[[quoteright:233:http://static.tvtropes.org/pmwiki/pub/images/smallhidannoaria_3363.jpg]]
[[caption-width-right:223: She's small, [[BadassAdorable adorable]], and can [[ActionGirl kick your butt]].]]

Kinji Touyama is no [[OrdinaryHighSchoolStudent ordinary high school sophomore]]. Whenever he is "stimulated" by events around him, he switches into a sort of SuperMode called "Hysteria Savant Syndrome", shortened as "HSS" or also called "Hysteria Mode". Kinji attends Butei High School, a paramilitary academy specializing in assault, reconnaissance, escort, etc. -- specifically, the offensive-oriented Assault Section. However, thanks to a certain incident, Kinji demoted himself to the more rear-line Inquesta Section and is planning on quitting Butei High altogether. One day, however, he narrowly falls victim to a serial bomber called the "Butei Killer", and his life is thrown into a shock again, with the entrance of one of Assault Section's top students, the diminutive Aria H. Kanzaki.

''Hidan no Aria'' (''Aria the Scarlet Ammo'', according to the subtitle, or more accurately ''Aria of the Scarlet Bullet'') is a HaremSeries, but also with plenty of action and thrills. Starting as a LightNovel, a manga adaptation is ongoing in the Monthly Comic Alive, and an anime series adapted by JCStaff was released in [[Spring2011Anime spring 2011]]. It also has a spinoff manga, ''Hidan no Aria AA'', focusing on Akari Amamiya, a first-year Rank-E Butei and Aria fangirl who strives to be on equal footing with her beloved "Aria-sempai".

The series is licensed for simulcast streaming by [[http://beta.funimation.com/aria-the-scarlet-ammo Funimation]] and can also be watched on [[http://www.hulu.com/aria-the-scarlet-ammo Hulu]].

Aria, Hotogi, Jeanne, Reki and Riko are also part of the cast in ''VideoGame/SuperHeroineChronicle''.

'''Note: Spoilers for all three mediums are here!''' There are currently 15 light novel volumes; the anime covers only the first 3 and the manga is currently covering the 4th.
----
!!Tropes in ''Hidan no Aria'' include:
* AbsurdlySharpBlade: Shirayuki's sword is pretty sharp due to it being made with a special metal.
* ActionGirl: Shirayuki, Aria and Jeanne.
** KatanasAreJustBetter
* AcademyOfAdventure: Butei High, naturally.
* TheAce: Aria. She can be a one-girl assault team, able to handle any situation with nary a sweat, catch any criminal, so on and so forth... but [[LethalChef can't cook]].
* ActionPrologue
* AllLoveIsUnrequited: Not that Kinji can't choose a girl -- it's just his HSS (that turns him into a ChivalrousPervert) that makes it harder. Not to mention that said girls have a tendency to try to kill each other using their elite training, magic powers, and weapons... with Kinji always caught in the crossfire.
* AlmightyJanitor: Kinji is just a bottom-of-the-barrel Rank E (in contrast to Aria, a top-dog Rank S), just wants to be normal, attends the information-gathering Inquest Side, and usually gets pushed around a bit by females. But he's just Rank E on official records -- amongst his friends in Assault Side he is known as a {{Badass}} unofficial Rank S, turns into a ladies' man under HSS, and has an army of {{Action Girl}}s willing to do anything for him.
* AlternateCharacterReading: Abused, along side GratuitousForeignLanguage, to the point where it's not even funny. Some examples are the various Butei specilizations, and an entire section in the fifth chapter of Volume 4.
* AlwaysSaveTheGirl: Kinji obtains this mindset in HSS.
* AmazonBrigade: The Ulus Tribe, a 47-woman tribe [[spoiler:of which Reki is a member]].
** Hotogi Mikos are another case -- all female, each with weapon and supernatural training on their disposal.
* AnimalMotifs: Aria and cats. Evidence are the Leopons, the random purrs in some scenes involving her, and Aria even growling like a cat whenever she's extremely pissed off. In episode 6 Shirayuki even calls her a "thieving cat" for (supposedly) taking Kinji from her.
* AnimeChineseGirl: Koko[[spoiler:, all three of them]]
* AnnoyingYoungerSibling: Shirayuki's younger sister, Konayuki.
* ArousedByTheirVoice: [[spoiler: Riko imitates Aria's voice to get Kinji into Hysteria Mode via radio, and succeeds.]]
* AttractiveBentGender: [[spoiler:Kinichi, Kinji's NotQuiteDead older brother, as Kana. [[http://www.baka-tsuki.org/project/index.php?title=File:Hidan_no_Aria_03-291.jpg Quite a beauty, eh?]]]]
* {{Badass}}: [[WorldOfBadass Everyone]] in Butei High, but Kinji gets a special mention. The reason many in Assault Side admire him is due to his performance in the entrance exams -- while under HSS, he completed his assigned task -- capturing students in a 14-storey building -- in a few minutes, defeating six teachers in the process. The fact that [[BadassTeacher the teachers themselves have military experience]] only adds to his reputation.
** [[BadassNormal Even when not under the influence of Hysteria Mode, he shows remarkably good judgement in combat situations, and is capable of intimidating a large number of thugs]].
* BadassAdorable[=/=]ActionGirl: Any Butei Girl, but especially Aria, Shirayuki, and Riko.
* BadassTeacher: Butei High's teachers are some of the youngest of their kind, also they're rumored to be former assassins, soldiers, specialists, special forces, etc... and they might still have ties to their former careers.
* BarehandedBladeBlock: Aria performs one in the beginning of episode 6. Kinji even bothers to [[LampshadeHanging hang a lampshade on it]].
** And then Kinji does it himself two episodes later.
** In the novel, he did with ''two fingers''. And later, he uses a variant of the technique [[spoiler:to redirect an oncoming bullet.]]
* BattleCouple: Kinji and any girl who fights alongside him, but primarily Aria.
** Taken further back when a character reveals a certain past [[spoiler: Tamano (see below in older than they look) tells us that Kinji and Shirayuki's great great grandparents fought alongside each like this.]]
* BayonetYa: Reki is a sniper, so she doesn't carry sidearms. However, she always keeps a bayonet in case she has to fight on melee.
* BeethovenWasAnAlienSpy: [[spoiler:JoanOfArc (Jeanne the 30th's ancestor, [[CaptainObvious duh]]) was an Abilty User -- specifically AnIcePerson -- which helped her survive being burnt at the stake.]]
* BerserkButton: Lets see...
** Aria: Do ''not'' make fun of her flat chest, her childish appearance, her lack of grace, or Kinji, much less be Riko. She'll blast a hole in you, unless you're bulletproof, in which case she has alternative methods.
** Kinji: Do not hurt women (especially if he's in Hysteria Mode), talk badly of [[spoiler:his (supposedly) dead older brother]], hurt his friends, or even try to kill him.
** [[spoiler:Riko]]: Do not call her [[Franchise/LupinIII Lupin the 4th,]] control her life, treat her as anything but an individual, be Aria, or disobey her once she gives an order.
** Shirayuki: Do not be a girl near Kinji (especially Aria) or try to kill him, much less seduce him... Long story short: don't do ''anything'' with/to Kinji.
* TheBerserker: Oddly enough, [[YamatoNadeshiko Shirayuki]].
* BettyAndVeronica: Towards Kinji, Aria (and, to a lesser extent, Riko) is the Veronica to Shirayuki's Betty.
