a crisp in Volume 2, some characters such as Raynare, Katerea, Shalba and Creuserey are disintegrated into dust, and [[spoiler:Rizevim gets EatenAlive by Fafnir]].
* MomentKiller: ''Tons'' in this series. If it's not Issei who says something idiotic or [[ObliviousToLove doesn't know what his partner is talking about]], it'll either be someone else either spying on them (Irina, Xenovia) or calling them from a distance (Azazel, Odin).
* MoodWhiplash:
** Pretty much how this series works. After discussing serious issues in volume 7, Azazel asks where Odin wants to go. He ''immediately declares'' that he wants to go to a breast club much to the consternation of the group.
** Volume 12 starts out depressing after what happened in the previous volume. [[spoiler:And then, it's now at Issei's perspective of the story where the first few things that he says is that he can't even make out with Rias anymore with his current spirit form.]]
* MsFanservice: Rias and Akeno, they have BoobsOfSteel, considered the 2 idols of school, and are incredibly beautiful and are {{Shameless Fanservice Girl}}s.
** Rias is willing to be naked in front of her servants, especially towards Issei. While Issei was freaking out and his mother seemed stunned, her response when she walked in on them naked in bed was a polite "good morning" without even trying to cover herself up.
** About Akeno, Female Fallen Angels are renowned for having very seductive bodies and her naturally sexy disposition, plus having the largest breast size in the series so far, only enhances this fact. Azazel himself states that Akeno is seductive even for a Fallen Angel.
** The other major girls in the Issei harem (as Asia and Xenovia) are hovering between to being a sort of InnocentFanserviceGirl who doesn't realize there's a problem with getting naked in a particular situation and a ShamelessFanserviceGirl who fully comprehends what she's doing but does it anyway to achieve her goals.
* MundaneMadeAwesome:
** Issei's alarm clock.
** Issei's [[TheNudifier Dress Break]] debut in episode 10. ''Complete with OminousLatinChanting''.
* NakedApron: Issei sees Asia wearing one during season 2. When he protests that his parents would be mad if they saw her like that, his mom pops out from the kitchen, stating she was the one that came up with the idea. Rias then decides to do the same as well.
** The first special of Season 3 has Rias and Akeno compete for Issei's affections. Rias begins by acting and dressing like a sexy school teacher while Akeno plays the role of housewife wearing nothing but an apron.
* NearVillainVictory: In ''EX'', Loki and the Underworld Lifeforms wreaks utter havoc with the timeline. They succeed in creating the AlternateContinuity that ''[=BorN=]'' takes place in, killing the Chichigami and inflicting a curse on Rias and Asia. Loki would have won if it wasn't for Issei's children time traveling to the past and [[ResetButton rebooting the anime continuity]].
* NewSeasonNewTitle: While Season 1 is titled "Highschool [=DxD=]", subsequent seasons have additions to the titles: "Highschool [=DxD=] NEW" (Season 2) and "Highschool [=DxD BorN=]" (Season 3).
%%* NippleAndDimed
* NoPronunciationGuide: It took until Season 3 for the [="DxD"=] portion of the title to be confirmed to be pronounced "Dee-Dee".
* NothingIsTheSameAnymore: In Volume 21, [[spoiler: most of the faction leaders and their subordinates seal themselves with Trihexa [[SealedEvilInADuel to fight against it]]]].
* NotSoDifferent:
** The three classes of supernatural beings. This is especially made prominent when the angel, fallen angel, and devil leaders sit down to have a peace meeting. Archangel Michael makes it clear that he does not see the other races as inherently evil, nor does he believe all of his own race to be inherently pure, admitting that excommunicating Asia and Xenovia from the church for their fairly innocent actions was brash and wrong, even asking that they forgive him.
** Also, this is the exact reason why Issei and Vali have stopped fighting because of the Ddraig-Albion feud and became allies. They both have high moral senses, and greatly care for their respective teammates. Though, according to Vali, that isn't going to stop the two of them from inevitably clashing against one another.
[[/folder]]

[[folder: Tropes O to Z]]
* OffModel: Some of the pin-ups lapse into AlienGeometries and BodyHorror.
