!!![=YMMVs=] introduced by ''{{Anime/StrikerS}}'':
* ContestedSequel: Primarily because this is the first series that steps away from magical girl elements and toward a more military setting, but also because some characters are pushed aside in favor of new ones, Yuuno and Chrono being among the most frequently mentioned.
* EnhancedOnDVD:
** The TV version of the "Heartless White Devil" scene in episode eight of ''[=StrikerS=]'' made a lot of people think that Nanoha had some sort of [[ShellshockedSenior Post Traumatic Stress Syndrome]] from the {{timeskip}} between ''A's'' and ''[=StrikerS=]'' and that her reaction to Subaru and Teana's dangerous tactics in the mock battle made it look as if she wasn't fit to be training the two. The DVD version of the situation helped clear up any misgivings. She had more of a "disappointed parent" look on her face than the more ''[[HigurashiNoNakuKoroNi Higurashi]]''-like look in the TV version.
** Just before her legendary attack in episode 25, she stomps on the floor, possibly to brace herself, but more likely simply because of how [[HarbingerOfAsskicking badass it makes her look]]. In the TV version, some dust is kicked up when her foot pounds onto the floor. On DVD that part of the floor is destroyed. [[SarcasmMode Inexplicably]], many people seem to prefer the second.
** Various examples of [[OffModel QUALITY]] animation are fixed in the DVD releases as well.
* EnsembleDarkhorse:
** Cinque of the Numbers is fairly popular, despite only appearing in three episodes and being the only one absent from the final battle.
** Despite - or perhaps ''because of'' - her incredibly minor status, Sette is starting to gain popularity in some fanfiction circles. One popular topic is to expand on her fate - she is not in rehabilitation like the rest of the younger Numbers, but appears to be treated as less of a criminal than the older imprisoned Numbers, leaving open the possibility of her release.
* FanonDiscontinuity: For some. Which is to be expected given the very drastic changes in setting, compared to the previous seasons.
* GrowingTheBeard: The show is slow for the first ten episodes, focusing on training the new foursome and not very impressive battles against generic robots. Then Vivio comes along, and the plot and action kick in with force.
* HolyShitQuotient: Episode 17.
* {{Moe}}: Reinforce II, Vivio and the younger Subaru seen in flashbacks. Even Adult Nanoha still qualifies as this.
* MoralEventHorizon: Quattro crosses this when she brutally tortures Vivio and insults her mother Nanoha right in her face. If she didn't cross it then, she definitely did when she forced Nanoha and Vivio to fight each other. Especially with her line, "Now kill each other, like a good mother and daughter".
* NeverLiveItDown: Nanoha's BloodKnight reputation was already around by the time of ''A's'', but after her abortive brawl with Signum in the manga [[http://danbooru.donmai.us/post/show/142341 there was no going back.]][[note]]Note that this is a coloured and enlarged, but otherwise completely unaltered panel from the canon ''[=StrikerS=]'' manga.[[/note]]
* StrawManHasAPoint: Regius is one of the few people who distrusts Hayate for her criminal past, and even Auris suggests that he keep his opinions to himself. While the viewers and those close to her know she did nothing wrong during the Book of Darkness incident, he and much of the rest of the Bureau apparently heard a version of events in which Hayate accepted full responsibility, making his distrust seem more logical if ultimately incorrect.
* TheyWastedAPerfectlyGoodPlot:
** Nanoha's [[spoiler: near-death experience]] is very underplayed, although the belief that something like that might happen again is why she is hesitant to adopt Vivio at first, and she later resolves to make sure it does not happen again for Vivio's sake.
** Regius's distrust could have segued into political intrigue and been expanded, but gets forgotten about very quickly.
* ToyShip: Erio and Caro.
* ViewerGenderConfusion: Otto. Female, for the record. This is compounded by her use of the masculine pronoun "[[JapanesePronouns boku]]", and the fact that many of her fellow Numbers are unsure of her gender.
* TheWoobie:
** Vivio. She gets better in time for ''SoundStageX'' and ''Manga/{{ViVid}}''.
** Agito. The poor thing was used as a lab rat by misterious scientist and it was almost completely [[BreakTheCutie broken]] when Zest and Lutecia rescued her. She recovered her enthusiasm and becomes a loyal [[FusionDance Unison Device]] to Zest only to see him die at Signum's hands. Agito was taken under Signum's wing and they started to slowly develop close bonds and the little redhead eventually grow genuine feelings for the Blazing General. Came ''[[NanohaForce FORCE]]'' and she witness how Signum is near killed in front of her eyes while she's unable to do anything to help her beloved master. Life has been pretty harsh on this little device.
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