* BigDamnHeroes: In episode 3, when the bus with a bomb is heading for downtown, Aria is unconscious, and all seems hopeless, when Reki appears in a helicopter and snipes the bomb on the bottom of the bus.
** Aria saves Kinji later against Durandal.
* BigEater: Aria wolfs down [[http://2.bp.blogspot.com/_R65-P45gkpA/SRg8NLavwWI/AAAAAAAABAQ/wFW545cKz5Q/s1600-h/Picture+626.jpg peach buns]] like there's no tomorrow. And as it turns out [[spoiler:Reki]] can be one as well.
** Riko in comparison seems to be a Big Drinker, with her drinking 20 packs of strawberry milk.
* {{Bishonen}}: Kinji is a borderline case; played straighter with his best friend Ryou, who has a legion of {{fangirl}}s.
* BlessedWithSuck[=/=]CursedWithAwesome: Kinji's Hysteria Mode, where he becomes a gigolo/ladies' man, but this isn't his ideal self. Made even worse as under this mode Kinji literally can't refuse any request a girl makes... 'ANY REQUEST'. Now think of the options ladies (and guys alike).
* BlondeBrunetteRedhead: Three major members of Kinji's harem: Riko, Shirayuki and Aria.
* BloodKnight: Whether or not [[spoiler:Riko's]] hatred for Aria comes into the equation, she really ''really'' enjoys combat [[InterplayOfSexAndViolence a little too much.]]
* BloodlessCarnage: Justified by a very advanced ballistic weave in the uniforms for Butei students, which is capable of stopping even the hottest pistol-caliber loads at anything greater than point-blank range. It's not known whether it can withstand rifle ammo, however. Averted in the case of unprotected areas.
* BornLucky: Kinji [[spoiler:or it could be Reki; examples are Kinji winning a lottery due to her presence, getting free food for Reki, and having Reki complete an event despite lacking the money to buy her a dress.]]
* BornInTheWrongCentury: [[spoiler:Kinji]] notes that Jeanne has shades of this. She is very formal, sends letters with wax seals, wields a zweihander (two-handed sword), wears plate mail, doesn't know what a vending machine is, and dislikes skimpy clothing (even school uniforms). [[spoiler:May be justified by [[NaiveNewcomer being unused]] to seeing the world outside [=I-U's=] auspices.]]
** Shirayuki also counts due to her upbringing, choice of weapons, personality... well, except for that [=M60=] she occasionally brings out against rivals for Kinji's affection.
* BreakTheCutie: Holy hell, [[spoiler:Riko]]. [[spoiler:She lost both her parents at age 8, only to be taken in by Vlad, who proceeded to shut her inside a prison cell, taking away her precious rosary (a gift from her mother) and depriving her of even the most basic needs. One botched escape attempt resulted in severe punishment for her, until she was forced to join I-U and slay a Holmes in order to break free of Literature/ArseneLupin's legacy and take back her rosary, her identity and her freedom.]]
* BromanticFoil: Gouki for Kinji.
* BulletTime: When Kinji enters Hysteria Mode.
* BulletproofVest: Butei ''school clothes'' are made from bulletproof materials, and they also have SWAT gear if things go dangerous.
* BunnyEarsLawyer: Riko has an obsession with {{H-Games}}. She also happens to be Butei Academy's most reliable KnowledgeBroker.
* ButNotTooForeign: Aria has some British heritage in her, which is why she has a middle name.
* BystanderSyndrome: Butei teachers are hands-off when it comes to a student's problems. After all, they're expected to help themselves and [[TrueCompanions each other out]].
* CatchPhrase
-->'''Aria:''' "I'll blow a hole through you!" or "I'll pump you full of holes!" in the English dub.
-->'''Reki:''' "I am a single bullet. It has no heart. Therefore, it does not think. It just flies straight towards its target."
* CanisMajor: Haimaki is a giant Central Asian wolf and Reki trained him to obey her in less than 5 minutes.
* CatSmile: Riko tends to display one for the mischievous aspect.
* CensorSteam
* ChickMagnet: Kinji, by some miracle, keeps getting girls, and what's funnier is [[ActionGirl they all excel in at least one area of combat]]. He can probably even form his own elite strike team if this keeps up.
** [[spoiler: As of novel 7 said team actually exists.]]
* ChildProdigy: Aria is one -- [[spoiler:after all, considering her ancestor...]].
* ChivalrousPervert: Hysteria Mode Kinji.
* ClingyJealousGirl: Aria and Shirayuki are willing to attack anyone who tries to take him away.
* [[ClownCar Clown Car Plane]]: That 737-350 under JustPlaneWrong has a LOT of things that would not fit within the narrow fuselage of an actual Boeing 737.
* ColdSniper: Reki.
* CombatTentacles: Well, ''ponytails'' used with the same articulation of actual tentacles, but that's what [[spoiler:Riko's]] hair technically is.
* CrapsackWorld: The series shows some shades of it -- Butei was originally formed as a reaction to skyrocketing crime, featuring teenagers carrying concealed weapons, wearing bulletproof school uniforms, and functioning like police officers.
* CryCute: Aria (as expected of a RieKugimiya role) -- [[spoiler:in one instance, after visiting her incarcerated mother and seeing how the police treat her more like a common criminal than a mere suspect, she was trying to fight back her tears before Kinji, only to burst out crying in the middle of a crowd seconds later; in another instance, she tears up after Kinji (initially) refused to accept her offer to resume their partnership]].
* CurtainsMatchTheWindow: Riko has this.
** Arguably Aria. [[spoiler:In this case, it was justified by [[AppliedPhlebotinum the Hihiirokane]], since she originally had blond hair and blue eyes, but she was [[TimeTravel time-warped shot]] the 'Scarlet Ammo', which slowed her growth and reddened her hair and eyes.]]
* CustomUniform: Riko modified her uniform to make it more Lolita-style. [[spoiler:It also acts as an impromptu parachute.]]
* CuteBruiser: Aria
* CuteLittleFangs: Aria
* CuteWitch: Jeanne
* DaddysLittleVillain: [[spoiler:Hilda Dracula, Vlad's daughter, begins to attack the gang in Volume 8-9 of the light novels.]]
* DarkAndTroubledPast: Where the hell do we begin...
** Kinji: [[spoiler:His brother Kinichi (apparently) died saving people from a sinking ship, only for the company to blame him for sinking it. He's heckled and looked down upon by other people for this, forcing him to mull leaving Butei High.]]
** Aria: [[spoiler:She's a descendant of one of the most famous detectives in the world, and a tool to be used, with her mother Kanae framed as the "Butei Killer".]]
** Shirayuki: [[spoiler:As a Hotogi she was unable to leave the shrine as a child, got severely punished for meeting Kinji, and was only able to attend Butei High due to her clan's approval. She's also never gone out to eat nor gone shopping with anymore...]]
** Riko: [[spoiler:As a ''failed'' descendant of [[Literature/ArseneLupin one of the world's most elusive thieves]] she's only known as Lupin IV to people who know her well, and as such she's kidnapped and held until she agrees to do the impossible and win back her identity and freedom.]]
** Reki: [[spoiler:Her native all-female Ulus Tribe can only give birth to females, thus they must find a strong male warrior (in her case, Kinji); they also surrender their sense of feelings to Irokane, explaining their [[EmotionlessGirl emotionless nature]], as well as their freedom -- they devote themselves fully to their husbands, even unto death.]]
