!!Character-related:

* BestKnownForTheFanservice: In retrospect, it probably wasn't the most brilliant idea to make the episode where [[ShamelessFanserviceGirl November 11 lounges around naked]] be [[spoiler:the same one where he dies]] -- otherwise, you end up with [[spoiler:fan memorials]] that [[http://community.livejournal.com/darker_than/115727.html#cutid1 get a little mixed up]].
* BigLippedAlligatorMoment: Every time Suou summons her sniper rifle, since both the power and the over-the-top MagicalGirl summoning sequence are totally at odds with the series as a whole.
* CrackPairing: Hei/Hazuki. [[spoiler:Hilariously enough, the only shipping pair to actually get any action. [[IntimateHealing That remuneration]] sure is awkward, huh?]]
* CrazyAwesome: Playing chicken with an ''airplane''. [[spoiler: Hei. Genma. Episode 9.]]
* CompleteMonster:
** ''Gaiden'' OVA: Claude[[note]]real name Shichi/Xi-Qi[[/note]] is the BigBad who stands out from the normally amoral super-powered beings known as Contractors by his outright [[FantasticRacism hatred of normal humans]]. Claude torments his enemies before killing them by using his [[MasterOfDisguise powers]] to [[ManipulativeBastard masquerade as one of their loved ones]]. His motivation is to turn the heroic Yin into the PersonOfMassDestruction known as Izanami. He is callous enough to turn her into Izanami when she is in a base of Contractors, knowing that this would mean that her powers would kill everyone on the base. Although he claims that his goal is to create a world where Contractors rule over humans, his cruelty and constant chaotic choices show Claude is nothing more than [[TheSociopath a sociopath]] who is willing to hurt anyone just to keep himself entertained.
** ''Flower of Darkness'' manga:
*** [[BigBad Harvest]] serves as an EvilCounterpart to [[TheProtagonist Hei]]. While Hei embraces his humanity, Harvest considers humans to be weak and pathetic. Harvest possesses the titular "[[GreenThumb Flower of Darkness]]" which can be given to a person to grant them powers. He chooses to [[ManipulativeBastard make those powers dependent]] upon one condition: that the person kills his or her best friend. To make things more interesting for himself, he also gives the best friend a Flower. Harvest is angry when he is told that Hei is morally superior to him. In reaction, and to [[ItsAllAboutMe stroke his ego]], he distributes Flowers to all of humanity in an effort to prove to himself that there is no such thing as morality. However, when his plans are foiled, Harvest reveals himself to be a [[EvilIsPetty petty monster]] by trying to destroy the planet out of sheer petulance and frustration.
*** The manga also reminds readers that sometimes HumansAreTheRealMonsters. The girls' academy volleyball coach, Daisuke Mioka, is a [[BitchInSheepsClothing handsome, charming man]] who takes advantage of his young students by seducing them and secretly making videos of the sex to sell on the internet. When one student finds out, Daisuke tries to win back her trust by having a group of his friends rape her, before sweeping in to act as the hero who saves her. He promises his friends that he will be "a little late" so that they can begin violating her before he arrives. Upon being confronted with what he's done, Daisuke says that women want to be have sex with him and [[NeverMyFault they are the ones to blame]].
* CreatorsPet:
** This seems to be a common view of Suou; some fans even think that her [[SpotlightStealingSquad spotlight-stealing]] is ''entirely'' responsible for [[TheyWastedAPerfectlyGoodPlot ruining an otherwise decent plot]].
** Of course, Suou also has her fans, who thought that she gave the season a fresh approach which it sorely needed, since season 1 all over again (just substituting Amber with [[spoiler: Yin/Izanami]] would have stagnated the plot).
** And then you have the people who think that second season ''did'' stagnate the plot, and that Suou's spotlight stealing made it ''even worse''.
* EnsembleDarkhorse:
** November 11 was [[GermansLoveDavidHasselhoff quite popular with North American fans]], at least partly due to his [[Film/JamesBond classy bearing]] and sense of humour.
** Goran, who in his less than half-episode of screentime managed to acquire a veritable real-life {{Instant Fan|Club}}dom.
