* AngstWhatAngst:
** Averted with Hiccup. He still has some lingering self-esteem and image problems that he had in the movie. Seeing as he was ostracized by his entire community up until recently, this is very understandable. Played straight, however, with Hiccup seemingly having no issues whatsoever with his prosthetic foot. Any comment he makes about it is incredibly snarky, but with no trace of angst.
** Considering that most of the adult men of Berk have at least one prosthetic, this isn't all that surprising. Losing a limb seems more like a mark of pride than anything else in their culture.
** Averted with Heather. For good reason, she has a lot of baggage [[spoiler: especially after Dagur kills her parents]].
* AuthorsSavingThrow: After the second film was directed by someone who had no involvement with the series and openly stated he made no effort to keep it canon, ''Race to the Edge'' goes to some lengths to reconcile the differences so people aren't forced to choose which canon they prefer.
* AwesomeAnimation: The animation is at times on par with the original movie, which is quite impressive for a weekly animated series.
* AwesomeMusic: Most of the {{leitmotif}}s from the original film show up in series, with several new arrangements of each appearing.
* BaseBreaker: Dagur's new look as of "Race to the Edge". While most admit the shorter-hair-after-being-a-prisoner is pretty accurate, a lot of people do not like the beard. And even those who don't mind the idea of Dagur growing a beard don't like how patchy his is. And people apparently really miss his Loki-helmet.
* CompleteMonster: The [[AxCrazy fittingly-titled]] Dagur the Deranged is a gleefully violent madman who usurped control of the Berserkers by [[{{Patricide}} murdering his]] pacifist father Oswald the Agreeable, and shortly thereafter sought any means to [[WarForFunAndProfit incite a war]]. Dagur proceeds to [[ChronicBackstabbingDisorder backstab]] and try to murder nearly everyone he comes across, mostly for [[ForTheEvulz sick thrills]], hurling knives at Hiccup and trying to kill his friends, electrocuting [[BigBad Alvin the Treacherous]] to near-death to seize his tribe, threatening to cut off the legs of one of his (disguised) henchmen, and taking early opportunities to hunt dragons, regardless of whether or not they could fight back. His tactics to destroy Berk include direct attacks, holding Stoick as a hostage, and driving tamed dragons into frenzies. After breaking out of prison three years after his initial defeat, Dagur perpetrates a massacre of an island village, wiping out the family of Heather (made worse due to the fact Heather is [[spoiler: his sister]]) while continuing to act like a psychotic {{Yandere}} towards Hiccup and trying to kill men he's trading with with no apparent gain from it. Psychotic and wantonly violent, Dagur was the only truly irredeemable villain in the otherwise [[VileVillainSaccharineShow idealistic and fun series]].
* DieForOurShip:
** Heather received hate before she even debuted. When it was said that she might "threaten Hiccup's love for Astrid", the shippers went nuts. This became HilariousInHindsight once she actually showed up, not only in that she treated Hiccup more or less like all the other boys, but in that "Heather Report 1&2" is more about Heather's relationship with Astrid than her relationship with Hiccup. Not to mention when Heather is leaving Berk she totally ignores that Hiccup clearly has his arms open for a hug, just saying goodbye to him while still hugging Toothless and Astrid. Really, she's more likely to interfere with Hiccup/Astrid due to LesYay with Astrid than stealing Hiccup away! It happens again when she returns in season three, with a similar result: The girls having a RomanticTwoGirlFriendship that you half expect to get a RelationshipUpgrade.
** Some shippers are also like this with [[FoeYayShipping DagCup]], the Dagur and Hiccup ship. Poor Astrid usually loses her CharacterDevelopment so that the Berserker and Hooligan's relationship can exist.
* DracoInLeatherPants: Dagur gets this treatment in fanfiction, usually to justify why he is psychotic and to make him appealing. The fact that he's the youngest villain, not to mention the most competent, wins the crowd quite a bit.
* EnsembleDarkhorse:
** Heather has proved to be pretty popular after her first two-parter, enough to get another one in season three that also begins an arc that will surely mean she will be showing up again.
** Fans quickly became attached to the chicken Tuffnut bonds with in ''Race to the Edge''.
* FandomRivalry: With fans of ''WesternAnimation/GreenLanternTheAnimatedSeries'' and ''WesternAnimation/YoungJustice'' after the WesternAnimation/DCNation block was put on hiatus for nearly three months with reruns for this show.
* FoeYay: Between Dagur and Hiccup every time they interact, starting in "The Night and the Fury"; lampshaded by the latter as being rather uncomfortable. Indeed, at the end of the episode, Dagur seems more upset by Hiccup personally betraying him than Berk's possession of domesticated dragons. Just ''look'' at Dagur's behavior as well! He wanted to spend time with Hiccup and gets annoyed when his friends keep showing up, is angry upon learning of the bond between Hiccup and his bond (implying clingy possessiveness), and mentioned he couldn't stop thinking about him ever since the Berk incident. He wants Hiccup to "kiss his boots" in one episode, and obsesses over it. Get's even more blatant in ''Race To The Edge'', when Dagur sets up a SadisticChoice he is actually disappointed Hiccup would choose to rescue his friends over fighting him.