* ObliviousToLove: Issei wants a harem, but doesn't notice the one he has. [[spoiler:Well, if it wasn't for Raynare who fucked him up in romance...]]
* OlderThanTheyLook: Subverted with Rias. She sometimes refers to Issei as a child in the novel and she is actually old as she looks.
* OldSchoolBuilding: Where the Occult Research Club is located.
* OneManArmy: [[AuthorityEqualsAsskicking Any of the leaders of the factions]], [[EmpoweredBadassNormal Issei]] plus his rivals, and the [[PhysicalGod Gods]].
* OurAngelsAreDifferent[=/=]OurDemonsAreDifferent: Demons and fallen angels are two separate classes of beings: demons are the original inhabitants of hell, whereas fallen angels are interlopers who settled there after getting kicked out of heaven. The two groups have been at war ever since.
* OurDragonsAreDifferent: Unusual for media, but Issei's dragon is a [[UsefulNotes/{{Wales}} Welsh Dragon]]. Not something you see every day.
* PalsWithJesus: Well, maybe not Jesus specifically, but Issei along with the other main devils are on pretty good terms with most of the holy faction, with Michael even creating a PocketDimension that Issei and another angel, Irina, can get their freak on in without Irina losing her angel status. Sadly, due to ExecutiveMeddling, Issei is going to have to wait a while to finally make good on that opportunity.
* PantyShot: The ratio of panty shots to pages in the manga is virtually 1:1; the anime doesn't try to do much less.
* PapaWolf: Don't threaten his friends or a child, or Issei will end you. Just ask Raynare, Riser, Loki or Shalba.
* PeaceConference: Happens in the fourth volume. It was successful, however there is a certain faction who doesn't want in.
* PeepingTom: The first scene in the novels involves Issei and his friends Matsuda and Motohama peeking at the girls locker room.
* PhysicalGod: [[spoiler:[[ExactlyWhatItSaysOnTheTin Gods]] in this series are extremely strong. Loki, for example, could hold off the two strongest members of the Fallen Angel group plus the entire Occult Club plus Saji in his dragon from with ease. Also Son Wukong has been shown to utterly crush the Hero Faction which are each individually at a High Ultimate-Tier Devil level. The two strongest beings, Ophis and Great Red, are represented by Infinite and Dreams which say volumes of how strong they are.]]
%%* PintSizedPowerhouse: Koneko.
* PlotTriggeringDeath: Issei's death at the beginning of Volume 1 kickstarts the plot.
* {{Polyamory}}: Could be called "Polyamory The Anime", at least during the SliceOfLife segments. All of the girls love Issei, are aware of each others feelings, and not only does this not bother them, but in many cases they'll support each other in their attempts to get closer to him.
* PoweredArmor: Yes, it actually does exist in the series; Issei and Vali's Balance Breakers are basically it.
* PowerIsSexy: According to Ddraig, anybody who possesses the power of dragons instantly becomes a ChickMagnet because of this trope. He even describes to Issei that one of his past users slept with a lot of women.
* PowerLevels:
** Vali invokes this to Issei that the latter is ranked somewhere in the 4 digits and that Sirzechs won't enter the top 10.
*** According to [[WordOfGod Ishibumi]], this is who Vali meant when he referred to the top 10. Disregarding [[StoryBreakerPower Great Red]], we have (in no particular order): [[spoiler:Ophis (before her {{Nerf}}), Shiva, Vishnu, Brahma, Śakra, Thor, Typhon (or Fenrir and this is before its {{Nerf}}), Hades, Aten, and Lugh.]]
** The devils also have a strength tier with ultimate being the highest level and low-level devils being the lowest. In a subversion, however, the entire Occult Club with the exception of Rias are all low-level devils and they are all considered with the exception of [[TheMedic Asia]] and Gasper [[spoiler:until his CurbStompBattle with Georg]] to be high-level devils if not stronger. Ironically Rias herself ends up as one of the weaker members with most of the rest of the Occult Club surpassing her.
* ThePowerOfHate: The [[HumongousMecha Maouga]] ''runs'' on it as it's power source.
