Dragons: Riders of Berk (renamed to Dragons: Defenders of Berk for the second season) is an animated series that picks up where How to Train Your Dragon left off.For centuries, the inhabitants of Berk were locked in a violent struggle with the dragons, until Hiccup learned how to tame them. Once he managed to finally reconcile their differences, the two species lived Happily Ever After. Ha! Yeah, right. The many problems of having a massive horde of untrained but otherwise friendly dragons quickly becomes apparent, and anti-dragon sentiment begins to stir up once more. Determined not to let the whole cycle start up yet again, Hiccup resolves to teach the dragons to work with the Vikings in everyday life. Despite a rough start, he learns to channel their instincts into productive tasks, so Stoick puts Hiccup in charge of a new dragon academy to encourage this behavior. Of course along with the daily troubles of keeping the dragons in check, outside forces such as a rival viking clan likewise present challenges for the young dragon trainer.This series shares a Character Sheet with its parent film.Not to be confused withDragonriders of Pern.
Averted in "Viking For Hire", where we see Ruffnut kicking Tuffnut sharply in the posterior, which Tuffnut says he asked her to do to get the feeling back. Then Ruff turns around and asks her bro to return the favor (though we only hear Ruffnut being kicked and don't see it).
Any time Astrid punches is usually playing the trope straight, although sometimes it's her brand of affection.
Adult Fear: So your most hated and feared enemy wants to kidnap your son, and has succeeded once. How well are you sleeping Stoick?
Adults Are Useless: Played with. Stoick and the other adults are clearly capable, but they are often out of their element when it comes to dragon-related matters which make up much of the plots that occur. (See their ambush in "Alvin the Traitor" and Gobber in "Viking for Hire")
All Animals Are Dogs: Meatlug invokes this. In "When Lightning Strikes", she pants and wags her tail.
All-CGI Cartoon: Like the film it's adapted from. The animation is close to film quality, though slightly more limited, and everything is noticeably smoother and brighter compared to in-series flashbacks to the film. From the third episode onward, the animation progressively improves.
All There in the Manual: Stoick's dragon was confirmed to be named Thornado on the wiki prior to it actually being named in "Dragon Flower".
Always Lawful Good: "Animal House" establishes that all dragons have 'protective instincts' for humans and especially their riders. Every 'evil' action committed by a dragon in the series thus far is either: a mother looking for its child, brought on by a toothache, or ignorance that their action was causing trouble.
One exception: in "What Flies Beneath," a Whispering Death had a longstanding, seemingly murderous grudge against Toothless. Later on, at season's end it's the same dragon species (the same beast?) that Alvin picks as his own dragon.
The second season introduces a few more exceptions. There's the Screaming Death, which is extremely powerful and seems to have it in for the vikings of Berk; and the Skrill, which is as dangerous as Toothless and completely Ax-Crazy.
Amusing Injuries: Ruff and Tuff are always seen hurting each other out of boredom. They do it so much that the group doesn't consider it weird.
Hiccup: Look for anything unusual. Fishlegs: Does that count? (The group watches as Ruff and Tuff ram head first into each other) Astrid: Hmm, nothing unusual here.
Anachronism Stew: Fishlegs makes a reference to the Deadly Nadder's magnesium-based flame... centuries before magnesium would be discovered.
Same with one of Hiccup's attack names for Toothless' fireballs. He orders Toothless to use 'plasma blast' on at least one occasion, but it's really unlikely plasma has been discovered yet...
Anchors Away: In "Alvin and the Outcasts", during his fight with Stoick, Alvin the Treacherous swings around his own ship's anchor by its rope.
Arson, Murder, and Lifesaving/Chew Out Fake Out: In "How to Start a Dragon Academy," Stoick Invokes this when he talks to the kids about the "consequences" of disobeying him and releasing the dragons to do chores, but Gobber excitedly interrupts and blurts out the plan to give the teenagers a dragon training academy, ruining the intended effect.
Artistic License - Physics: In "When Lightning Strikes," the lightning bolts seem to be following Toothless around in the sky, eventually hitting him. Lightning is caused by an imbalance of charge between the clouds and the ground, and therefore is highly unlikely to strike anything that's in flight and not grounded. The episode actually pays lip service to proper lightning physics, (lightning strikes more easily at metal objects with high elevation,) but misses out on the whole "grounding" requirement. However, lightning strikes aircraft frequently —- and small aircraft have always been the most vulnerable. http://www.scientificamerican.com/article.cfm?id=what-happens-when-lightni
Artistic License - Geography: Islands can be brought underwater by rising sea level, but they do not sink by having tunnels burrowed into them unless you essentially took the top off of a mountain, which would instead cause it to fall due to gravity and with a strong enough tide be pushed away. Though to their credit, they do show the water coming up through the tunnels the Screaming Death left.
Big Damn Heroes: Twice in "Heather Report, Part 2". Heather swoops in with Stormfly when the riders are being overwhelmed, then later the Monstrous Nightmare Astrid tamed comes to her rescue. Alvin was seriously impressed with the latter.
Fishlegs in Fright of Passage where he shows up with Stormfly to give Astrid, Toothless, and Hiccup help.
Astrid:"How do we stop the Flightmare before it reaches the village?" Hiccup:"Fishlegs!" Astrid:"How's he gonna help?" Fishlegs:"By bringing you some reinforcements!"
Once again, Fishlegs, in Appetite of Destruction. This time, be brought the entire Gronkle population on Dragon Island, and was followed shortly with Deadly Nadders in similar numbers.