* FanPreferredCouple: Hei/Yin. The art for the series makes them look like an OfficialCouple but the series portrays the exact nature of their [[ImpliedLoveInterest relationship as ambiguous]]. Yin developed feelings for Hei in the first season, the manga provided them with more ShipTease, and the OVA ramped this UpToEleven. However, they both have trouble expressing their emotions properly and Hei is a MasterOfTheMixedMessage so his protectiveness towards Yin could be his BigBrotherInstinct acting out. The official website states that Hei "feels strongly" about Yin and various staff members for the anime think of it as romance. There has been no official statement made on it though.
* FoeYay: Misaki and Hei, ever so much. In the second season, Mina jokes that she's saving her virginity for him.
* GermansLoveDavidHasselhoff: The North American fanbase loves November 11.
* HarsherInHindsight: For Troy Baker, who said in a Funimation commentary that at the time he played November 11, he had recently chose to quit smoking. However he also took it in stride and joked about it.
* HoYay:
** Shichi enjoys [[MasterOfIllusion pretending to be a woman]] who was in love with Hei a little too much.
** Episodes 11 and 12. Hei and Nick became close ''very'' quickly, spent a whole night watching the stars together (and made plans to go watch them again afterward), and Hei [[spoiler:looked really sad and heartbroken after Nick "betrayed" him]].
** Female example: Buckets aimed at Misaki. She doesn't reciprocate much, though. In all fairness, pretty much every character has at least a little attraction for her, not just the women.
* IronWoobie: Havoc.
--> '''Havoc''': Promise me one thing, though. If... If I revert back to [[EatsBabies my former self]], kill me right away.
* JerkassWoobie: [[TheHandler Huang]] [[spoiler:was a cop until his best friend was horribly killed... by the woman Huang loved, who he discovered had just been using him to get to said best friend. He was left with no choice but to join the Syndicate or have his memories wiped, which he feels would be like killing his friend all over again]]. This resulted in Huang being a [[NobleBigot bigotted]] {{jerkass}}.
* LauncherOfAThousandShips: Poor Hei gets shipped with ''everyone.''
* {{Magnificent B|astard}}itch: Amber. No surprise considering her powers to [[spoiler: travel through time]] gives her the upper hand to manipulate people and events.
* MemeticBadass: Hei, definitely.
* {{Moe}}:
** Yin. Seems to come with the territory when you're an EmotionlessGirl.
** Amber, played up deliberately.
** Meena
* MoralEventHorizon:
** Daisuke posting web porn of his conquests whilst they remain ignorant of it. [[ArsonMurderAndJaywalking With badly blocked out faces.]] [[spoiler: Then hiring a gang to rape Azusa '''AND''' Kyouko, with Kyouko as an unwitting accomplice, just so he can "rescue Azusa" or so she can't tell on him.]]
** [[spoiler: The callous and horrible way in which Tanya kills her other best friend/crush Nika.]]
** Claude's massacre of a group of Contractors who just wanted to live in peace. Particularly since given [[MasterOfIllusion his powers]], he had [[ForTheEvulz no real reason to do it]].
** If you [[LaughablyEvil somehow]] still harbored any sympathy for Genma, the throwaway comment in the last episode that [[spoiler:he was the one who killed Youko and the implications of having raped her prior or even worse; after her death]] pushes him straight into total bastard territory.
* OneSceneWonder: Goran was on screen for maybe five minutes.
* RetroactiveRecognition: November 11's dub voice is Creator/TroyBaker, better known these days as [[VideoGame/TheLastOfUs Joel]] or [[VideoGame/FarCry4 Pagan Min]].
* RootingForTheEmpire: Compared to the Syndicate and Pandora figures, Amber's far more likable and charismatic.
* TheScrappy: Norio, for being a {{w|angst}}hiny, semi-delusional and just generally annoying paedophile stalker PlayedForLaughs and [[StalkingIsLove (attempted) sympathy]] who hits the wrong side of WhatMeasureIsANonBadass ''hard''. This is even lampshaded by the voice actors in the Darker than Black radio.
* StoicWoobie: It sucks to be Yin. Or Hei.