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* FunnyAneurysmMoment:
** Astrid's zeal in being a dragon slayer in the movie. Just her being a typical Berk Viking and actually being competent at it, right? Now consider how her uncle died and the effect it had on her family's honor and suddenly it takes on a chilling tone. [[FridgeHorror She is unlikely to be the only case like that.]]
** The villagers' excited chanting of "VikingFuneral" [[spoiler: since Stoick's in the sequel]].
* GeniusBonus:
** The writing system used in both the movies and series is a real alphabet known as the FUTHARK, commonly referred to as "Runes". The ancient Vikings used it both as a written language and considered each letter to be a powerful magic, which is still used in many occult practices.
** In season three, we see what look like strange triangles all over ''The Reaper" and in the projections of the Dragon Eye, this is a writing system known as Cuneiform, considered by many historians to be the oldest form of written language in the world, predating even ancient Egyptian Hieroglyphs
* GrowingTheBeard: While most people agree that season 1 and 2 are far better than any recent series based on an animated movie, ''Race to the Edge'' has blown all expectations out of the water with just its first thirteen episodes, with much better writing, CGI effects, and character designs. All in all it seems Netflix has managed to make a decent show into a ''great'' show.
* HarsherInHindsight:
** ''Every episode'' that features Stoick after HTTYD, "Crushing It" deserves special mention, when he starts suffering Empty Nest Syndrome.
** Everything about Heather when she returns in season three. The biggest probably has to be what she told the Berkians initially about pirates attacking her village and leaving her an orphan, [[spoiler: which was a lie]]. Three years later, her words come back to haunt her [[spoiler: when Dagur destroys her village and kills her foster parents]].
* HilariousInHindsight:
** Stoick going to consult an unintelligible oracle in "Animal House", after his original voice actor GerardButler was known for doing the same thing in ''Film/ThreeHundred.''
** The FoeYay between Hiccup and Dagur, after David Faustino's [[WesternAnimation/TheLegendOfKorra other big show of the time]] ended with a canon gay couple, which his own character started out standing in the middle of.
* HoYay:
** ''Race To The Edge'' gives more than a little HomoeroticSubtext between Snotlout and Thor Bonecrusher, [[spoiler: AKA hypnotized Fishlegs]], Astrid even says Snotlout is in love with him, and when [[spoiler: Fishlegs returns to normal]] Snotlout kisses him on the cheek and says Bonecrusher broke his heart.
** Astrid and Heather had some LesYay in season one, but season three turns it UpToEleven. The two become so close you would think they had been best friends since birth.
** In a blink-and-you'll-miss-it moment in season three, Ruffnut blatantly starts coming on to Heather. She leans against the wall in the possessive bad-boy flirtation pose and everything.
* IdiotPlot: Tuffnut spend an entire episode trapped in a net with Barf and Belch nearby all because nobody could think of the most obvious solution to get him out: have one head simply bite or burn the net while the other head is placed under him for him to sit on.
* JustHereForGodzilla: Face it, at least a fourth of this show's audience is just watching to see the new dragons.
* MagnificentBastard: As of "We Are A Family", Alvin has attained this status after [[spoiler: preforming a plan that would involve Mildew being betrayed and forced to work with Hiccup, [[BatmanGambit knowing full well Hiccup's overly trusting nature]] would end up teaching Mildew the training techniques while trying to escape. They think Mildew preformed a HeelFaceTurn and HeroicSacrifice without realizing that he was acting so Alvin can learn the art of dragon taming]].
* MoralEventHorizon:
** Mildew crossed it in "Alvin and the Outcasts". Getting the dragons exiled was bad enough, but then he intends to sell Hiccup out to the outcasts. And just to make sure the viewer knows this isn't a "needs of the many" kind of choice, he gloats about it to Astrid.
** Alvin himself crosses it by [[spoiler:threatening to kill Heather's parents to force her to be TheMole.]]
** It's heavily implied Dagur crossed this a while back by killing his own father. With an axe, no less. And if that doesn't do it for you, the reveal that [[spoiler: he killed Heather's foster parents and most of her village certainly will.]]
** Heather herself nearly crosses it by [[spoiler: attempting to murder Dagur]] after saying that they would only capture, but Hiccup revealing that [[spoiler: Dagur is her brother]] stops her. Though it's implied that during the time skip she is [[spoiler: willing to use lethal force]] on InnocentBystander Vikings while raiding their ships.
* {{Narm}}:
** Hiccup delivering a line foreshadowing the second film's wing suit ''directly to the camera'' in "Gone Gustav Gone," like something out the pre-GrowingTheBeard Dreamworks films.
** "This changes everything." Besides being uttered every time in the opening, when Hiccup first uses the line he had just discovered the dragon eye's projections and couldn't even read the symbols it displayed, making the line feel somewhat nonsensical.