* DeadpanSnarker: A lot of Kinji's commentary in the novels involves this, with him often noting the absurdity of the Butei way of life.
* DefeatByModesty: Riko manages to subdue Shirayuki quickly by lifting the latter's skirt.
* DefeatMeansFriendship: [[spoiler:Jeanne and Riko.]]
* DefrostingIceQueen: By the end of her visit Kinji managed to turn Konayuki (Shirayuki's [[AnnoyingYoungerSibling Annoying Younger Stepsister]]) from a man-hating Butei to another potential love interest. He even managed to make [[spoiler:Reki]] smile, if just for a moment. Now all these would be a good thing, except he has a {{Tsundere}} and a {{Yandere}} ([[DontExplainTheJoke Aria and Shirayuki, respectively]]) to worry about.
* DeusSexMachina: Kinji needs to be aroused to activate Hysteria mode.
* DontYouDarePityMe: A rare heartwarming twist on this trope: When Kinji and Aria helped [[spoiler: Riko]] defeat [[spoiler: Dracula]], hence reclaiming her freedom and dignity, she was clearly filled with love and gratitude for both of them. After a moment, her professional pride in her [[spoiler: Lupin]] heritage returned, forcing her to recompose herself and declare her rivalry towards them anew; albeit one built on respect rather than hatred this time.
* DoubleStandardAbuseFemaleOnMale: Aria tends to use this trope on Kinji.
* DualWielding: Aria. [[spoiler:Riko apparently can too.]]
** Though, for [[spoiler:Riko]], it's technically [[spoiler:[[UpToEleven Quad Wielding]]]]
** Volume 7 onwards introduces the third Quadra -- [[spoiler:none other than Kinji himself]].
* TheDulcineaEffect: Genetically inherited by Kinji.
* DynamicEntry: Has happened a few times, notable incidents involving Shirayuki first slicing the door and trying to kill Aria with a sword, second time pushing down the door and trying to [[StealthPun ventilate]] Aria with an [=M60=].
* EasilyForgiven: While Riko had her motives, it seems that Kinji and Aria overlook the fact that she tried to kill them earlier.
** Same thing with Jeanne.
* ElementalRockPaperScissors: SSR combat tends to fall into this category. From the only known battles so far fire>ice, and earth>fire.
* EmotionlessGirl: Reki, though mainly because she wants to have extreme accuracy when she shoots.
** [[spoiler: Apparently this is also an effect of the Riri-Irokane that Reki was exposed to in her home village.]]
* EpicFail: Hilda's nurse disguise in Volume 10.
* HairDecorations: Aria has hair clips, and Shirayuki and Riko have ribbons.
* EveryoneLooksSexierIfFrench: [[spoiler:Riko]]
* EverythingsBetterWithPrincesses: [[spoiler: Reki]] is a [[BadassPrincess princess]] who can [[RoyalsWhoActuallyDoSomething kick your ass]]
** To a lesser extent, Aria, too, considering that her grandmother was a Dame.
* CuteKitten: The two Leopons from the catching game machine in episode 3. They're so cute, they make Aria cuter. ([[spoiler:[[ChekhovsGun One Leopon attached to Kinji's cellphone ultimately made Kinji reconsider his decision to quit Butei High and resume his partnership with Aria.]]]])
* EveryJapaneseSwordIsAKatana: Contrary to what many seem to think, Aria's swords are not katanas, but a pair of much shorter wakizashis.
* EverythingSoundsSexierInFrench: Riko speaking French was very hot, to say the least.
* EvilCounterpart: [[spoiler:Riko]] to Aria.
** [[spoiler: To a certain extent the Kokos towards Aria, Reki and Kinji]]
* EvilLaugh[=/=]LaughingMad: [[spoiler:Riko at the end of Episode 4]].
* ExactlyWhatIAimedAt: Reki doesn't miss. Even "miss shots" are deliberate (like that one time she ''tamed'' Haimaki with a bullet grazing through its back).
* ExpressiveHair: Aria's IdiotHair.
* {{Expy}}: Aria, to an extent, of [[LightNovel/ZeroNoTsukaima every]] [[ShakuganNoShana flat chested]] [[Manga/HayateTheCombatButler loli-]][[LightNovel/ToraDora Tsundere]] role RieKugimiya has voiced, due to her RapunzelHair, her ZettaiRyouki, and her [[{{Tsundere}} attitude]].
** Reki can be considered one of {{Emotionless Girl}}s such as [[LightNovel/HaruhiSuzumiya Yuki Nagato]] or [[LightNovel/ZeroNoTsukaima Tabitha]] personality-wise.
*** Teenage girl, pale green hair, EmotionlessGirl behaviour, significant backstory arc to explain this (in the novels); she's very close to being a real ReiAyanamiExpy.
** Jeanne d'Arc the 30th's armor, sword and hairstyle may as well make her a silver-haired, French version of [[FateStayNight Saber Lily]] -- with [[AyakoKawasumi the same voice actress]] to boot, to near-CastingGag levels.
** In-series, the main girls -- Aria, Shirayuki and Riko -- have their first-year expies on the spinoff ''Hidan no Aria AA'' in the form of Akari Amamiya, Hino Raika and Shino Sasaki, respectively.
* EyeCatch
* FalseFriend: [[spoiler:How Aria saw Reki during Volume 6; when questioned, Reki charged at Aria with a bayonet intent to kill.]]
* FamousAncestor: Ooooh boy, we're in for a treat.
** [[spoiler:Aria is the great-granddaughter of Literature/SherlockHolmes.]]
** [[spoiler:Riko is the great-granddaughter of Holmes's archnemesis, Literature/ArseneLupin.]]
** [[spoiler:Jeanne is the distant descendant of, [[ExactlyWhatItSaysOnTheTin well]], Joan Of Arc.]]
** [[spoiler:Reki is the descendant of GenghisKhan, who also went under the name of [[http://en.wikipedia.org/wiki/Minamoto_no_Yoshitsune Minamoto no Yoshitsune]], a famous general in the 1100s.]]
** [[spoiler:Patra of I-U is descended from UsefulNotes/{{Cleopatra|VII}}.]]
** [[spoiler:Shirayuki is the descendant of and is actually named after [[http://en.wikipedia.org/wiki/Himiko Himiko]], legendary shaman queen of Yamataikoku.]]
** [[spoiler:Aya Hiraga descended from [[http://en.wikipedia.org/wiki/Hiraga_Gennai Hiraga Gennai]], a Japanese scientist in the 1700s.]]
** [[spoiler:[=KoKo=], one of the enemies of Volume 6-7, is a descendant of [[http://en.wikipedia.org/wiki/Cao_Cao Cao Cao]], one of the most legendary warriors of the [[RomanceOfTheThreeKingdoms Three Kingdoms]] period.]]
** [[spoiler:Elle is descended from Sherlock's assistant, [[TheWatson John Watson]].]]
** [[spoiler:Kinji himself is probably descended from [[http://en.wikipedia.org/wiki/Toyama_Kagemoto Toyama Kagemoto]], who appeared in several Japanese movies and live-action shows as Toyama no Kin-san.]]
* {{Fangirl}}: [[{{Bishonen}} Ryou]] has a lot of these.
* {{Fanservice}}: Expected of this kind of [[HaremSeries series]]. One notable example was when Kinji accidentally caught Aria leaving the shower naked. Another one is Riko reaching into her bra and showing almost everything down there.