* ThePowerOfLove: Issei is powered by a combination of lust and genuine love/care for his friends. However, in a slightly surprising twist, him calling on the power of love is generally a horrific, bloody, and all around terrifying experience. Asia's [[spoiler:apparent]] murder by Shalba triggered Juggernaut Drive, which nearly caused him to kill all his friends. Ravels kidnapping meant he no longer cared what happened to {{Mooks}} in his way. [[spoiler:His parents being taken]] nearly drove him insane with rage. In short, the PowerOfLove is invoked when the object of love is ''threatened'', and used to ensure whatever threat existed ceases to do so immediately.
* PowerPerversionPotential: Why else would Issei invent [[TheNudifier Dress Break]] during his training time?
* PrettyFreeloaders: Asia is the first one who stays at Issei's home, then later on it's Rias, Akeno, Koneko, Xenovia, Irina, and Rossweisse who stay with him while Kiba and Gasper rent a house near them. [[spoiler:Kuroka and Le Fay also get in on the action in the most recent novel.]]
* PropertyOfLove: As his master, Rias calls Issei her possession and says that he belongs to her only.
* {{Pun}}: Upon seeing [[CosplayOtakuGirl Serafall Leviathan]], one of the Four Satans, Issei dubs her a "Maou Shoujo". [[note]]Demon King Girl, as opposed to Mahou Shoujo, Magical Girl.[[/note]]
* RadialAsskicking: The Occult Research Club ''was'' going to do this, until [[BigDamnHeroes Odin showed up.]]
* RagsToRiches: Issei's home gets renovated from a normal Japanese house to a ''six-floor mansion overnight.''
* ReallyGetsAround: Issei wants to(In EX reveals in the future he does), Riser already has, and finally Issei's mentor Azazel had one in the 1000s (harems not women).
* RedBaron: A lot. Generally all the high-level fighters have some sort of terrifying nickname. Funnily enough, Issei is called the [[spoiler:Breast Dragon Emperor]] which brings Ddraig no small amount of agony.
* RedOniBlueOni:
** Issei is perverted and easily-angered, while Vali is seen as calm and collected.
** Rias and Akeno also follow this trope. Rias is a fire-willed redhead who'll go on a fit if anyone of her peers are hurt (''especially'' if it's Issei), while Akeno - when in non-sadomasochist tease mode - is a bonafide YamatoNadeshiko.
* ResetButton: ''EX'' for ''[=BorN=]'', as Issei's children from the future travel back into the past to defeat Loki and undo his efforts in creating the AlternateContinuity and has essentially made the first and second seasons canon. By the end of ''EX'', [[spoiler:Loki is captured, the Underworld Lifeforms are defeated, the Chichigami survives and Issei's children return to the future]].
* RuleThirtyFour: Hoo boy... While there's the CantHaveSexEver clause the author has to follow, fans are happy to give Issei some (well-deserved) coitus. All in all, this series is very much "Rule 34-friendly".
** RuleThirtyFourCreatorReactions: Ishibumi himself seems to support ''[=DxD=]'' erotica, even jokingly stating that he's gotten enough red-lights material from his fans to write boatloads of hentai doujins, or even make actual sex scenes with Issei and his haremettes if it wasn't for the ExecutiveMeddling.
* RuleSixtyThree: An InUniverse example, thanks to Azazel's gender-swapping gun in one of the short stories.
%%* SchoolIdol: Rias, Akeno, Sona, and Tsubaki in that order.
* ScrewThisImOuttaHere: In Volume 1, [[spoiler:Freed's reaction to Raynare's defeat is to get the hell out of dodge]].
* SealedEvilInADuel: In Volume 21, [[spoiler:most of the faction leaders and their subordinates use their powers to trap both themselves and Trihexa and fight it off]].
%%* {{Sentai}}: Maou Sentai Satanranger!
* SequelHook: The mere mention of the Vanishing Dragon (Vali) at the conclusion of the anime made everyone jump for joy and wanted a second season. [[spoiler:It happened]].
* SerialEscalation: How ''much'' can Issei power up using Rias's breasts!? How much HolyShitQuotient are the fights in this series!? Which mythology will be the next one introduced!? ''What kind of new perverted power-up can Issei pull off next!?'' [[RuleOfCool Yeah it's]] [[WidgetSeries that kind of series.]]