Big Eater: In "The Terrible Twos", Torch the baby Typhoomerang manages to eat its and Toothless' food (a single fish, and a hundred fish) in the time it takes Toothless to turn his head.
Fishlegs and Meatlug as well, seen in The Iron Gronckle, but with clear consequences as they stagger back into town.
Blatant Lies: Mildew when he claims that he had no idea that the flowers he purchased would harm the dragons. Stoick and Hiccup, unsurprisingly, weren't buying it.
Bolt of Divine Retribution: The Vikings believe all lightning is this, particularly when a freak lightning storm hits after they install metal dragon perches.
Suspected by Fishlegs as to why islands disappeared.
A Boy and His X: This still applies to Hiccup and his Night Fury Toothless, but the other Viking teens have also bonded very strongly with their dragons.
Brain Bleach: For all the things Gobber has seen and had happen to him, none were so horrible as being forced to extract dragon venom from Mildew's behind. He decides to cope by going into the forest to scream.
Breather Episode: The sportsmanship-themed "Thawfest" comes between the action-heavy two-parter "Heather Report" and the intense and emotional "When Lightning Strikes".
The Bus Came Back: Torch, who first appeared in "The Terrible Twos" as an infant, returns in "Zippleback Down" as an adult.
Toothless does his upside-down, toothless smile to a sheep in "Animal House".
In "How to Pick Your Dragon", Hiccup takes Stoick on a ride through the clouds in the same manner as he took Astrid on her first ride. It even uses the same music.
In the same episode, Astrid tries to dissuade Stoick from walking right up to Stormfly and touching her on the nose. This is because, as stated in the film, that's the breed's blind spot and therefore Stormfly has a minor freak-out.
In "Heather Report, Part One", an angry Astrid throws her axe at some trees, like she did in the film when Hiccup was beating her at Dragon Training.
In "Heather Report, Part Two", Tuffnut says "wait for it..." right before the Zippleback lights some gas, just like when Hiccup was waiting for the red death to start charging its shot.
In "When Lightning Strikes", Hiccup awakes from a near-death experience with Toothless at his side. He takes a moment to confirm that he still has his good leg.
"The Iron Gronkle" features Meatlug dragging Hiccup off to parts unknown yet again. Just like when it happened in "Gift of the Night Fury," someone asks him where they're going and Hiccup shouts out "I have no idea!" as they fly uncontrollably into the sunset.
In Tunnel Vision, Hiccup leads a giant dragon on a marry chase into a rock formation. They even used similar camera angles as the movie!
In-universe example in Fright of Passage where Astrid quotes her dead uncle word for word when confronting the Flightmare.
Musical callbacks come again when Hiccup meets the Screaming Death in Appetite for Destruction. It seems the Screaming Death has a lietmoff.
Cardboard Prison: Heather's repeated escapes from the cells of Berk show they could do with some improvements.
Cassandra Truth: Astrid can't convince Hiccup that Heather is trying to steal the Book of Dragons despite mounting evidence to that effect.
In "How To Start A Dragon Academy", the dragon dung, which was once used as a constant source of Toilet Humor, makes a comeback at the end of the episode to, ahem, fertilize Mildew's garden, saving him "three month's extra work".
Hiccup's Opening Narration generally turns out to be the key to saving the day, directly or otherwise.
Astrid recalls a brief tidbit given by Snotlout of all people on Monstrous Nightmares to deal with one on Outcast Island.
Hiccup and later Fishlegs lecture Astrid on Terrible Terrors being territorial and thus perfect to act as messenger hawks. Astrid quotes it, leading to a Eureka Moment for Fishlegs at the climax of Appetite for Destruction.
Chekhov's Skill: In the opening to "Twinsanity" Fishlegs shows that he's taught Meatlug hand signals just in case, and Hiccup gets the others started on it. It's later used to fake a full-scale dragon attack without the kids needing to give verbal commands. Even Meatlug's "hug" trick was effective as an attack, as Hiccup predicted earlier.
Chuck Cunningham Syndrome: By "In Dragons We Trust", all of the "background" dragons are completely gone, and it is implied that the five main dragons are the only ones living in Berk. "Alvin and the Outcasts" shows that numerous dragons are attacking the titular Outcasts, which suggests they simply went there to wreak havoc.
It can also be assumed that they are simply doing their own thing, instead of just hanging around in Berk. Being more like welcome travelers than permanent residents at the moment.
The dragons are back in "Twinsanity", when the gang are rounding them into temporary hiding.
Circling Birdies: Ruff and Tuff always seem to try to make each other "see stars" when they are hitting each other.
Clear Their Name: The plot of the "In Dragons We Trust"/"Alvin and the Outcasts" two-parter, where Hiccup has to prove Mildew is framing the dragons. He ultimately fails, but events conspire to allow the dragons to earn their way back in, regardless.
Happens again in "When Lightning Strikes", forcing Hiccup to extreme measures to protect Toothless.
Combination Attack: One effect of the training the team does during Heather Report - most notably with Astrid and Snotlout working together to attack with flaming quills.
There's also been at least one instance of the twins working with Fishlegs—Barf and Belch will fill a wide area with flammable gas, and then Meatlug uses her more condensed fireball to light it all on a fly-by. This proved rather effective at burning Outcast vessels, as seen in Alvin and the Outcasts.
Thornado and Toothless combine their attacks when strafing Avlin's ships, turning Toothless' small plasma blast into a wide area-of-effect scattershot which completely covered ships with a spray of shrapnel from the split plasma blast.