* FearOfThunder: Aria is very afraid of thunder. [[spoiler:This does not help when she and Kinji are stuck on a plane during a storm, trying to save it from Riko.]]
* FeminineWomenCanCook: Shirayuki can cook and often does for Kinji. This contrasts with her less feminine rival, Aria, who cannot cook at all.
* FirstKiss: [[spoiler:Kinji and Aria, which also works as a ShutUpKiss for Aria to calm her down after she was revived from being critically hit by Riko, and a deliberate Hysteria Mode activation for Kinji.]]
** [[spoiler:Kinji also takes Shirayuki's to calm her down and of course, trigger Hysteria Mode]]
** [[spoiler:After receiving her crucifix back, Riko comments that she even sacrificed her first kiss for a chance to prove herself]]
* FiveManBand: Kinji and his four-person TrueCompanions, [[spoiler:also known as Team Baskerville]].
** TheLeader[=/=]TheLancer: Aria and Kinji frequently exchange both roles with each other depending on the situation. Aria has a dominating personality but Kinji is the one the others listen to.
** TheSmartGuy: Riko is the information gatherer given her skills with disguise and inflitration.
** TheBigGuy: Reki the sniper who never misses.
** TheChick: Shirayuki is a strange example. While spot-on in terms of personality (most feminine, a NiceGirl, LoveInterest, etc) her butei skills are with the sword and [[spoiler: fire magic]].
* FluffyTamer: Reki tames a giant wolf into submission ''using bullets'' in a few minutes.
* {{Foreshadowing}}: The anime OP has Aria waiting for a train at the [[http://en.wikipedia.org/wiki/Baker_Street_tube_station Baker Street Tube Station]] while glancing up at an outline of Literature/SherlockHolmes on the platform wall. [[spoiler:This foreshadows to the fact that she is his great-granddaughter.]]
** Reki's taming of the wolf can be viewed as this too, considering [[spoiler:her later method for 'catching' a husband...]]
* FrenchJerk: [[spoiler:Riko, though she's portrayed as more [[FreudianExcuse sympathetic]] and [[BrokenBird emotionally-shattered]] than most examples.]]
* FreudianExcuse: [[spoiler:Riko was forced to join I-U and became a Butei Killer in order to break free from her [[Literature/ArseneLupin great-grandfather's]] shadow, and her family (or rather, Vlad pretending to be one) constantly addressing her as "[Lupin] The Fourth".]]
* AFriendInNeed: Butei Chapter Article 1: "Trust in your friends and help when they need it."
* GagBoobs: Riko.
* {{Gainaxing}}: Riko's boobs were moving like crazy in the first episode, though she wasn't doing much.
** Apparently, at Butei High, the guys know her as "That loli with the huge tits."
** Also Shirayuki as a part if the cheerleading squad.
* GenerationXerox: [[spoiler:Four generations later, Lupin and Holmes are still pitted against one another, with one ordinary surrogate (or at least, he wants to be) in between.]]
* GeniusDitz: Aya Hiraga, Butei High's arms dealer, can modify any gun and sell most of the ammo they need. The catch: her modifications usually doesn't reach the client's desired settings (e.g.: Kinji orders a 3-round burst fire selector for his Beretta 92 Inox; her modification ultimately degrades from "up to 3 rounds per trigger pull" to "exactly two rounds per trigger pull").
* GenkiGirl: Riko, Aria around cute things or her favorite food.
* GenreSavvy: Riko is this for the HaremSeries. For example, one time, she called out Kinji to a karaoke bar, and when he began to discuss Aria, Riko told Kinji he needed to focus on her, because he was on the "Riko Route".
** Kinji too, to a lesser extent, due to his exposure to Riko. In Volume 7, Kinji even says [[spoiler:"In terms of Riko's games, it would be like entering "Reki's route."]]
** Also Shirayuki.
* GirlOnGirlIsHot: [[spoiler:Invoked by Riko to get Kinji into Hysteria Mode again in the battle against Vlad.]]
* GirlsLoveStuffedAnimals: Played straight with Aria and "Leopon". When Aria gets scared by thunder, Kinji brings out a Leopon and makes it talk to comfort her.
* GirlsWithGuns
* GunAndSword: Aria, though not at the [[GunsAkimbo same]] [[DualWielding time]].
** And later [[spoiler: Kinji]] mirrors Aria as the [[spoiler:Third Quadra]].
* GunKata: A variant of this style, known as "Aru-Kata" ("Aru" being spawned from the JP romanization of "Arma", Italian for weapon) is mandatory as per Butei cirriculum, The fight between [[spoiler:Aria and Riko]] in episode 4 showcases this perfectly.
* GunPorn: The novels go into a bit too much detail about the guns being used.
* GunsAkimbo: Aria and Riko.
* HammerSpace: Shirayuki's arsenal is either this, or part of her [[AWizardDidIt powers]].
*** Which is lampshaded in the spin-off [[{{Yonkoma}} manga]] ''Hidan no Aria-chan''.
* HandCannon: Kinji later carries a Desert Eagle Magnum as heavier fire power, [[CrazyPrepared just in case.]]
* HandicappedBadass: [[spoiler:Sherlock Holmes]], now over 200 years old, blinded by poisoning, but is still the leader of I-U. DidntSeeThatComing.
* HaremSeries: OK so far in the novel this is Kinji's choice: [[{{Tsundere}} Aria]], [[YamatoNadeshiko Shira]][[{{Yandere}} yuki]], [[TheQuietOne Reki]], [[LovableSexManiac Riko]], and Hina
* HeadphonesEqualIsolation: While they're not necessarily isolating, Reki wears a pair of these all the time to block out reality and have the best shots.
* HealingHands: [[spoiler:Shirayuki is able to do this because of her status as a {{Miko}}.]]
* HiddenDepths: [[spoiler:Riko]] is the first prominent example ([[spoiler:supposedly she just does bad things to continue her family's legacy (see entry for {Irony}} on this very page), but in reality she does so to free herself from the imprisonment, and she is not happy in the slightest with her fate]]), but many other characters qualify too.
* HighlyVisibleNinja: Hina Fuuma.
* HimeCut: Shirayuki
* HotSpringsEpisode: The OVA (Episode 13), which doubles as a field training consisting of Kinji, Aria, Shirayuki, Reki, Haimaki, Riko and Jeanne, with Tsuzuri-sensei as chaperone and Gouki as driver.
* HyperAwareness: Hysteria Mode.
* AnIcePerson: Jeanne d'Arc 30th.
* ICanExplain: Kinji gets this far in explanations before bullets/melee swings/magic powers start flying around destroying everything around him whenever girls who like/love/have a crush on him attack each other.
* IJustShotMarvinInTheFace: Egregiously, the quasi-military setting doesn't lead to an avoidance of this trope - even the teachers casually wave their guns into their students faces.
** Though this nearly happens at least once, such as in volume 10 when a first year was sleeping with a fully loaded revolver nearly hits Kinji when it falls.
* IJustWantToBeNormal: Kinji
** And later on this dream of his is completely shattered: [[spoiler:when you take down one of the most reclusive and dangerous organizations and win, they won't forget.]]
*** [[spoiler:Going farther in, they know who he is and what he looks like. If he goes to a normal school he's a sitting duck for them. At least in Butei he has [[TrueCompanions a lot of friends]] to watch his back.]]
* IKnowKarate: Riko; to a lesser extent, Aria knows her Baritsu Style [[spoiler:famously used by Sherlock Holmes]].
