* AngstWhatAngst: Most cyborgs have their memories or their pre-Agency lives erased in order to remove the pain of past traumas (or make them easier to control, if you're cynical). Rico is unique in that she has full recollection of her time before she was given over to the Agency - which was not in itself a happy experience, with years crippled by birth defects and beset by quarreling parents - and is not at all troubled by years wasted in a hospital bed or being possessed by the Agency.
* CrowningMusicOfAwesome: The opening theme to season one introduced many viewers to Scottish band The Delgados.
** The ending credits music, ''Apres un Reve'' by Gabriel Fauré.
* EnsembleDarkhorse: While Henrietta is ostensibly the focus character and the Henrietta-Guiseppe-Jean-[=MemoryOfEnrica=] plotline is the main narrative thrust of the work, fans at large have noticed over the years that the emotional impact, narrative depth, and [[CrowningMomentOfAwesome generalized awesomeness]] of the series tends to get turned up to 11 any time Triela is involved in a scene or plotline.
** Worth noting, Triela is the first of the girls we see "on the job".
** In season 2 of the {{anime}}, Triela is [[BreakoutCharacter promoted to the lead]].
* GermansLoveDavidHasselhoff: In America, the first season was a modest success on DVD. In Japan, it was sold as a ''pack-in bonus for the licensed video game''.
* HarsherInHindsight: The earlier deaths of [[spoiler:Elsa and Lauro]] helped foreshadow the deaths of [[spoiler:Henrietta and Jose]].
* MoralEventHorizon: Averted. When Pinocchio decides to kill Aurora for walking in on his affairs once too many (and given that he's falling in with some pretty shady people, he had every right to be concerned), [[spoiler:Flanca orders him to not pull the trigger, thus preventing Pino from actually crossing the MEH.]]
** Played straight by Ski Mask Guy in chapter 83, who crosses it ''just by showing up in front of Henrietta''. The poor girl had lost her family to a couple of guys in ski masks, and just his appearance brought back those troubling memories and [[spoiler:indirectly led to both her and Jose's deaths.]]
** Dante was already established as a very bad man, but his personal MEH was [[spoiler:orchestrating Sophie's death by car bomb, which also claimed everyone in the Croce family that wasn't named Jose or Jean]].
* {{Narm}}: From ''Il Teatrino'':
-->'''Triela''': I'M CYBERNETIC!!! And I was beaten by ''HUMAN HANDS''!!!
* ParanoiaFuel: The Agency is trying to develop conditioning so it works safely and cheaply on adults. Do they intend using it for [[DayOfTheJackboot widespread civilian control]] in a country [[UtopiaJustifiesTheMeans currently torn by violent internal divisions?]]
* TheScrappy: Allesandro and Petra in the eyes of some fans, due to the TeacherStudentRomance aspect of their relationship.
* {{Sequelitis}}: Despite being based on what is generally agreed to be the best part of the manga, ''Il Teatrino'' was poorly received in Japan and abroad for lesser animation quality, low or incorrect detail on the guns (in a series generally obsessive about firearms detail), inferior music to the original animation, and a complete swap-out of [[TheOtherDarrin the entire vocal cast in Japan]]. It was also more action/thriller oriented than the first season, reflecting the manga, but considered to be to its detriment.
* ValuesDissonance: Any Italian would find all of the relationships unspeakably cold and distant since the author, in a classic case of cultural projection, has depicted the characters with Japanese reserve instead of Italian ''brio'' -- even to the extent of them bowing on occasion.
** This becomes a bit of FridgeBrilliance for the relationships between the girls and the handlers/staff because it represents just how ''uncomfortable'' everyone is around these walking killing machines. And the distance between Giuseppe and Jean is part of the ''point'', though many of the more background characters are straight examples.
* TheWoobie: As a consequence of being an IllGirl, Angelica excites a great deal of sympathy from many readers - to the extent that many were actually dissatisfied with her appearance in ''Il Teatrino''. Although Angelica was alive at the equivalent point in the manga, the first series of the anime ended with her implied death and many considered her reintroduction to have spoiled a beautiful tragedy.

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