Fishlegs had one in the episode "In Dragons We Trust". When Hiccup was trying to get Fishlegs to stop giving information that a dragon was involved, he just wouldn't stop.
Continuity Nod: Sheep carrying (used significantly in "Animal House") and hatchet throwing appear as skills judged in the Thawfest games.
This happens again in "When Lightning Strikes" when Hiccup is struck by lighting and gets knocked out. Upon waking he see Toothless in the same position he was in when he woke up at the end of the film and makes sure he hasn't lost his other foot.
Convenience Store Gift Shopping: Stoick does this at Trader Johann's vessel before leaving for a meeting with the chief of another island and purchases a very nice sword to bring as a gift.
Crippling Overspecialization: Gobber's issue in "Viking for Hire" is that he specializes in designing weapons for use against dragons. Unfortunately, getting him to accept that anything dragon-related does not require weapons is an exercise in futility. Then it turns out his talents make him a great dragon dentist.
Death Glare: Hiccup is surprisingly good at delivering these, if only very rarely. Not much of a surprise, given that Stoick is a master at giving these to people. Toothless' glares are both intimidating and backed up with plasma blasts. Astrid's prone to intense glares when she gets pissed off as well.
In order for Alvin to be a threat to Berk, the dragons had to be exiled on top of the armory being destroyed. As soon as they get their dragons back, the battle is quickly won in favor of Berk.
One wonders why, when Astrid is the most capable of the young vikings, she has never won at Thawfest, especially when one of the main events involves axe-throwing, which is pretty much her thing. Cue Fishlegs constantly screwing her up for two of the first three events, knocking her off the log roll and throwing his axe early, right into hers, so Snotlout can win them all and tie with Hiccup, who took all the dragon events.
The Ditz: Hookfang, Snotlout's Monstrous Nightmare. Highlights include not noticing Snootlout jumping off him for a trust-fall and not noticing Snotlout yelling for help for a few seconds due to watching a falling leaf.
Genius Ditz: Gobber is definitely out there, but he knows things about dragons even the Book of Dragons (and Hiccup) doesn't know.
Downer Ending: So Hiccup and Toothless have escaped Outcast Island safe and sound. Everything is okay, right? Wrong! Turns out Mildew was just pretending to be on Hiccup's side and is now teaching the Outcasts how to train their own dragons.
Dragon Rider: The most impressive and combat-oriented part of dragon training, pioneered by Hiccup and Toothless and practiced by the Five-Man Band of teenage vikings. Adult vikings have also begun to take an interest, with Alvin the Treacherous and his Outcasts quite taken with the idea of learning the art from Hiccup (whether he's willing to teach them or not), and chief Stoick also willing to learn.
Dramatic Irony: "When Lightning Strikes" has the island stirred up over what they believe to be Thor bringing destruction upon them for harboring a Night Fury ("the unholy offspring of lightning and death itself"). Any viewer even marginally familiar with the behavior of lightning will realize that the giant metal dragon perches they built at the start of the episode are the cause of the strikes. Hiccup eventually makes the connection. Amusingly, at the end of the episode Hiccup and the village know that the metal causes the lightning, but assume that Thor was angry at the metal rather than understanding electricity.
Everybody Hates Mathematics: Ruffnut and Tuffnut suck at counting. It's unfortunate for them the Academy involves doing quite a bit of measuring and data collecting.
Evil Plan: As of the Season 1 finale, the below plans have merged.
Mildew will stop at nothing to banish the dragons from Berk. He thinks they're Always Chaotic Evil because he spent his life fighting them. In truth, every episode further proves they're actually Always Lawful Good.
"Alvin and the Outcasts" establishes Alvin The Treacherous with a different goal; he wants to conscript 'the Dragon Conquerer' (i.e. Hiccup) so he have his own Dragon Riders.
Extranormal Institute: The Dragon Academy, where Hiccup and his friends develop and self-teach Dragonology and dragon training. Lately, they have had to do more militarized training via Dragon Flight Club in order to defend Berk against Alvin and his dragons.
Face Palm: Ruffnut does this after Snotlout gives Alvin his bludgeon.
Fake Difficulty: Gobber states that he and Stoick were "Lucky to get back alive," from the treasure hunt. However, his later comments seemed to indicate that he and Stoick simply dug up the beach for a few days before giving up. Justified that it was a puzzle based on mentally figuring things out, which is why Hiccup could solve it in a day. Plus he and his friends had their dragons to get around some of the problems.
False Dichotomy: Arguably present in the "Thawfest" episode. Letting Snotlout win is presented as the only option Hiccup has to be a good friend and not a bad winner, even though this solution ignores the real problem. Namely, that the approval of Snotlout's father seems to be dependent on Snotlout succeeding in what is essentially a game with no real consequence beyond some prestige.
Fantastic Science: The dragonology and dragon behaviorism Hiccup and his friends study (and discover) at Berk Dragon Academy. Recently expanded and started to focus on combat oriented elements due to Alvin learning how to train dragons and other threats rising up against Berk.
Faux Affably Evil: Alvin the Treacherous, who treats all his evil actions with a casual disposition, despite clearly relishing it.
Fire-Forged Friends: Stoick and his dragon finally see eye to eye after fending off a herd of angry boars in "How to Pick Your Dragon".
Flat World: The residents of Earth believe the Earth is flat, as shown in "When Lightning Strikes." Astrid spins a yarn about how a relative of hers set sail to find the edge of the world - when she came back from the other direction they assumed she got lost.
The plot for the final act of the third episode "Animal House" was hinted at rather subtly throughout the first two, with the dragon's protective instincts kicking in at random intervals to save their trainers, and Stoick, Bucket, Mulch, and Mildew all griping about the hard work they have to do before the Freeze hits Berk.