* SetRightWhatOnceWentWrong: In a nutshell, the main plot of ''EX'' is Azazel's quest to avoid the BadFuture by sending Issei's {{Spin Offspring}}s back in time in order to stop the events that would lead to ''[=BorN=]''.
* SexyWhateverOutfit: The girls typically in the opening/closing, if they're wearing anything at all, particularly the 2nd ending in season 2.
* ShoutOut: Has grown enough to warrant it's [[ShoutOut/HighSchoolDxD own page]]
* SickEpisode: One of the short stories in volume 13 has Issei becoming sick after catching a flu for devils and dragons.
* SlidingScaleOfIdealismVersusCynicism: Despite having some cynical traits such as the Occult Research Club's members' {{Dark and Troubled Past}}s, the series stays idealistic for the most part. After all, seeing Angels, Fallen Angels and Devils all getting along and willing to work together isn't something you see every day.
* SlidingScaleOfSillinessVersusSeriousness: The series slides across both ends of the scale, but stays silly for the most part.
* SmugSuper: Akeno seems to be always putting up a smile in battle.
* SomedayThisWillComeInHandy: Back in volume 4, Sirzechs asks Issei what would happen if Issei used Gift on Rias's breasts then tells the latter not to worry about it, which obviously makes Issei think of a lot of crazy outcomes on what will happen. It mostly gets forgotten, until [[spoiler:Volume 11 where the spirits of the past users of Boosted Gear bring it up again. It replenishes Issei's aura at the cost of Rias's breasts shrinking.]]
* SpinOffspring: [[spoiler: This is basically what the ''EX'' spin-off is about, with the children of Rias, Akeno, Xenovia, Koneko, Irina, and even Kuroka showed up so far]].
* StatusQuoIsGod:
** Averted with a ''passion''. Everything can and will change, and it's one of the series best aspects.
** The uneasy truce is resolved peacefully and strengthened into an actual alliance. The enemies that oppose it are dealt with permanently, and few are allowed a second shot.
** The fated rivalry between the dragon emperors is broken because Ise and Vali are their own people, and treat their partners with the same respect.
** The characters constantly improve themselves and their abilities, removing any DramaPreservingHandicap as soon as possible
** The romantic situation takes advantage of this as well, with Ise and Rias officially going out less than halfway through the series.
* {{Stripperific}}: The outfits the girls wear in the ending for season 1. The second ending of Season 2 takes it up a notch.
* StoryArc: There are four main story arcs in the series.
** The Red Dragon Emperor's Awakening (Vol. 1 & 2)
** Birth of the Breast Dragon Emperor (Vols. 3-6)
** The Heroic Oppai Dragon (Vols. 7-12)
** The Legend of Oppai Dragon and his Lively Companions (Vol. 14-21)
** Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star: The True Dragon(s) of the Kuoh Academy (Vol. 22-?)
** Short Story collections (Vols. 8, 13, and 15)
* StoryBreakerPower:
** [[spoiler:Ophis displays zero interest in fighting, because if she ever got serious, she would destroy every opponent easily and thus finds fighting with anybody except Great Red pointless. Even when weakened to around 25-50% of her true power, she's still double the strength of the two Heavenly Dragons]].
** [[spoiler:And even she ''pales'' compared to what Great Red can do. He combines with Issei, made him {{Kaiju}}-sized, and told Issei to use his DangerousForbiddenTechnique (Longinus Smasher), and with some assistance by Grayfia and her group just to launch the enemy in the air, ''[[ThereIsNoKillLikeOverkill obliterates]]'' the giant monster who has an [[GoodThingYouCanHeal instant regeneration]]. All Issei could say after that was "Amazing".]]
** [[spoiler:There's also Son Wukong, who easily blocked the True Longinus with one finger and forced the entire Hero Faction to retreat.]]
* {{Stuffy Old Songs About The B|uttocks}}oobs: The "Oppai Dragon" song, big time.
* SuperPowerLottery:
** Various from Sacred Gear to Sacred Gear. Kiba has the the ability to create swords with any special element he wants. Vali could Divide someone's power by two every ten seconds and Issei could double his own power by two every ten seconds. [[TimeStandsStill Gasper could stop time]]. Then there's Cao Cao who has the True Longinus that has 7 abilities which are all utterly broken such as the ability to destroy all weapons and a AttackReflector.