* IdentityAmnesia: [[spoiler:Kinichi, Kinji's supposedly-dead older brother, increasingly starts losing touch with his true self and begins to think he is his crossdressing alter-ego, Kana. Proof of this is when he was called "nii-san" by Kinji, unaware that the latter is referring to him.]]
* IdiotHair: Aria has one that hangs over her head.
* IGaveMyWord: Butei Chapter Article 2: "Complete a Client's Mission".
* ImplausibleFencingPowers: Butei High's SSR Side, who wield melee weapons, are capable of this. Just ask Shirayuki and [[spoiler:Jeanne]].
* ImprobableAimingSkills: Kinji, Kana and [[spoiler:Sherlock Holmes]] can easily do this in Hysteria Mode, but special mention goes to Reki: she can shoot an unlit clamp holding a bomb to the shadowed underside of a speeding bus... from at least 200m away and inside a pace-matching helicopter (think of the down draft on the bullet), through the siderails of the bridge that are flashing past several times a second... thus forcing the bomb to not only detach from the bus but bounce off the bridge to detonate harmlessly in the water. She is said to be able to shoot anything within a 2051-meter radius without missing.
** Later in the novel, [[spoiler:she easily shoots Kinji's jacket buttons regardless whether he is hiding in a building or in a bulletproof van. She can ricochet the bullet more than once or shooting the armored van's window in the exact same spot to break it and still hit the button without even harming or grazing Kinji. And she does all that with just a Dragunov, which usually has an effective range of 800m and without any support tools.]] When she said she can hit anything within 2051 meters around her, she wasn't kidding.
* ImprovisedParachute: Riko Mine has specially-made ''clothes'' that turn into a parachute. Leaving her flying across the sky [[MsFanservice in her underwear]].
* InTheBlood: Most of the cast is BadAss because their ancestors were, you know their names from FamousAncestor from up top. Also in-story their badassness took an even further upgrade due to the supernatural.
* IronicEcho: In Volume 3 of the LightNovel, Kinji tells Aria to mind "proper manners in the proper place" when she sits next to him during PE and tries to share a drink. A few paragraphs later he was [[NotWhatItLooksLike caught with his hand]] in [[spoiler: Riko's]] [[ThanksForTheMammary shirt]] trying to get the pen she stole from him.
* {{Irony}}: [[spoiler:Riko "Lupin the 4th" Mine was driven to break free of her unwanted legacy by attempting to kill Aria "Holmes the 4th" Kanzaki. Considering it's the same thing her ancestor did, the only thing she could prove by trying to do so (regardless of the outcome) is that she's worthy of the title she despises so much.]]
* ItIsPronouncedTroPAY: [[spoiler: Koko's name is how we see it in the modern times and pronouce it, her real name is pronouced Cao Cao or how ancient china prounced it as tsou tsou or alternatively Tsao Tsao.]]
* JapaneseChristian: [[spoiler:Kinji's not-so-dead older brother Kinichi/Kana is apparently one, as he/she quotes verses from Literature/TheBible regularly.]]
* {{Joshikousei}}: They wear sailor uniforms while wielding their guns and swords.
* JustPlaneWrong: JC Staff went to town trying to visualize the fictional 4-engined Boeing 737 variant (737-350) from the novels. First, it's modelled after a Boeing 737-600 (part of the Next-Gen series) with 2 extra engines tacked on (again, visualization). The cockpit and instrument layout is from one of the next-gen 737 variants (600/700/800/900). The modelled -600 has a range of only 3225 nautical miles, so it is impossible for it to make the direct 5183 nautical mile journey from Haneda to Heathrow. Almost none of the other variants can make it either, with ranges as low as 1540 nautical miles to just shy of 3500 nautical miles. Only one specific variant has the range, the 737-700ER, with a maximum range of 5510 nautical miles. The CG plane, even without the 2 extra engines is not modelled on this variant as its wings lacks the flared winglets found on all the other variants of the Next-Gen series, with the -600 being the odd one out. Before anyone tries to argue the fact that those winglets were introduced to this aircraft series AFTER they were originally debuted by Boeing (you can find photos of -700/-800/-900's with no winglets because those were taken before the winglets were available), keep in mind that the -700ER was introduced in 2006, 7 years after the introduction of the winglets, and thus all examples of this type come with them standard. And just for an extra bit of trivia, the plane has an All Nippon Airways identifier (ANA). ANA actually has a few 737-700[=ERs=] in its fleet.
** On a side note, the 737-350 was made to represent one of two different planes: The classic Boeing 707 (quad-engined, single-deck, narrow body), or the modern Airbus A340 (quad-engined, single-deck, wide body). The problem? Neither of Japan's 2 national airlines (Japan Airlines and the aforementioned All Nippon Airways), nor any of the country's other airlines, have owned and/or operated any variant of either aircraft.
* KnifeNut: Kinji has a butterfly knife.
** Riko dual-wields daggers.
** Reki carries with her a bayonet.
* KnowledgeBroker: Riko is one, but she demands payment in the form of {{H-games}} that would be inconvenient and difficult for a girl of her age to acquire.
* LampshadeHanging: Kinji throws this around alot in the novels, and funny enough most of them reference to anime/manga scenarios... now the series does have its own Anime and Manga.
* LethalChef: Aria; this comes up in volume 3 where Kinji and Aria infiltrate [[spoiler:Vlad's]] castle and pose as butler and a maid, respectively. Kinji cooks while Aria takes the credit.
* LikeCannotCutLike: Shirayuki and [[spoiler:Jeanne's]] {{Absurdly Sharp Blade}}s cancel each other out.
* LittleMissBadass: Aria.
* {{Lolicon}}: Kinji's classmates think he's one due to his association with the diminutive Aria.
* LossOfIdentity: What [[spoiler:Riko]] is dealing with for the first 3 volumes, but it gets solved with a little help.
* LovableSexManiac: Riko.
* LuminescentBlush: Aria has a lot already.
* MadBomber: [[spoiler:[=KoKo=], I-U's mechanical engineer.]]
* MagicKnight: Jeanne plays this role -- she wears modified plate mail, wields a zweihander, and can cast ice magic.
* MagicSkirt: Illustrated in Episode 1 of the anime, even before the opening theme started.
** Averted in episode 6, courtesy of an Aria somersault ([[PantyShot and they're white]]).
* MagneticHero: Even without Hysteria Mode, Kinji pretty much got the entire Assault Side (boys and girls alike) admiring him. That, in addition to [[ChickMagnet attracting]] [[ActionGirl a different sort of followers]].
* TheMagnificent: Kinji, being a {{Badass}} MagneticHero, has quite a lot of titles:
-->'''Aria:''' "[[HeIsNotMyBoyfriend Slave]]"
-->'''Shirayuki:''' "[[YamatoNadeshiko Husband]]" (She wants to be his VictoriousChildhoodFriend, after all)
-->'''Riko:''' "[[TheTease Playmate]]"
-->[[spoiler:'''Reki''']]''':''' "Husband" (On account of being both a good {{leader}} and fighter)
-->[[spoiler:'''Jeanne''']]''':''' "Ally" (With [[ShipTease subtle hints of a crush]])
-->'''Aya:''' "Best Customer"
-->'''Hina:''' "Master" (After all, he defeated her while under HSS back in Middle School)
-->'''Gouki:''' "[[BromanticFoil Best Buddy]]"
-->'''Ryou:''' "[[BashBrothers Best Buddy]]" (With shades of HoYay from observant girls' [=POVs=])
-->[[spoiler:'''Sherlock Holmes''']]''':''' "The man worthy of being my great-granddaughter's partner"
-->[[spoiler:'''Kinichi/Kana''']]''':''' "My little brother whom I've always loved"
* MaleGaze: All over the place. In particular, there are a ''lot'' of shots of Aria at just around [[ZettaiRyouiki the waistline]], though they're often preludes to her drawing the [[GunsAkimbo dual pistols]] holstered there.