In "The Iron Gronkle", one of the Whispering Death eggs is a lot bigger than the others, and whatever hatched made a much larger hole than the young ones. This is clearly meant to be the Screaming Death that will feature later in the season.
Frame Up: In "In Dragons We Trust" Hiccup begins to suspect foul play when the dragons seem responsible for a new outbreak of property damage. He's proven correct when he discovers dragon limbs hidden at Mildew's house.
Free-Range Children: Hiccup and the others move with quite a bit of freedom, though being the island's main dragon riders and all the Mundane Utility that comes with it certainly has something to do with it.
Frothy Mugs of Water: Averted. Hiccup is quite clearly seen getting his dad a drink from a tankard in the second episode.
Full Boar Action: Stoick has to fend off a herd of these in "How to Pick Your Dragon".
Fun with Acronyms: The Dragon United Monitoring Brigade, DUMB, in "In Dragons We Trust." Astrid even notes they need a new name when Gobber says the teens are wearing sashes with "Dumb" written on it.
Genre Blindness: Hiccup never seems to understand that when Toothless is acting hostile, there is usually a very good reason for him to do so. Hiccup will more often than not just think Toothless is moody. Likewise he will casually dismiss other's suspicions as overreacting, such as when Astrid tried to warn him of Heather working for Alvin.
In "In Dragons We Trust" while looking through Mildew's house, Hiccup sees a wall with portraits. They're ordered wife, wife, wife, then sheep.
Hiccup: At least we know he has a type.
In "Animal House", as Mulch walk in to the Great Hall with just two yak, Mulch says that they (the yak) were the only two they could find and then pipes up that they can start breeding a new herd with the two they have. Then, Gobber casually strolls in and says that Mulch may want to check again.
In "The Defiant One", Snotlout tells Hiccup to "go suck rocks."
In "Race to Fireworm Island", the twins... milk a Fireworm dragon off screen. And just in case the joke wasn't obvious, Hiccup confirms that Fireworm dragons do not lactate.
There are two Curse Cut Short in "Worst in Show": the first being where Snotlout asks Fishlegs if he wouldn't mind getting his nose out of Hiccup's... and Ruffnut stating "Looks like he grew some...".
Hiccup asks Snotlout what the first thing he does in the morning is. Snotlout begins to address one morning problem, so Hiccup quickly jumps ahead to "eat".
Gilligan Cut: In "Breakneck Bog", Hiccup tries to go alone to find Trader Johann, only to get caught in the act by Astrid and Snotlout. He agrees to take them along so long as they keep the others out of it. Cut to the entire group riding their dragons.
Gory Discretion Shot: Used in "Race to Fireworm Island" when the Fireworm Queen jabs Hookfang with her tongue. Thankfully, this was just to cure Hookfang of his lack of flame.
Also used in regards to the death of Fearless Fin Hofferson in flashback when he confronts the Flightmare.
Grumpy Old Man: Mildew, who hates dragons with a passion and tries to use any opportunity to get rid of them.
In "Heather Report" part 2, Bucket proves himself to be befitting this role as he walked int Heather's apparently empty cell without calling for backup. He ends up locked inside when Heather sneaks out.
Two Outcasts in "We Are Family Part 2" fall for Toothless playing dead and remove the muzzle on his mouth to feed him by hand. Toothless promptly breaks out. They also thought the changewing had escaped when they couldn't see it inside the cell.
Gobber asleep on the job in Fright of Passage, where he's asleep while the Flightmare is supposedly incoming. He accidently activates a loaded catapult and fires it into some sheep off screen.
Hyperspace Arsenal: In "Breakneck Bog", the group has to sacrifice their weapons to a pack of metal-hoarding dragons. Between them, they manage to unload an arsenal that could have armed half their village.
I Have Your Dragon: In "We Are Family Part 2" Alvin tells Hiccup he can either help him train dragons or Toothless will suffer.
Impossible Task: During the fireweather of "Zippleback Down", Stoick tells Hiccup to "make sure the twins don't do anything stupid". The hopeless look on Hiccup's face says it all.
Imperial Stormtrooper Marksmanship Academy: Alvin's crossbowmen miss from virtually point-blank. Largely thanks to this being a children's show on Cartoon Network. Inverted with most of the Deadly Nadders we've seen up to this point, who are frightfully accurate with their tail spines.
Improbably Female Cast: Not the main cast but if you pay attention to the children, so far most of them are girls.
Informed Ability: Or in this case, lack of one. In "Thawfest", it is stated that Hiccup loses every single event. How it is described makes it sound like he comes in dead last in every event. However during the games he often comes in either second or third (usually behind Astrid). Though it doesn't help that only the winner of the even gets a point, so second is treated as last.
Informed Attribute: When Hiccup usually describes the horrible weather of Berk during his narration as "snowing 9 months and hailing the other three", most of the time it is usually sunny and clear (though it could still be cold).
In "Alvin and the Outcasts", Hiccup gives himself up to Alvin the Treacherous to save the villagers, promising to prove his reputation as the "dragon conqueror". They take him to Dragon Island, where he is able to get Toothless and turn the tables on them.
In "We Are Family Part 2" Hiccup tried this on an outcast guard, but didn't have the strength to knock the guy out.
Karma Houdini: Mildew gets away with framing the dragons and rendering the village vulnerable to attack from the outcasts, and the only real "punishment" he suffers is the dragons earning their way back into the village. Stoick is suspicious, however, and Hiccup makes it clear he'll be watching.