** Also besides Sacred Gears there are people that are born into a special lineage which gives them special power exclusive to their family. Rias's family has the [[ExactlyWhatItSaysOnTheTin Power of Destruction]], for example. Vali once again wins this lottery because he is the descendant of Lucifer thus he has great magic power that further boosts the power of his Sacred Gear by allowing him to feed his magic power for [[DangerousForbiddenTechnique Juggernaut Drive]] which allows him to be the only person that could use this ability without drawback.
* SupportingHarem: All the girls know that while Issei may love each and every one of them, Rias is the one to hold the title "legal wife". Doesn't mean that they'll let her get all the attention however.
* SurroundedByIdiots: Angels, Fallen Angels, and Devils all suffer from this early in the series. The first few story arcs present the Fallen Angels as the default villains, but the leaders of all three factions are cool guys entirely willing to get along, while most of the trouble gets stirred up by their overzealous or rebellious subordinates. Largely phased out as they become TheAlliance in favor of more external threats.
* TakeThat: Zatuji, the "Familiar Master" in Episode 7. He is a middle-aged man who dresses and talks like Ash Ketchum/Satoshi is a not-too-kind jab at the {{Anime/Pokemon}} fandom, particularly adults who refuse to "let go." Ironically, the author admits that he's a fan of Franchise/{{Pokemon}} in the volume 8 afterword, and his artist told his editor to make that story.
* TalkingIsAFreeAction:
** When Issei first uses Balance Breaker, Ddraig warns him that it's only good for 10 seconds because Issei can't handle the stress of Boosted Gear. Yet, when he's fighting and talking against Riser, their conversation lasts ''for a few minutes'' while Ddraig is counting the number of seconds till Balance Breaker is up.
** The Anime fixes this, mostly by having Ddraig say he'll "count to ten" without actually specifying seconds. His count during the action is slower than seconds, but consistent, and the talk between Issei and Riser is much snappier.
* TeethClenchedTeamwork: The Khaos Brigade, in general, is this. Ophis may be [[PuppetKing the overall leader]], however the three main groups have different agendas. Vali's group is the closest one who wants to fulfill Ophis' wish to kick out Great Red from the dimension gap only because Vali wants to fight the strongest being. The Old Satan Faction only uses Ophis to regain Hell and wage another ForeverWar to prove that the devils are the strongest. The Hero Faction just wants to wipe out all the mythologies and prove that they're heroes.
* ThemeMusicPowerUp: In-universe. Also doubles as a RunningGag.
-->''"Zoom Zoom Iyaaan."''
* ThereIsOnlyOneBed: Rias sleeps naked in Issei's bed and at that point, the latter doesn't love the former.
* ThoseTwoGuys: Matsuda and Motohama.
* AThreesomeIsHot: The suspiciously accurate details the ''Ex'' chapter gives about Koneko's and Kuroka's children [[GettingCrapPastTheRadar heavily implies]] they were conceived on the same night.
* TigerVersusDragon:
** Issei vs. Vali. The stubborn, passionate, and perverted as the Tiger. The cold, orderly, and sophisticated Vali as the Dragon.
** Same goes with Rias vs. Akeno whenever they have a CatFight starting from Volume 4 onwards (episode 7 of season 2 in the anime). The easily jealous, childish Rias is the Tiger, and the calm, sadistic Akeno is the Dragon.
* TimeTravel: In ''EX'', Issei's children have to travel to the past to stop Loki before he wreaks havoc on the timeline and creates the events of ''[=BorN=]''.
* TorpedoTits: Viser, the exiled devil in episode 3, fires ''lasers'' from her nipples.
* TournamentArc: How a Rating Game works. In Volume 22 The International Ratings Game takes this to a whole new level.
* TownWithADarkSecret: Kuoh town might seem like a fun place to live, but [[spoiler: before Rias was in charge, let's just say a lot of problems have sprung up that came back to bite everyone else in the fourth arc.]]
* TrainingFromHell: Rias's training of Issei is nothing but this. Later on, he gets subjected to this by Tannin who trains him ''literally'' in hell.
