* AccidentalInnuendo: Happens InUniverse in ''Fumoffu'' episode 8, when Tessa says she's in the "water business"; though she's obviously referring to her being a submarine captain, the term is Japanese slang for prostitution. The English version handles this by changing it to "getting wet is my business!" (which is also lampshaded as a poor choice of words by Kaname)
* BaseBreakingCharacter:
** There is no middle ground when it comes to people's feelings toward [[BigBad Gauron]]. They either love him for being a [[AxCrazy psychotic]] StalkerWithACrush that [[NoOneCouldSurviveThat just won't die]], or hate him for being a [[ForTheEvulz shallow villain]] that doesn't have a grander purpose in life.
** Tessa gets this to an extent, as fans are split between loving her for being an adorable klutz with some great moments of badass, and hating the inappropriate, borderline-stalkerish way she pursues Sosuke.
*** ''The Second Raid'' only made things worse; the storyline kicks off with Tessa ending Sosuke's bodyguard mission, denying him permission to explain or say goodbye to his friends, and then reaming him out in a debriefing, seemingly entirely because of her jealousy towards Kaname and frustration at Sosuke's lack of response -- all of which leads to Sosuke suffering a HeroicBSOD and subsequently deserting Mithril briefly. Eventually Tessa sees reason and improves, but some fans have a hard time letting this one go.
* CompleteMonster:
** [[AxCrazy Gauron,]] aka [[BloodKnight Mister Iron]], is [[TheHeavy the main villain]] of the first season of the show. A former mercenary from Hemaljistan (Afghanistan in the light novels) Gauron was the {{archenemy}} of main character, Sosuke Sagara, long before the series began. In flashback, we see that Gauron was responsible for killing all of Sosuke's comrades in Afghanistan. In the present day, Gauron kills a KGB agent he was working for when the man argues with him. He then hijacks an airliner after killing the captain, threatens to murder all the high-school students onboard if the authorities refuse to cooperate, and kidnaps Kaname, whom he has subjected to experiments. When that plan fails, Gauron returns months later, working as a [[NukeEm nuclear]] {{arms dealer}}. When Sosuke and his new team try to interfere, Gauron kills all of them except Sosuke, [[EvilGloating gloating]] the entire time. He later hijacks the Tuatha De Danaan submarine, planning, again, to kidnap Kaname, and threatening to sink the sub. That's in Season 1. In Season 2, we find out he's the one behind the actions of CreepyTwins [[BrainwashedAndCrazy Yu Fan and Yu Lan]], whom he sends to kill Kaname as a means of screwing with Sosuke, before blowing himself up in a final attempt at TakingYouWithMe. In all of his appearances, he is incredibly proud of the number of Sosuke's friends he has killed, constantly rubs it in his face, and seems to be trying to push Sosuke into [[DeathSeeker killing him]]. A truly sick individual, Gauron is engaged in a game of psychological warfare with a 16-year-old kid, all because of a warped StalkerWithACrush obsession.
** Mr. Gates (aka Mister Kallium), Gauron's successor and head of Amalgam's Execution Squad, is [[AxCrazy even crazier]] than his predecessor. In his first appearance, he shoves a man out of a helicopter for questioning his predictions about how a battle may have progressed, has all his former allies slaughtered, then has a FreakOut and kills the men who did it. He later tries to ambush the heroes and kill them, using an attack in a public place as a way to draw them out. He's a truly warped sexual predator as well; he's heavily implied to be taking advantage of teenage girls Yu Fan and Yu Lan, admits to being [[ILoveTheDead a necrophiliac,]] and is seen masturbating to images of kittens and squirrels. A spectacularly BadBoss, he drowns one of his men in a pool for bringing him bad news. In the Season 2 finale, after Leonard Tesstarossa has killed one of the twins, Gates uses her corpse as part of a puppet show to taunt the surviving twin, whom he then murders, before making his final assault on Mithril.
* EnsembleDarkhorse: Tessa, to the point where she gets her own O.V.A. all about her day.
* EvilIsSexy: Yu Lan and Yu Fan so very much.
** Gauron is rather attractive for a middle-aged man.
* FoeYay: Gauron spends an awful lot of his time thinking about Sōsuke. Not to mention the whole "I love you Kashim!" thing. Or how, in the novels, he said he would've wanted to kill him and fuck his corpse.