Subverted beautifully for Mildew in "Dragon Flower" where it looks like he was going to get away with trying to poison and kill the dragons, but starts suffering Amusing Injuries one after another near the end. The only thing more appropriate would have been exile. Not only that, but he is on Stoick's bad side for his actions, who is now aware he is trying to get rid of the dragons.
Now Mildew's status as one is gone completely as of "When Lightning Strikes" with a statue of Thor placed in front of his home where lightning is guided through the statue's hand and into his home. Literal Laser-Guided Karma.
Dagur. They needed him to sign the treaty, so instead of killing him (which it looked like Stoick might do) they had to trick him instead. Gets some comeuppance in The Night and the Fury where Hiccup beats him in what was essentially single combat while Toothless was tied up.
Kill It with Water: The Scaldron, first mentioned in the film, shoots boiling water instead of fire.
Kill It with Fire: Most dragons, naturally, with fire ranging from traditional fire out of Nadders and Nightmares, to magma bursts out of a Gronkle, to the Night Fury' plasma blast.
Knight of Cerebus: Alvin the Treacherous. Not only is he actually pretty terrifying, he's completely ruthless. At the end of Season 1, he learns dragon taming.
The Vikings of Berk have brokered a fragile peace with the dragons they once fought, with the once-ostracized chief's son Hiccup (a Handicapped Badass) leading the younger Vikings' efforts at studying, domesticating and riding the dragons.
Hiccup's handicap itself is this; losing his leg is one of the more emotional moments at the end of the film.
Late to the Punchline: Tuffnut has this problem in "Heather Report, Part 1", not getting Ruffnut's analogy about Astrid being jealous of Heather.
Let's Get Dangerous: At the climax of "Gem of a Different Color," Fishlegs finally decides to give Snotlout what he's had coming for a long time.
Living MacGuffin: Hiccup as of "Alvin and the Outcasts". Alvin and his outcast vikings call him the "dragon conqueror", and believe that they too can learn to ride dragons by capturing him.
Meatlug, briefly, during The Iron Gronckle due to being the source of Gronckle Iron.
The Load: Snotlout. Puts on a tough guy act, but can never back it up. It really says something that even Tuffnut and Ruffnut have been more use than him at times, and the twins spend more time on-screen injuring themselves. Fishlegs is also far from this trope, too, because he actively helps Hiccup in gathering information with Astrid and nearly has as much information as him aside from several areas. Averted in "Defiant One", as Snotlout is shown to be a decent combatant when engaged in hand-to-hand, even against trained adults who were nearly twice his size.
Alvin: (addressing captives) ...and let me be clear, that name was earned.
Make Me Wanna Shout: The Thunderdrum, first mentioned in the film, makes its appearance in "How to Pick Your Dragon". It has a sonic scream, though its ability to scream someone's head clean off was exaggerated by the Book of Dragons.
The Masquerade: Introduced in "Twinsanity", where Stoick doesn't want another tribe to find out about the dragons and get the wrong idea. The tribe having an insane new chief eventually drives the kids to faking a dragon attack using their own dragons in order to just get him off the island and save Barf and Belch. In said attack, you can see Toothless isn't wearing his artificial tail fin, in order to preserve appearances. And the kids solely use hand signals to control the dragons.
Broken in The Night and the Fury where Hiccup drops it to save Toothless. The Berserkers were not happy about that.
The series unexpectedly jumps from Slice of Life episodes to the dragons getting exiled and an imminent invasion by Berk's enemies.
"Twinsanity" introduced teen chief Dagar the Deranged. While his villainy is mostly played for laughs, it's also very creepy. Stoick, of all people, very nearly attacks the teen with a sword three times in the episode.
Fright of Passage flips from the seriousness of Hiccup, Astrid, and Fishlegs pursuing the Flightmare to stop it from destroying Berk and Snotlout trying to get into the twin's "secret bunker" with an increasingly hilarious set of demands.
Monster Is a Mommy: "The Terrible Twos" introduces a new species of dragon in the form of a baby Typhoomerang. Its mother, naturally, isn't happy that her baby has been taken.
My God, What Have I Done?: Hiccup appears to have a minor version of this during the Thawfest games just as he was about to beat Snotlout. Realizing what the desire to win is doing to him, he decides to throw the race.
Mildew has one in the season 1 finale when Alvin decides that he's outlived his usefulness and throws him in prison with Hiccup. This is a subversion as it was part of Mildew's plan to buddy up with Hiccup and obtain his dragon taming knowledge.
My Horse Is a Motorbike: Inverted with Snotlout, as he uses his dragon like a motorcycle, right up to holding his horns like ape hangers when riding him.
As of "Dragon Flower", it has been mentioned once, in passing, by Tuffnutt as a joke.
Alvin clearly states he will kill Heather's parents if he doesn't get the book.
While nothing is explicitly stated, Stoick rather clearly is about to kill or at least maim Dagar three times in Twinsanity. It was explicitly stated that Dagar wanted to kill dragons, and that Berk used to do so during the war with the dragons.
In We Are a Family, the twins blow up a fake Night Fury near Astrid and Fishlegs. Astrid chews them out because if it was Toothless they could of killed him.
At the start of Live and Let Fly, Hiccup states that Alvin had him ready to be executed.
Although nothing explicit is ever stated, it is pretty clear that Fearless Fin Hofferson (Astrid's uncle) was killed by the Flightmare.
Stoick is outraged when Dagar the deranged insults his own dead father, to the point of pulling a sword on him.
