* AngstWhatAngst: Averted rather beautifully with Hiccup. He still has some lingering self-esteem and image problems that he had in the movie. Seeing as he was pretty much 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.
* 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.
* 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!
* DudeNotFunny:
** Snotlout mocking Toothless's inability to fly without Hiccup. Twice.
** He also mocks Hiccup's leg in "Breakneck Bog."
** Snotlout teasing Astrid about her uncle dying after being frozen by the Flightmare. Seems that Snotlout has a habit of doing this.
* EnsembleDarkhorse: The twins. This is mainly because both of them are a ''walking'' CrowningMomentOfFunny.
* 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 just about 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.
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* FunnyAneurysmMoment:
** Anything Bucket does, once you find out in "Portrait of Hiccup as a Buff Man" that he acts the way he does because a dragon ate half of his brain. Although this was actually implied from the first episode, when part of one of Mildew's anti-dragon diatribes involves pointing out that Bucket took the head injury that requires him to have the bucket welded to his skull as a makeshift plate from a dragon.
** 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.]]
* 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 RunningGag in ''Live and Let Fly'', a mishap with the grappling function of Hiccup's shield caused Gobber and Hiccup (later, Stoick) to be pulled together in a SuggestiveCollision. Following the WordOfGay in regards to Gobber in HowToTrainYourDragon2, his awkward "hope no one is looking" comment is rather amusing.
* 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.
* RescuedFromTheScrappyHeap: [[spoiler: Mildew]] has one after suffering a MyGodWhatHaveIDone moment. [[spoiler: Subverted when it is revealed he was working with Alvin the whole time.]]
* 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.
** Snotlout himself isn't well-liked in-universe, either, to the point the village ''cheered'' when they thought he died in battle in "Cast Out, Part 1".
* 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.
* TakeThatScrappy: Whenever Mildew or Snotlout get abused or suffer LaserGuidedKarma.
* UglyCute: Dragons, as usual. Particular mention goes to Meatlug the Gronckle, Fishlegs's placid and spectacularly ugly GentleGiant of a mount.
* ViewerGenderConfusion:
** In-Universe example. Gobber decides to re-name a baby girl "Magnus" because he thinks it looks more like a boy.
** Snotlout also has trouble telling which of the twins is supposed to be the girl sometimes. Not to mention many viewers keep confusing who is named Ruffnut and who is Tuffnut. Ruffnut even gets her hair cut, which would have helped clear the confusion up, but it is back to normal by the next episode.
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