* TrivialTitle: "Highschool [=DxD=]". The story takes place at a high school, so the first part is justified, but "[=DxD=]"? Well, apart from being a StealthPun[[note]]"[=DxD=]" > "DD" > "[[BuxomIsBetter Double-D]]"[[/note]], the title does come up a few times - firstly as the title of Great Red, the "Dragon of Dragons", and secondly as the name of a team created in Volume 16. In Volume 20 Issei's new form is called DxD.
* ATruceWhileWeGawk: In volume 7 while an epic battle is going on, Issei somehow [[spoiler: summons a breast god]] (yes, there is apparently one in the universe). When he announces this, ''everyone on both sides stop fighting'' and start staring at him as if he's done something stupidly crazy again...
* TrueCompanions: The Occult Research Club.
* TugLoverWar: A mild example in the opening credits of Akeno VS Asia with Issei as the prize.
* TwelveEpisodeAnime: Averted with the [[BonusEpisode 13th episode]] [[spoiler:and an upcoming 14th episode]]. It gets taken UpToEleven with it being written by [[WordOfGod Ishibumi]] himself.
* TwoTeacherSchool: The only teachers who are even active in this school are Azazel and Rossweisse. The only other one was an English teacher who was only there for one scene.
* UltimateShowdownOfUltimateDestiny: All the different mythologies are in this series, and the only thing that's keeping them from waging war with each other is that TheAlliance (devils, fallen angels, and angels) wants to make peace with other mythologies. According to [[Myth/HinduMythology Sakra Indra]], the other mythologies may be cooperating on the surface, but deep down they want to destroy the other mythologies.
* UnPerson: In ''EX'', when Loki and the Underworld Lifeforms wreak havoc on the timeline, they make sure that the Chichigami is killed, but it eventually comes undone thanks to the efforts of Issei's children.
* UnprovokedPervertPayback: Despite numerous amounts of {{Fanservice}}, this show ''[[AvertedTrope averts it]].'' Hell, even Issei expected that Rias was going to hit him when [[spoiler:she caught Koneko and him naked. Turns out, Rias just examined Koneko and stated that she needed a doctor.]]
* UnwittingInstigatorOfDoom: Azazel is indirectly responsible for Raynare causing Issei's PlotTriggeringDeath at the beginning of the series [[spoiler:and causing friction between Baraqiel and Akeno after Shuri's death]].
* UnwittingPawn: [[spoiler:The Occult Research Club to Vali in Volume 7 seeing as the latter wanted Fenrir on his side, thereby fighting alongside them, and the Hero Faction in general to Hades.]]
* {{Valkyries}}: They exist in the universe, as Odin is a character within the story [[spoiler:Later on, one of those Valkyries becomes Rias's new Rook, Rossweisse.]]
* WeakenedByTheLight: At the beginning at least, any new reborn devil is apparently weak from sunlight. And then of course, there's the LightEmUp attacks.
* WhamEpisode:
** Episode 4 of ''[=BorN=]''. During the battle against Loki, Issei and the others do battle against his minions. Mjolnir then arrives, and Issei is the only one present strong enough to wield it. [[spoiler:As he goes for it, Fenrir leaps up and bites him, severely wounding him in the process.]]
** Volume 20 of the light novel has [[spoiler:Issei's parents be revealed of what Issei has become over the course of the series (See Broken Masquerade above) and Trihexa, a being that is theorized to possibly be able to kill Great Red, of all beings, is finally awakened.]]
** Volume 21 ensures that NothingIsTheSameAnymore. [[spoiler: In order to ensure Trihexa doesn't escape from its new seal, most of the faction leaders and their subordinates seal themselves with Trihexa [[SealedEvilInADuel in order to battle it]] for who knows how long. This includes Sirzechs, Serafall and Falbium and their peerages (minus the Queens), Michael, Raphael and Uriel and their Brave Saints (minus the Aces), Azazel, Odin and Zeus. And to top it all off, [[BrokenMasquerade the media caught the battles in the human world, exposing the existence of the supernatural]], and Rizevim and the Evil Dragons threw one last middle finger at the good guys by establishing contact with another dimension and sending information on teleportation techniques across, meaning that according to estimates, interdimensional war is imminent in thirty years.]]