Astrid gets in on the act in Fright of Passage when Snotlout makes choice remarks about Astrid's dead uncle.
Nice Job Breaking It, Hero: In "Viking for Hire", Mildew takes pleasure in pointing out to Hiccup that by making peace with the dragons, he put Gobber out of a job, which sets Hiccup on a quest to find Gobber a new line of work. Thankfully, Gobber's skills translate well to dragon dentistry.
Hiccup, trying to apologize to Fishlegs, accidently starts a mob of people disappointing in no Gronckle Iron and causes Fishlegs to panic, filling Meatlug up with a variety of rocks to try and make the metal and causing her to run through town attracting everything she passes.
Mildew's attempts to highlight Hiccup's failures usually provide him with the inspiration to correct them.
Hiccup was powerless against Alvin until Alvin agreed to take Hiccup back to the Isle of Dragons, to show how he can defeat dragons, and ends up reuniting Hiccup with Toothless.
No, Except Yes: In season 2 episode "Live and Let Fly" when Hiccup and Stoick are arguing, Stoick asks if Hiccup is arguing with his father's orders. Hiccup replied he wasn't arguing with his father's orders, but his chief's poor idea.
No Flow in CGI: Averted rather beautifully. The characters' hair and clothing detail are almost on par with the film itself, the only major difference being that the fur on the character's clothing has been either drastically shortened or removed completely.
Snotlout, after being lit on fire attempting to climb onto Hookfang's back in "Animal House", screams, runs and dives into the nearest source of water, griping that "this was the third time this week that it happened".
When Astrid makes a strange suggestion in "The Heather Report Part 2," Fishlegs wonders out loud if she's "been eating dragon nip again." This earns him an elbow to the gut.
Number Two: Astrid is this to Hiccup. She states that if Hiccup is unable to be the leader of the Dragon Academy she takes over. Not that they would like that.
OOC Is Serious Business: You can tell how bad Dagar really is by the fact that Stoick almost attacks him three times, despite needing him for a peace treaty.
Oddly Small Organization: The Dragon Academy consists of only six teenagers and their dragons. Weirder still in that while we have seen other children, those six appear to be the only teenagers on Berk.
Offscreen Teleportation: In "The Terrible Twos", Toothless hurls Torch, the baby dragon Hiccup finds, out of his bedding area due to not being too fond of him. He turns around and shrieks in shock when he finds Torch right behind him no more than a second after he had tossed him. Later on, as they're trying to return Torch to the mother, Hiccup leaves Torch while escaping only to find Torch has already caught him again moments later.
Not seen on screen, but Stoick mentions another chief who did not bring a gift to the meeting of chieftains 'left without his head'.
Taken further in "Twinsanity" when a visiting teenage chief almost beheads Belch.
Oh Crap: Hiccup in "The Terrible Twos", when the rather ticked off mama Typhoomerang spots him holding her missing baby.
Happens again in "Heather Report, part 1", where Hiccup fails to keep the Book Of Dragons out of Alvin's hands.
Savage gets a moment of this when enough metal falls through his ship, putting a hole right into it.
Snotlout gets a taste of this in Fright of Passage when he's making rude remarks about Astrid's dead uncle.
Open Heart Dentistry: Gobber, a blacksmith by trade, is entrusted with the care of a dragon with a very significant hole in its wing and Fishlegs goes to him to tend to Meatlug after ingesting too many rocks. Well, the series is supposed to be set in Dark Age Europe.
Many of the villagers are pretty much just a copy of another. This clearly shown when Heather's parents look exactly like the couple that Stoick helps in "How To Pick Your Dragon" in herding their boars.
There are quite a few identical Outcast mooks, also.
Palette Swap: To make the main cast's dragons stand out, all others of the same species are recolored in various patterns.
Plot Hole: The series takes a few cues from the special Gift of the Night Fury. The show is meant to take place directly after the film (see Immediate Sequel above), while the special is implied to take place well after that. Among the details used are the fact that Meatlug is female and that dragon eggs explode, both of which were surprises in the special.
Poor Communication Kills: The plot of "The Terrible Twos" could have been avoided if Toothless had a reliable way of communicating "You took the baby and the mother is pissed."
Portmanteau Dragon-Rider Name: While gloating in "Thawfest", Snotlout claims that he and Hookfang have become so close that they should be called "Snoutfang". Hiccup retorts that Snoutfang will lose to "Hictooth."
Properly Paranoid: Hiccup automatically assumes Alvin has learned to train dragons in the season 2 premiere, reasoning that Mildew will likely cave under torture (Hiccup doesn't know he's a traitor).
Pyrrhic Villainy: Mildew's efforts to frame the dragons leave the village open to attack by its enemies (because his final act was to destroy the armory, leaving the village without any weapons), and he still has the nerve to blame the dragons for it. Of course, he can't very well admit responsibility without admitting to treason.
Reasonable Authority Figure: Stoick. He's more lenient with the dragons' antics than he could be, given the trouble they cause, and treats exile as a very last resort. When Hiccup comes to him claiming that Mildew framed the dragons and disposed of the evidence, he seems inclined to believe his son, but can't just accuse someone of treason without proof, either. Much to the annoyance of everyone (and the audience), Mildew tends to abuse this trait of Stoick's when doing things concerning the dragons.