* HarsherInHindsight: Chris Patton and Mike Kleinhenz played ex-COSMOS child soldier Yu Ominae and Fatman in the Spriggan OVA. Here they play Sousuke and Kalinin. [[spoiler:It becomes more painful that Sousuke finds out that Kalinin has gone rogue and has to face that fact that he needed to fight him.]]
* HoYay: Gauron towards Sōsuke. Overlaps with FoeYay.
** It is now completely canon. Watch the [[http://fmp-misha.livejournal.com/5090.html#cutid1 TSR comedy radio show]] where Gauron acts as the school's "sensei." Gato is doing this on purpose. Gauron orders Sousuke to write on the chalk board "Kashim loves Gauron Sensei. Heart. ♥" as well as "Gauron Sensei's extreme attack makes Kashim's heart pound. I want to have children with him." Followed by what appears to be an attempt to rape Sousuke in front of the class. Yay for subtlety.
* LauncherOfAThousandShips: Sōsuke. He's been paired with pretty much all the major characters, plus some side characters. Men, women, friends, enemies, characters ''much'' older than him, you name it.
** He would probably believe that "shipping" would be used in its actual sense.
* LesYay Mao has actually groped Tessa's breasts and spends an inordinate amount of time with her, often while inebriated, naked, and in a sexually charged mood.
** Also, Yu Fan and Yu Lan are first shown onscreen sharing a very intimate shower scene...
** Tessa and Kaname even share some Les Yay moments occasionally, despite being rivals for Sousuke's affections.
* {{Moe}}: Oh Lord, Sōsuke when he was young. Absolutely. Adorable. And very huggable, too. [[http://pics.livejournal.com/fmp_misha/pic/000371ee Especially when he's holding his Bonta-kun stuffed animal]].
* MoralEventHorizon:
** Gauron almost shooting Kaname's teacher for calling him a coward.
** Seina getting Kugayama to pilot the Behemoth by telling the kid, who thinks she's his sister, that she'll be nothing to her if he doesn't.
* NightmareFuel: Gauron actually wanted to kill Sousuke when he was eleven and canonically wanted to rape his dead body. It also gets even creepier when one realizes that their countless encounters are most likely not entirely coincidence... and that Gauron is heavily implied to be stalking him, actively choosing missions / jobs that would put him in a position to see his "precious boy."
** One word: [[http://www.youtube.com/watch?v=_KXf3kwjKQ0 POOONYYYYY!!!]]
** Episode 3 of ''Fumoffu'' has an interesting case when Sousuke envisions Kaname being tortured. The visual is of her being tickled with feathers, but because it's heavily pixelated, the viewer's imagination is entirely likely to fill in the details of something much, much worse.
* {{Squick}}: Wait, was Gates just whacking off, and all that was shown on screen was a picture of a kitten?
** Pretty sure that was a VisualPun.
* TheScrappy: Leonard Testarossa. Sure, he was made out to be a (relatively) "honorable," NobleDemon whose intentions, [[KnightTemplar extreme as they may be]], could be considered grander and more for the greater good than anything {{So|ciopathicHero}}usuke [[TheStoic would care for]]. However, his cockiness and InsufferableGenius, along with his superiority complex have earned him great ire among fandom. He ''especially'' gets flak after manhandling Kaname and {{brainwash|ed}}ing her, causing her to become an angsting DamselInDistress. And interestingly enough, being a PrettyBoy seemed to actually work ''against'' him, as numerous people have taken to despising him for being a SissyVillain, calling him "[[FanNickname Leotard]]". The funniest part is that he's ''supposed'' to be the [[UnintentionallyUnsympathetic most sympathetic]] villain that the series has (seeing how Gauron and Gates are [[AxCrazy psychotic]], insane pedophiles), yet he appears to be the most hated.
* UnintentionallyUnsympathetic: As stated above, Leonard was meant to be a fairly sympathetic villain, with his [[TheWoobie mommy issues]] and his [[WellIntentionedExtremist semi-noble goals]]. It didn't quite work out that way...
* WTHCastingAgency: The proposed LiveActionAdaptation has Zac Efron attached to the project. Cue the inevitable fandom cry of "It's gonna suck!"
** Can you image how more disturbing will Gauron obsession with Sosuke be, when it will involve musical numbers with 9 meter tall mecha.
*** Efron is at the very least [[OneOfUs a fan of the series]], and he himself said that the movie probably won't happen.
* TheWoobie: Both Kaname and Tessa on a few occasions.
** StoicWoobie: Sousuke, particularly when considering his backstory.
** JerkassWoobie: Xia Yu Fan and Xia Yu Lan.
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