* MaliciousMisnaming: [[spoiler:Riko really, ''[[BerserkButton really]]'' dislikes being called "Lupin the 4th".]]
* TheManBehindTheMan: The man behind all the crimes against Butei appears to be none other than [[spoiler:I-U's leader, Sherlock Holmes himself]].
* MarshmallowHell: Kinji gets into a lot of these (even from Aria's surprisingly soft flat chest). He accentuates the "Hell" in MarshmallowHell because it is an easy way to trigger his HSS.
* MasterOfDisguise: [[spoiler:Riko. She's so good, she can fool Kinji into thinking she's Aria.]]
* MeaningfulName: Aria is a solo song in an opera, showing Aria's loner side. This is {{Lampshaded}} by Aria herself.
** [[spoiler:Shirayuki's real name is Himiko, which can be translated into "Fire {{Miko}}". This is basically her power.]]
* {{Meido}}: Aria, Riko have worn the uniform. And now we Jean to the list.
* {{Miko}}: Shirayuki's typical outfit
** And her clan too, who are {{Badass}} Miko.
* MissConception: Aria thinks kissing leads to pregnancy -- [[spoiler:while trying to explain to Shirayuki why she and Kinji kissed]].
-->[[spoiler:'''Aria:''' "T-true, we did kiss... but don't worry! I didn't get pregnant!"]]
-->[[spoiler:*Awkward silence, then Shirayuki faints*]]
-->[[spoiler:'''Kinji:''' "What?!"]]
-->[[spoiler:'''Aria:''' "Daddy said I would get pregnant if I kissed!"]]
-->[[spoiler:'''Kinji:''' "Obviously not!"]]
* MistakenMessage: Jeanne sends Kinji a letter with offical seal and such. Gouki and Ryou think it's a love letter. [[spoiler: Turns out its a challenge.]]
* MsFanservice: Riko.
* MysteriousPast: Reki is so mysterious, no one even knows her last name.
* NamesToRunAwayFromReallyFast: Jeanne d'Arc the 30th -- [[spoiler:The Diamond Dust Witch, AKA Durandal]].
* NeverASelfMadeWoman: A very dark take on this trope. [[spoiler:Riko resents the world for not acknowledging her as an individual, but as a continuation of [[Literature/ArseneLupin Arsène Lupin's]] legacy. This drives her to become the Butei Killer in order to accomplish what Lupin never can: slay a Holmes and finally break free of his shadow.]]
* NewPowersAsThePlotDemands: Seen in Kinji's fight against [[spoiler:Kana and Holmes]] where new versions of HSS conveniently appear.
** Kinji also seems to find a new way of blocking/dodging bullets when it comes down to the wire, from his first time [[spoiler:using his knife]] to [[spoiler:catching it in his teeth]]. Most of the more useful techniques he keeps around.
* NiceJobBreakingItHero: [[spoiler:With Kinji and Aria defeating Sherlock Holmes and dissolving I-U, its remnants are now free to follow their plans, and each member knows a bit of each field akin to Butei's. In other words: the duo just opened a Pandora's Box of supervillains ready to do whatever they want and with the skills to back it up. Perhaps Kinji and Aria should be grateful for having Shirayuki, Reki, Riko, Jeanne, Hina, Aya, Gouki, Ryou, Misaki and the rest of Butei on their side, otherwise they'd be dead by now.]]
* TheNicknamer: Riko. She has a tendency to give a nickname to her friends.
** Kinji: Ki-kun
** Aria: Arian (sometimes)
** Shirayuki: Yuki-chan
** Reki: Rekyu
** Aya: Ayaya
** Hina: Fuu
** Heck, she even calls herself Rikorin.
* NobleDemon: I-U has shades of this. Some (especially [[spoiler:Sherlock Holmes]]) are this; others... are just plain demons (and in some cases, not just figuratively).
* NotCheatingUnlessYouGetCaught: Kinji has to play a soccer game to finish his required credits... ItsALongStory, and since his team -- Aria, Shirayuki, Hina, Gouki, Ryou, [[spoiler:Riko and Jeanne]] -- never played well before, they get [[CurbStompBattle manhandled]], until Kinji goes into HSS and tells them in the locker room to do this trope. That's right -- Butei use their elite skills (and magic powers) to win a soccer game.
* NotHimself: Kinji in Hysteria mode.
** [[spoiler:Then there's "Dark Riko", where she has a strange gaze from her eyes, she uses rough language, and she calls Aria "Holmes".]]
* NotSoDifferent: Aria and Riko -- they're both short, both are Quadra, both have GirlishPigtails, and both are fourth-generation descendants of famous men... [[spoiler:Sherlock Holmes and Arsene Lupin]], respectively.
* NotWhatItLooksLike: When Kinji gets into a... [[AccidentalPervert complicated position]] with a girl or too close to one acutally.
* ObfuscatingStupidity: Riko.
* OhCrap: Plenty to go around...
** When new villains are introduced.
** When [[ChickMagnet Kinji meets a new girl who takes a liking to him]].
** When something goes wrong (above two examples, plus the occasional terror plot).
** When the new opponent isn't human, is a special psycho genius, or is simply killing for fun.
** When two girls who like Kinji meet each other.
** When any girl meets [[{{Yandere}} Shirayuki]] and tell her they're in love with Kinji.
** When you get a surprised ambush attack.
** Being Kinji in all of the above.
* {{Ojou}}: Aria, Shirayuki,[[spoiler: Reki, Jeanne, Riko]] are all some to an extent (they have either a long family lineage, or are descendants of nobles).
* OlderThanTheyLook: Both Aria and Riko.
** Tamano a minor character introduced later on [[spoiler: 700-800, knows Kinji's ancestor, uses ye old language, as well knows Shirayuki and her ancestor]], but looks like a little girl.
** The landlady of hot springs the gang visits at the OVA -- herself [[RetiredBadass a retired Butei]] and Tsuzuri-sensei's former partner -- looks way too young to be in her sixties (and is even voiced by Creator/YuiHorie).
* OnTheNextEpisodeOfCatchPhrase: "I'll blow a hole through you, if you don't tune in next week."
* {{Otaku}}: Gouki is a vehicle nut, which helps Kinji and Aria a lot.
* OurVampiresAreDifferent: [[spoiler:Vlad Dracula, an actual vampire who has acquired the ability to mimic the form of humans. He is able to mimic special qualities of humans by sucking their blood, and a HealingFactor from his "Demon Entrails". His daughter Hilda has the same abilities.]]
* OverprotectiveDad: Aria's father is very likely to be one, as he did tell his daughter that [[MissConception kissing leads to pregnancy]].
* PassingTheTorch: As of Volume 5 Aria has inherited the title of "Scarlet Ammo" from [[spoiler:Sherlock Holmes]] after she and Kinji defeat him.
* PatientChildhoodLoveInterest: Shirayuki.