Relationship Ceiling: The show doesn't seem to make up its mind about whether Hiccup and Astrid are a couple after the events of the film or not. During most of the show they never seem to go beyond Platonic Life Partners, and in "Animal House" they even have a recoil reaction when they realize they were instinctively hugging each other for keeping themselves warm in the snow. However, there is plenty of Ship Tease to go around, peaking in "Thawfest" when Astrid kisses Hiccup ON THE LIPS AGAIN. This is probably due to the writers trying to maintain the Status Quo until the sequel film. The other members of the group seem to be fully aware that they are dating but this doesn't stop Snotlout from hitting on her.
Remember That You Trust Me: Despite the lessons of the first film, Stoick remains wary of the dragons, and whenever a problem arises that Hiccup struggles to solve, is quick to suggest they may have to get rid of them. Justified as part of the Reality Ensues setup; like it or not, Stoick has to keep what's best for Berk in mind.
Remember the New Guy: Alvin the Treacherous is an old rival of Stoick and foe of Berk village, yet "Alvin and the Outcasts" is the first time the viewer has heard of him. This is lampshaded in the episode when Alvin can't believe Stoick never spoke of him to Hiccup.
Rule Number One: When starting the Dragon Flight Club rule one is to not talk about it. This confuses the twins.
The Runner Up Takes It All / Second Prize: Hiccup intentionally loses to Snotlout in the Thawfest games in "Thawfest". Snotlout gets to keep his family's winning streak, while Hiccup gets a secret approving beam from his father and a kiss from Astrid; definitely good consolation prizes.
Runt Of The Litter: Any person or animal named "Hiccup" is considered one. It's a viking tradition.
Sacred Hospitality: Though not seen, it is implied when a chief visits the others at the meeting of the viking chiefs they receive it, provided one brings a gift to the host as thanks for the shelter and protection. The last chief who failed to provide a gift left without his head. Overall, gift giving seems to be a big part of Viking culture with one episode implying that this is the primary way of apologizing.
Saved by the Awesome: In "How to Start a Dragon Academy", when Hiccup and friends make amends for the dragons' extensive property damage by demonstrating their utility (disobeying orders to keep them caged), Stoick rewards them with a So Proud of You and a gift of the old arena, re-purposed into a Dragon Academy.
Saying Too Much: In "In Dragons We Trust", Hiccup begins to suspect Mildew of framing the dragons when he mentions that Toothless was left outside the Great Hall. Since he lives on the other side of the island and it's the middle of the night, it's highly unlikely that he would be around to notice.
Schizo Tech: Parasols made of metal and stone and, of all things, flamethrowers, exist in a show that is supposed to be set between Dark Age Europe to the High Middle Ages. These might be a throwback to the book, since one of the villains made a steamship using dragons.
Shoot The Dragon: When Hookfang goes wild in "Viking For Hire", Stoick is ready to get back to dragon-slaying with Gobber by his side.
Apparently, Gobber's father, if his comments are anything to go by... and he passed those on to Gobber himself. We don't get to see it, but that's partially because the dragons fled before he could start "training" them using real weapons...
Smooch of Victory: Hiccup gets one from Astrid at the end of "Thawfest", though it's for doing the right thing instead of winning (he could have, but threw the match for Snotlout's sake).
So Proud of You: In "How to Start a Dragon Academy", Stoick attempts this with the Viking teens via Chew Out Fake Out, but Gobber excitedly steps on his big speech for a bit before Stoick finally manages to deliver his praise properly.
In "Alvin and the Outcasts", Astrid gets grabbed here by Alvin as a hostage (so the dragons won't fire at him). Justified because there's a massive weight difference between them, and he also pins her against himself for a better hold. In addition, the second he's surprised Astrid hits him with an oar and bolts.
Also happens to Hiccup in "When Lightning Strikes", although in his case it's "Standard Skinny Teenager Grab Area".
To Hiccup again in "The Defiant Ones"
Start X to Stop X: In "Zippleback Down", Hiccup and the twins use a back burn to stop a forest fire threatening Berk.
Strange Minds Think Alike: In "Viking For Hire", when conducting a tribal induction ritual, Gobber decides an unnamed female baby looks more like a "Magnus" than a "Hildegarde", and renames her accordingly. While lamenting his tactless action, Stoick agrees in spirit.
Stoick: I'm not sayin' she didn't look like a "Magnus," but try telling that to her parents!
Sequel Hook: In Tunnel Vision, Hiccup points out that Whispering Deaths return to their homes to reclaim them as their own. Cue a shot of the Screaming Death nestled up with an offering of fish from his Whispering Death minions and Hiccup noting that they'll be back.
Super Speed: The Typhoomerang can get a speed boost by igniting itself like a Catherine Wheel firework.
Suspiciously Specific Denial: When asked where he's going at one point, Tuffnut replies that he is going somewhere to be alone and not to cry.
Swiss-Army Weapon: Hiccup has a shield which transforms into a crossbow and has a bolo/grappling hook built in.
Team Rocket Wins: Season 1 ends with Alvin having Out-Gambitted Hiccup and learned how to tame dragons himself, thus turning the Outcasts into a much more dangerous enemy for Berk.
Teens Are Monsters: Young Berserker chief Dagur the Deranged was quite clearly designed to be hated. Every single aspect of him pisses off not only the Berk vikings, but the viewers: before becoming a chief he'd torture the other viking kids on his dad's visits to Berk including purposefully starving Fishlegs and trying to drown Hiccup; all he wants to do on Berk is go the the arena and kill dragons; mocks his own dead father whom he's implied to have killed; threatens war at every turn; and almost kills Ruff and Tuff's Zippleback by cutting off Belch's head! Stoick moves to kill himthree times(twice's he's stopped by Gobber, and the third by Hiccup's plan)
Tempting Fate: In "Alvin and the Outcasts", Gobber notes, "This would be a really bad time to get attacked, especially by Alvin the Treacherous." Guess who lands on their shores later that day?