* WhamLine:
** In Volume 3 (New, Episode 6), Kokabiel's big reveal to the group: "In the Great War, the Four Great Satans died, [[spoiler:[[GodIsDead and so did God]]!]]" ''Everyone'' has an OhCrap moment after hearing this, and it causes a HeroicBSOD for Xenovia.
** [[spoiler:Kiba delivers one at the end of volume 11: ''[[OurHeroIsDead "That day, we lost Issei-kun."]]'']]
* WhatDoesSheSeeInHim: It has been stated throughout the story from people from school are wondering why Rias and Asia are close to Issei [[spoiler:later on Koneko, a church assassin named Xenovia, another church assassin-turned-angel named Irina, Akeno, and Ravel Phenex]]. If only they knew the crap he went through for the girls.
* [[WholeEpisodeFlashback Whole Volume Flashback]]: While interspersed with current events, the entire Volume Fifteen will talk about the different pasts of other characters and other events that was never mentioned in the light novels.
* WillTheyOrWontThey: [[spoiler:Rias does love Issei, but it takes 10 light novel volumes before he finally says it back to her. Might have something about his dying on his first date issues.]]
* WingedHumanoid: Everyone that's on one of the three factions. The Angels and their Fallen former comrades have the feathery kind (normal angels have white wings while those of Fallen Angels are black), Devil wings are more bat-like [[spoiler:or perhaps Draconic]].
* WorldOfBadass: It's much easier to count off the nonhumans who can't kick ass and take names. The only protagonist who can;t hold her own in a fight is Asia, who more than earns her keep as TheMedic and TheHeart.
* WouldHitAGirl:
** Pretty much almost every male in this series has no problems fighting against women at all (which is ''refreshing'' to say the least). Also, we don't get a loser protagonist who sits there and lets the resident {{Tsundere}} whoop his ass at the slightest infraction.
** That said, Issei is still punished quite often for his perversions, usually by Koneko. It still manages to sidestep the UnprovokedPervertPayback trope since Koneko does only lash out when provoked, and Issei takes the blow because he can be a sport when he knows he deserves it.
* WoundedGazelleGambit: This one devil ruins an angel's life by suckering her into healing him - which is taboo for angelic healers of the church. [[spoiler:Said devil gloats in Asia's face about this in volume 6.]]
* XanatosSpeedChess: Well, the Rating Game is a team battle that involves adjusting the strategies in response to the opponents actions.
* XMeetsY: ''Manga/ToLoveRu'' meets ''Franchise/ShinMegamiTensei'', with a little bit of ''ComicBook/ScottPilgrim''.
* YouAreWorthHell: Issei went through a lot of crap to rescue Asia. ItsALongStory.
* YouCantGoHomeAgain:
** Asia is unable to return to the Church due to Diodora's actions.
** Likewise with Xenovia, who was exiled from the Church due to her learning that GodIsDead.
** After Shuri's death, Akeno is unable to return to the Himejima Clan due to her Fallen Angel blood.
* YouHaveOutlivedYourUsefulness: [[spoiler:Happens to a bunch of kids that were part of an illegal, forced experiment to wield holy swords. Turns out none of them were able to do it, and when the project was discovered later, it was shut down, and the kids were exterminated instead of freed. Kiba was one of the children, and the others sacrificed themselves in order to give him a chance to escape. He later vows {{Revenge}} for them, and Rias takes him in so that he could serve her instead of dying in the forest.]]
* YourApprovalFillsMeWithShame: Ddraig isn't taking the nickname [[spoiler:Oppai Dragon]] everyone gave him very well due to how Issei uses his power.
* YoureNotMyFather: At first, Akeno is unwilling to forgive her father Barakiel [[spoiler:due to his part in not preventing Shuri's death]] and refuses to acknowledge her relationship with him.
[[/folder]]
----
-> '''[[JustForFun/StatlerAndWaldorf Waldorf]]''': This pervert right here has been reincarnated a devil, and he still continues his antics.\\
'''Statler''': What did you expect? He's a [[HornyDevils horny devil]]!\\
'''Both''': Doh-ho-ho-ho-hoh!

->'''''[[FanService Oppai!]]'''''