* TooCoolToLive:
** [[spoiler:August 7. Or so we thought.]]
** [[spoiler: Also November 11 and Huang.]]
* ToyShip: Suou/[[spoiler:July,]] who's [[EmotionlessGirl somehow]] fond of her.
* WhatAnIdiot: Goran, the Contractor so incompetent he was killed by rain drops and his own inability to prepare for any contingency whatsoever.
* TheWoobie:
** Havoc. Not bad for a reviled mass murderer who literally [[EatsBabies drank the blood of children]].
** In season 2, Genma invokes the trope in hopes that it can apply to him ("Hey, having an unfortunate past can score me some {{Moe}} points!"). [[note]]That'd probably work better if Hei didn't have the DarkAndTroubledPast thing cornered and Amber, Suo, and Yin weren't covering the {{moe}}.[[/note]]

!! Seasons 1 and 2
* SugarWiki/AwesomeMusic:
** Well, it's by Music/YokoKanno, so what do you expect? "GO Dark" and "[[AutobotsRockOut Deadly Work]]" in particular. The first OP is also impressive, even given the NarmCharm and MemeticMutation.
** The second OP isn't bad, either - it just has the misfortune of [[ReplacementScrappy turning up after]] ''[[SugarWiki/AwesomeMusic Howling]]''.
* DarknessInducedAudienceApathy: Go figure. The show's love of the DevelopingDoomedCharacters trope makes it hard to get attached to anyone who shows signs of character depth.
* FanDislikedExplanation: The complete [[AvertedTrope lack of explanation]] for the [[EldritchLocation Gates]], AlienSky, and the like generally works well enough that resolving exactly what's going on would probably be a bit of a letdown.
* FanficFuel: Several of them. Some include...
** How the Gates appear in the world.
** What did the characters in the series did before, during and after the Gates show up and also what they did prior to the start of the show.
** Some write their own fics to not take Gemini of the Meteor into account.
** [[HeroOfAnotherStory Others include Contractors/non-Contractors who try to take on the Syndicate and other like-minded factions.]] While some work together with Hei/Yin and Misaki.
* FanonDiscontinuity: Some people ignore the second season entirely.
* SugarWiki/FunnyMoments:
** [[DarkerAndEdgier Not much]], but Huang [[FantasticRacism slighting]] Mao into near-hissing only to be [[InsultBackfire verbally drowned in vitriol]] by [[DeadpanSnarker absolutely calm]] Hei might count. And there's the PrivateDefective team... "I'll totally sue you."
** Kiko's very existence serves as a comedy relief element for the series. Other than Mao's [[SweatDrop nervous sweat-beads]], she's the only other character who's frequently prone to over-exaggerated anime emotions, such as WingdingEyes whenever an opportunity to make money comes around, and ExpressiveHair.
*** One great Kiko moment was when she and a friend were complaining about AdaptationDecay of some unnamed series.
--->"I can't let that writer live!" * Pulls out pen with an [[MundaneMadeAwesome over-the-top]] sword sound effect* "[[Manga/DeathNote I'm writing his name in my notebook!]]"
** And, after Mao [[spoiler:wakes up in Amber's headquarters]], he gives a long, dramatic monologue about how contractors always do the logical thing. When he get caught by the others for trying to non-chalantly walk out of the room, he tries to logically respond with a [[spoiler:"Meow"]].
** Then there's the time when Hei was infiltrating a restaurant and a violent, drunk customer decided he had a problem with the waiter. Result: Huge tough guy trying to beat up a cute, skinny little waiter who [[CoverBlowingSuperpower isn't doing that great of a job of hiding his epic ninja skills]].
** The time when a couple of [[KnockingOnHeathensDoor door-to-door missionaries]] went after Hei. "Um... I just want to put away my groceries..."
*** '''"NI HAO!!!"''' (Cut from the dub)
** "[[AlienSky The stars are pretty.]]"
** Most of the {{O|riginalVideoAnimation}}VA. It's basically an [[BonusMaterial omake]] parodying the main series, particularly mocking Hei's ChickMagnet status and the fact that a WhiteMaskOfDoom and [[BadassLongcoat a change of clothes]] really shouldn't be ''that'' effective of a disguise. Highlights include slightly loopy {{fangirl}} Mayu crushing on him due to his "sexy collarbone" and writing him into her yaoi fanfic (which ''[[CovertPervert Yin]]'' reads), and what is possibly the absolute silliest ResetButton in the history of fiction.