* NightmareFuel:
** The Screaming Death is a mutated Whispering Death, second only to the Red Death in terms of size, and one of the most dangerous dragons seen. It's even in-universe Nightmare Fuel for the dragon riders and they can be seen clearly terrified every time it shows up.
** Dagur casually recounting what are probably his father's last words, begging Dagur to put down an axe. And then offering to help Hiccup off Stoik. Hell, Dagur in general, a CompleteMonster violence-prone teenager who commands an armada and is hellbent on hurting the heroes, even taking command of the previous villain's men by seemingly dispatching him. TeensAreMonsters indeed.
** ''Race to the Edge'' gives us [[spoiler: the Death Song, a dragon that lures other dragons in with its siren song and then imprisons them in hardening amber so it can easily devour them. If the pile of bones from its past victims isn't bad enough, we see it carry various dragons off to their doom ''on screen''. What's more, the Deathsong is STILL OUT THERE. Last we see of it, the gang sealed it in a cave, but Hiccup himself states that it might not hold. To add salt to the wound, it's likely that there's an entire SPECIES of it.]]
** In ''Race to the Edge'', the [[{{MacGuffin}} Dragon Eye]] that Hiccup finds initially releases gas that causes Tuffnut to go into a seizure. No one bats an eye, but anyone who has witnessed seizures would find it troubling to see.
* OneTrueThreesome: Hiccup and Astrid are the canon OfficialCouple as well as easily the biggest FanPreferredCouple, so its easy to see that no one is getting in the way of that. So when Heather formed a deep bond with both of them, fans were quick to just ship all three together rather than split Hiccstrid.
* RescuedFromTheScrappyHeap: [[spoiler: Mildew]] has one after suffering a MyGodWhatHaveIDone moment. [[spoiler: Subverted when it is revealed he was working with Alvin the whole time.]]
* RonTheDeathEater:
** Astrid and Heather are usually subject to these, often on opposing sides.
** Don't even get started on the numerous fanfiction stories that portray Stoick the Vast as an [[AbusiveParents Abusive Father]]
* TheScrappy:
** Mildew wasn't exactly well-liked considering his desire to get rid of Toothless and the dragons, but the events of "In Dragons We Trust" [[spoiler: where he frames and ''succeeds'' in exiling them has driven the last nail in]]. Then the hate for the guy skyrockets with each attempt to restore the status quo at the expense of the dragons, such as [[spoiler: trying to poison, which could kill, the dragons]]. Heck, he's even TheScrappy In-Universe!
--->'''Bucket''': It took us three days to dig Mildew out!
--->'''Mulch''': And the rest of our lives to wonder why we bothered...
** Snotlout's dad may have joined him. Outright threatening your kid for the possibility of not winning a game (one that the kid has won plenty of times before, to boot), and the sheer panic Snotlout displays when he thinks he'll lose (indicating that his dad was totally serious), has made him pretty divisive. He got a KarmaHoudini too, since Hiccup just let Snotlout win instead of addressing the real problem with someone. Then he has a KickTheDog moment in "Race to Fireworm Island" when he advises Snoutlout to abandon an ill and dying Hookfang and find another dragon.
* SpecialEffectsFailure:
** Though the animation is pretty good, the series tends to stumble in action sequences, particularly dragon breath. By watching episodes like "The Terrible Twos", it's obvious they put extra effort into the fight scene near the end of "Alvin and the Outcasts".
** The physics of the show are quite schizophrenic; some episodes use full-on motion capture for the human characters, while others use stiff-looking manual rigging for all motion. Watch an episode such as "Portrait of Hiccup as a Buff Man" with this in mind, and it becomes difficult to take your mind off the blocky and robotic motions of the characters.
** An especially jarring thing about the animation is the hair. Hiccup's hair almost always gets a lot of detail, while the other's don't. So you go from a closeup of Hiccup riding Toothless and his hair is moving just like it would in real life, and then you go to a close up of the twins and their hair (which is much longer than Hiccup's) is separated into three chunky blocks that move very unrealistically.
* StoicWoobie:
** Stoick, especially when he [[spoiler: chooses to let Thornado go to rescue baby Thunderdrums and take care of them]]. It takes him another season to admit that he [[spoiler: misses Thornado]].
** Gothi is revealed to be this, given she survived an attack [[spoiler: from a Snow Wraith]] that killed her companions while on a quest to find healing glacial water.
* UglyCute: Dragons, as usual. Particular mention goes to Meatlug the Gronckle, Fishlegs's placid and spectacularly ugly GentleGiant of a mount.
* ViewerGenderConfusion: Many viewers keep confusing who is named Ruffnut and who is Tuffnut.
* TheWoobie:
** Hiccup, every time Toothless is in danger like in "When Lightning Strikes," and in "Portrait of a Hiccup as a Buff Young Man."
** Heather, in ''Race to the Edge'', almost becoming a WoobieDestroyerOfWorlds.
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