* PlayingWithFire: [[spoiler:Shirayuki's power. It helps in the fight against AnIcePerson, Jeanne d'Arc the 30th.]]
* POVBoyPosterGirl
* PowerLevels: Butei have a rank level -- for example, Aria is a top-dog Rank S, while Kinji is a bottom-of-the-barrel Rank E (in normal mode, at least -- [[AlmightyJanitor under HSS, however, he has the skills of a Rank S]] [[UpToEleven and possibly even higher than that]].
* PrehensileHair: [[spoiler:Riko]] is able to manipulate her incredibly long ponytails with the agility of actual limbs, and use them to wield knives in combat.
* RapunzelHair: Aria's hair almost reaches her ankles while in ''ponytails''.
** Shirayuki has comes down to her hips.
*** Same for Riko, [[spoiler:who can use hers as extra knife-weilding arms in combat]]
* RunningGag: Everytime Kinji gets another girl to join him, rumors start flying around Butei High on how this happened. Then again, Kinji [[MagneticHero is like]] [[ChickMagnet a magnet]]...
** There's also the constant destruction his room suffers whenever girls with a romantic interest in him fight each other, such as that between Aria and Shirayuki, as well as between [[spoiler:Shirayuki and Riko]].
* SailorFuku
* SayMyName: Riko asks this of Kinji, proving to her that she's no longer just "The Fourth".
* [[spoiler:SameSexTriplets: The Kokos]]
* ScarsAreForever: The scar on Aria's forehead will always remind her of how close that bus incident was.
* ScienceVersusMagic: Averted -- Butei High trains students from both technological and supernatural disciplines, and even encourages team-ups between members of either discipline.
* SecretLegacy: The Touyamas' HSS have triggers that turn them into ass-kicking machines. The ''basic'' trigger for ''all'' of them[[note]]At least until they find a way around this[[/note]] is [[DeusSexMachina sexual arousal]] -- Kinji considers this a curse.
* SheCleansUpNicely: Reki -- [[http://www.baka-tsuki.org/project/index.php?title=File:Aria06_031.jpg normally]], and [[http://www.baka-tsuki.org/project/index.php?title=File:Aria06_177.jpg with new clothing, makeup, and straightened hair]].
* SheIsNotMyGirlfriend[=/=]HeIsNotMyBoyfriend: Kinji and Aria frequently invoke these.
* ShockAndAwe: Turns out Hilda can shoot out electricity at her enemies, although the drawback is she doesn't generate her own she just manipulates it like a transformer.
* ShotToTheHeart: [[spoiler:Kinji uses this to resuscitate Aria after she loses her duel with Riko.]]
* ShoutOut: One of the LightNovel chapter titles is [[{{IOSYS}} "You Stole The Precious Thing"]].
** The final shot of the opening credits, in which Aria shoots out a rose, is reminiscent of Saeba Ryo doing the same in the second opening of ''CityHunter''.
** Riko's name Shouts out to [[spoiler:[[Franchise/LupinIII Fujiko Mine and Arsene Lupin the 3rd]], suggesting they eventually marry. Also, her (unwanted) title "Lupin the 4th" is a nod to said show depicting the legendary gentleman thief's grandson.]]
** Aria gets mistaken for [[{{Vocaloid}} Miku]] at one point in the light novels.
** [[spoiler:When Reki swears to stay by Kinji's side per The Wind's orders he [[Franchise/{{Terminator}} raise a leg, in reference to a scene from T2 where John orders the bot to raise his left leg.]]]]
** [[spoiler: Sherlock Holmes']] "Study in Scarlet" of the titular ''Hidan'', or "Scarlet Ammo", is a clear reference to the title of the first Sherlock Holmes novel ''A Study in Scarlet''.
** [[spoiler:In Volume 7 Kinji's official team is named Team Baskerville which is a reference to a ''Franchise/SherlockHolmes'' novel ''The Hound Of Baskerville''.]]
** The whole OVA episode is a ShoutOut to ''Film/TheGrudge''.
** [[Film/{{Speed}} The bus has a bomb that explodes if it slows down.]]
* ShrinkingViolet: Misaki Nakasorachi is a stuttering ditz. A definite cutie, though this keeps her stuck as a B-Rank despite being, ironically enough, an excellent MissionControl.
* SmallGirlBigGun: Reki and her big-ass sniper rifle.
* SomethingElseAlsoRises: Kinji and his Hysteria Mode.
* SpellMyNameWithAnS: Though a minor case, there's some debate between Kinji's last name -- "Touyama" or "Tohyama".
** Then there's a case with the primary antagonist organization for the first few volumes, whose run-ins with this trope are compounded by pronunciation issues. Initially, this organization was called "[=EU=]", straight from the pronunciation. A few volumes down the road and it's revealed what the name actually means. The name is composed of the letters that the Imperial Japanese Navy and Kriegsmarine used to designate their submarines, respectively. The problem? The IJN used the letter I to designate their submarines, and the English fanbase mistook it as an E because the Japanese I is pronounced the same as the English E.
* SpiritualSuccessor: Tokyo Butei High School, [[spoiler:to Literature/SherlockHolmes's "armed detective" philosophy. No wonder they were the target of the Butei Killer.]]
* VideoGame/SuperHeroineChronicle: Aria, Hotogi, Jeanne, Reki, and Riko (as a SecretCharacter) join in the game.
* SupremeChef: Shirayuki can really cook. And not just your average meals we're talking sashimi, chinese, and turning left overs in the best late night meals. And she's supposed to be the Ojou.
* SuspiciouslySpecificDenial: Kinji makes a comment about his "Dress Scan" ability in the third volume.
--> '''Kinji:''' "By the way, "Dress Scan" is a skill I learned in Inquesta. It is a method to analyze and memorize a person's characteristics in order for investigation to proceed smoothly. There's definitely no ulterior intention here or anything like that. I'm telling the truth."
** To a lesser extent, everytime Aria calls Kinji her slave when someone tries to take him away from her.
* SuperReflexes: Another of Kinji's HSS abilities. [[spoiler:He can [[BareHandedBladeBlock stop Jeanne's blade with two fingers]], slice Riko's bullet in half mid-flight, and dodge a 7.62mm rifle round at point blank.]]
* SweetPollyOliver: [[spoiler:Elle Watson]]
* TakeThat: Riko, being a GenreSavvy {{H-game}} aficionado, immediately dumps away sequels and later versions of some games Kinji bought for her in exchange for information about Aria, proclaiming them as insults to the originals.
* TheTease: Riko.
* TheTeam:As the series progresses, Kinji and Aria diversify from a two-man partnership to a strike team-caliber group:
** Kinji Touyama ([[TheLeader Team Leader]] / [[JackOfAllStats All-Around Combat]] / [[spoiler:[[DualWielding Quadra Combat]]]])
** Aria H. Kanzaki ([[ActionGirl Tactical Assault]] / [[NumberTwo Lieutenant]] / [[DualWielding Quadra Combat]])
** Shirayuki Hotogi ([[MultiMeleeMaster Melee Combat]] / [[spoiler:[[PlayingWithFire Fire-Elemental Combat]]]])
** Reki ([[ColdSniper Long-Range Support]])
** Hina Fuuma ([[HighlyVisibleNinja Reconnaissance/Distraction]])
** Riko Mine ([[KnowledgeBroker Information]] / [[spoiler:[[MataHari Espionage]]]] / [[spoiler:[[DualWielding Quadra Combat]]]])
** [[spoiler:Jeanne d'Arc the 30th ([[TheStrategist Tactical Planning]] / [[AnIcePerson Ice-Elemental Combat]])]]
** [[spoiler:Elle Watson ([[TheMedic Medical Support]])]]
** Gouki Mutou ([[AcePilot Transportation]])
** Ryou Shiranui ([[ReverseMole Infiltration]])
** Misaki Nakasorachi ([[MissionControl Field Coordinator]])
* TerribleArtist: Jeanne is good at so much stuff, but she's ''terrible'' at drawing.