* SugarWiki/HeartwarmingMoments: A lot of the last episode of the first season, [[GainaxEnding assuming you can make any sense of it]]. And then there's episode 14... [[spoiler:"Kirsi..." "No. Yin."]]
* LessDisturbingInContext: Just ''try'' to explain that the show isn't {{Gorn}} to someone who walks in on Havoc's "[[EatsBabies blood of children]]" line.
* MemeticMutation:
** Post the first line of the first OpeningTheme on /a/ and see what happens.
** If [=YouTube=] is any indication, "UNTZ UNTZ UNTZ" has become one in reference to Gemini's trance-filled OST.
*** So it's become the musical equivalent of [=Candleja=]''UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ''
*** Yeah, that's exactly i-UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ UNTZ
** [[FanNickname Chinese Electric Batman!]]
** Veteran's Day (11/11) has been commandeered in honor of November 11. [[http://omaemo.dasaku.net/wp-content/uploads/2007/11/november-11-tribute.jpg Naked pictures]] [[BestKnownForTheFanservice are inevitably involved.]]
** [[PerverseSexualLust I wish Hei'd rape me. ;_;]]
** Hei will die. But his soul will choose to go back in time, the time when he was happiest, and he will be at season 1 first episode. Suou who loves Hei wants to be with him too and wants to be in a time when Hei'd love her, but since he already loves Yin she'll go back in time before Hei is born, and become his mother.[[note]]This copypasta jokingly places Hei, Suou, and Yin in the roles of three primary characters in the ''VideoGame/ShadowHearts'' series. Said explanation is a note because it's also the [[spoiler: ending to the ''second game'']].[[/note]]
* SugarWiki/MomentOfAwesome:
** See TakingYouWithMe and DyingMomentOfAwesome. Since Hei lives and breathes pure awesome, though, it can be hard to pick out specifics.
** He pulls some seriously awesome stuff in the last episode, though, and there's some more clear-cut moments in the second season.
* NarmCharm: The GratuitousEnglish lines at the beginning of the first opening should by all rights sound stupid. Instead, they're ''awesome'', in an over-the-top, MemeticMutation kind of way.
* NightmareFuel:
** Mai's pyrokinesis burning her friend and her dad to death. Followed by the two police officers being sliced to pieces.
** Nika and cockroaches - just... ''gah!''
** Izanami's awakening.
* {{Sequelitis}} / SeasonalRot:
** A solid number of the fanbase are very and vocally dissatisfied with the new tone.
** Though many were somewhat mollified towards the end, when the NoYay was turned down and [[HesBack Hei stopped acting so obnoxious]].
* SurprisinglyImprovedSequel: To the second season, for people who liked it.
* TearJerker:
** More than you'd expect. Episode 14 is a big one.
** The end of Episode 4, too.
** Hei's NotSoStoic moment in the Gaiden. The worst part is that [[spoiler:if you've watched the second season, you know she ''does''.]]
** Yin's nightmare. She keeps quietly saying Hei's name... which you quickly realize is the EmotionlessGirl equivalent of screaming for help.
** Despite being a major MindScrew, [[spoiler: what happens to Nick in episode 12 is also oddly emotional, especially when you remember what his dream was.]]
* TheyWastedAPerfectlyGoodPlot: Those who do agree are generally the same people who think that Suou [[SpotlightStealingSquad gets way too much screen-time]] and therefore like to call her "Mary-Suou".
* {{Woolseyism}}: The first two episodes make more sense and fit the tone of the rest of the series quite a bit better in the dub; in particular, they changed Jean's completely-inconsistent-with-everything-else comments about "installing a personality" to something like "Contractors have feelings too" and replaced Mao's inexplicable line about Hei's coat only being bulletproof when ''he'' wears it with an excellent DeadpanSnarker moment along the lines of "Hei doesn't just wear that coat as a fashion statement."