* ThemeNaming: Kinji and his [[spoiler:supposedly-dead]] older brother Kinichi have this, with Kinichi being "Kin 1" and Kinji being "Kin 2". [[spoiler:That's very common in some societies (Romans, for example), and still used sometimes in Japan. But there's more, since 'kin' means 'gold' and their father was a very famous top-elite butei, so his descedants were called "the G-bloodline" (from 'gold') and given tags, being Kin'ichi G-1 and Kinji G-2; they even made two test-tube kids from his DNA and that of others top-class butei, a boy and a girl, originally named respectively G-3 and G-4; they later received the names of Kizou (gold three) and Kaname (gold woman). Note that Kin'ichi's female alias, Kana, comes from removing the 1 from his name (meaning simply 'gold').]]
** The Hotogi sisters' names end with "-yuki" [[note]]Snow[[/note]], and are all names of kind of snow.
* ThirdPersonPerson: Riko deliberately invokes her "cutesy" personality by frequently referring to herself in childish third-person.
* ThisMeansWar: The LightNovel's first seven volumes introduce a few factions. [[spoiler:At the end of volume 7 Kinji and the audience gets to meet ''all'' of them...]]
* ThouShaltNotKill: Codified in the Butei Charter's Article 9 -- "Regardless of the situation, a Butei cannot kill."
* ThoseTwoGuys: Gouki and Ryou are practically the only guys who interact with Kinji onscreen. They also pop on and off in both the novel, manga and anime.
* TheThreeFacesOfEve: Aria is the child ([[OlderThanTheyLook short]], [[HairTriggerTemper irritable]] and [[{{Tsundere}} romantically awkward]]), Shirayuki is the wife ([[TheIngenue sweet]] and [[YamatoNadeshiko demure]]), and Riko is the seductress ([[MsFanservice sexy]] and [[LovableSexManiac proud of it]]).
* ThroughHisStomach: Shirayuki tries this with Kinji.
* TitleDrop: First invoked by [[spoiler:Kana]] in Volume 4 of the light novels.
* TrademarkFavoriteFood: Aria definitely loves (and is absolutely ''adorable'' when eating) her peach buns.
** Riko and her [[http://farm4.static.flickr.com/3146/2575878547_37701603cb.jpg strawberry au lait]]
** Haimaki and [[http://www.apfrozen.com/Other_Products/Fish_Sausage.jpg fish sausages]]
** Reki and her energy bars
* TrueCompanions: Butei are expected to help each other out, whatever the situation. It is even encoded as Butei Charter Article 1 -- "Never leave your comrades behind"/ "Trust in your friends and help when they need it".
* TurnOutLikeHisFather: Kinji does not want to become this, but circumstances might say otherwise. An example of such is his upgrade to carrying a Desert Eagle Magnum, a .50 handgun his father used during his days as "armed prosecutor".
* TwoAliasesOneCharacter: In the LightNovel [[spoiler:GenghisKhan and Yoshitsune no Minamoto are one and the same]].
* UglyGuysHotDaughter: [[spoiler:Vlad Dracula's daughter, [[http://www.baka-tsuki.org/project/index.php?title=File:Aria09_003-005.jpg Hilda]].]]
* UngratefulBastard: [[spoiler:Kinichi was (supposedly) killed saving average citizens from a sinking ship. However, instead of treating him like the hero he was, because they didn't want to be sued, the company that owned the ship said the sinking was mainly Kinichi's fault, and that he was a horrible Butei, forcing Kinji to mull leaving Butei; fortunately for him Aria's presence changed his mind.]]
* {{Unobtanium}}: Irokane, a rare magical metal everyone is fighting over.
* UnstoppableRage: [[spoiler:In Volume 4, Patra shoots Kinji in the head. Although he manages to use HSS to catch the bullet between his teeth, the shock of catching it knocks him unconscious, blood oozing from his head. Aria, thinking he had died, loses herself to shock, grief and hatred, awakening her Hidan Mode and shooting Patra with the Scarlet Bullet in revenge.]]
* UseYourHead: Kinji's secret skill.
* VictoriasSecretCompartment: Riko, being the adorable tease that she is, gives Kinji her gaming-coupon after opening her shirt and ''extracting said ticket from between her firm and ample breasts.''
* VictoriousChildhoodFriend: Shirayuki's ultimate goal with Kinji -- graduate together with Kinji, marry him and have ''7-8 children, all of whom would look like "Kin-chan-sama"''.
* WackyMarriageProposal: [[spoiler:Reki orders Kinji to marry her with a gun pointed at him, on the roof of the school.]]
** In Volume 10 we get another one..[[spoiler: Long story short Kinji has a genetic cloned girl who is more or less his sister, who is yandere for him. Trying to get rid of her he comes up with a ploy to get Shirayuki to act as his sister. How does he doe this?? Bring a bouquet of roses, asks Shirayuki Hotogi to become Shirayuki Touyama, and does this on one knee[[note]] the knee thing was a battle injury not yet healed[[/note]]. Shirayuki always wanted to marry Kinji.]] Someone [[PassThePopCorn get the popcorn.]]
* WakeUpGoToSchoolSaveTheWorld: Not exactly saving the world, but solving criminal cases and everything else fits. And if you're a ''really'' lucky Butei all these might happen after school, not ''on'' your way to school (just ask Kinji at the beginning of the series, or a bus full of Butei students during episode 3 and mid-volume 1 of the novels).
* TheWatson: Aria the Holmes initially chooses Kinji to be her Watson. [[spoiler:Later on we're introduced to Elle, John Watson's ''great-granddaughter'' who was [[LesYay meant to be Aria's fiancé]].]]
* YamatoNadeshiko: Shirayuki. This is {{Lampshaded}} by Kinji in the novels.
* {{Yandere}}: Shirayuki -- early in episode 2 she displays DullEyesOfUnhappiness when she suspected Kinji is with someone else. Upon discovering that [[PrettyFreeloaders Aria is freeloading with Kinji]], she decides to [[MurderTheHypotenuse "exorcise" her]] twice (first, by cutting her down with her katana; second, by [[StealthPun blowing hundreds of holes through her]] with an [=M60=]). Even when she was forced to take Aria as a bodyguard, she still shows contempt for the diminutive girl.
** And despite the fact they became friends, she'll still chase her down accusing [[GenreSavvy her of taking the lead.]]
* YouGottaHaveBlueHair: Reki's hair is green, and Aria's is bright pink. [[spoiler:It is eventually revealed that their unnatural hair colors is a side-effect of contact with Irokane -- Reki had long-term exposure to it as a child; Aria has one embedded in her body in the form of the titular Scarlet Bullet.]]
* ZettaiRyouiki: Aria, combining this with her [[GirlishPigtails twin tails]] and [[{{Tsundere}} attitude]] (as well as [[RieKugimiya the voice]]), makes a '''''Grade S'''''. Possibly to {{Lampshade}} this, Aria's rank in Butei High? Rank S.
----