The Only One Allowed to Defeat You: This is Toothless' attitude toward the Whispering Death in "What Flies Beneath", even going so far as to scare away the other dragons and refuse Hiccup's help.
This Is Gonna Suck: In "Worst in Show", Hiccup is quick to notice that Fishlegs is taking the competition too seriously and something will inevitably go wrong, even going so far as trying to nip it in the bud later on. But naturally, things have to go wrong for the lesson to be learned.
Happens again in "Appetite for Destruction" when the Screaming Death returns.
The full previews for "In Dragons We Trust" practically spelled out who was framing the dragons.
The previews for the two-parter "Heather Report" are terribly unsubtle in painting Heather as a spy for Alvin.
Took a Level in Jerkass: During the Thawfest games, Snotlout goes from Jerk Ass to even-worse-Jerkass. Hiccup also dabbled in this trope a bit in the same episode by gloating, upsetting Astrid and Toothless. Of course, Hiccup realized it after being told off by Astrid.
Trojan Horse: In "We Are Family Part 2" Stoick knows Alvin will be expecting an air assault to take back Hiccup and Toothless, so they hide on Trader Johann's ship.
True Companions: Slowly over the course of the season, the bond between the Viking teens and their dragons are building. By the end of the first season, they are fully this and the dragons show it by moving to defend a bound Hiccup and Toothless in "We Are Family Part 2" without any prompt from their riders.
True Neutral: Trader Johann seems to be one as he would be willing trade with people of Berk and the Outcasts. This is subverted at the end of "We Are Family Part 2" when he helped Stoick with Hiccup's rescue.
Trust Building Blunder: In "In Dragons We Trust", Hiccup successfully convinces Snotlout to jump off Hookfang's back so his dragon can catch him as a trust-building exercise. Hookfang isn't immediately aware of this.
Hiccup still has shades of this due to his lingering self-esteem issues, even though Stoick is proud of him as he is.
The Thaw Games revealed to us that this is a large reason behind some of Snotlout's more Jerkass tendencies. When Hiccup points out that Snout's father looks angry, Snotlout's retort makes you cringe with sudden realization about who he really is.
This is the sole reason Mildew isn't punished for his crimes as Hiccup lacked solid evidence.
In "In Dragons We Trust", Hiccup realized Mildew knew too much by an off hand comment regarding what was happening and sought to get proof, knowing he would need it to convince Stoick. He does find proof but Mildew destroyed it. Later, when telling Stoick this, Stoick points out they now need new proof that Mildew was behind it.
In "Dragon Flower" Hiccup lacked concrete proof of intent from Mildew and the foreknowledge the flowers he bought would be harmful to dragons. Fortunately, they force him to participate in a search for a cure, which eventually comes down to subjecting him to an agonizing extraction procedure out of his behind.
In the first of the two-part Heather debut episode, Alvin reappears and obtains the Book of Dragons.
"We Are a Family, Part I": Hiccup finds a map to an island full of Night Furies. Unfortunately, it's bait for a trap set by Alvin and Mildew, and he and Toothless are kidnapped but the trope is fulfilled in the second part. Alvin can tame his own dragons and his first one is a Whispering Death, the natural enemy of the Night Fury.
"What Do They Fear?" Episode: In "Animal House", it's the livestock that are afraid of the now-friendly dragons, to the point that they are unable to provide any eggs, wool, or milk due to anxiety. Made worse as it's just prior to an oncoming storm.
What Happened to the Mouse?: At the end of "Heather Report" part 2, we don't know what became of the Monstrous Nightmare Astrid befriended in the Outcast camp and who saved her at the end. From the same episode, the outcast ordered by Savage to retrieve the book from the Gronckle is never seen again, and was implied to have been devoured alive by the same dragon based on his screams and items being scattered.
What The Hell Towns People: The plot of "When Lightning Strikes" is most of the town getting convinced by Mildew that Toothless is the cause of Thor's anger in response to the lightning strikes. Their irrational behavior causes them to turn on Stoick and the kids as well as nearly getting some of the cast members killed just to prove to them it was something else. To be fair, it's understandable that they'd do pretty much anything to avert the wrath of an angry thunder god, and they're still reasonable enough to watch Hiccup's demonstration.
Where I Was Born and Razed: Hiccups fear this trope occuring since Whispering Death hatchlings are territorial of their birthplace. and since the Screaming Death is variant of the whispering death (Who can also control them) he should be right to be worry.
Women Prefer Strong Men: While Hiccup wasn't pleased to see himself depicted as a overly-buff man on the chieftain/son shield painting, Ruffnut and Astrid showed a heightened sense of appreciation towards it.
The World Is Just Awesome: Like in the original movie Hiccup takes a person to see Berk in a new light. This time it is Stoick to show him some of the wonders of riding a dragon. Stoick completely agrees as he realized that he knew every tree on Berk, climbed every cliff, and every other facet but never in his wildest dreams did he think he'd see it from air.
Wouldn't Hit a Girl: Snotlout, apparently. In "Viking for Hire", he at least stops to check if it's Ruff or Tuff he's about to hit.
Snotlout: You're the guy, right?
Averted with Tuffnut, who does hit his sister... but she hits back just as often, so...
Wreathed in Flames: The series seems to have taken a liking to things that light themselves on fire, instead of just breathing it.
The Monstrous Nightmare, as in the film. It's a plot point in "Viking for Hire", as Hiccup noted that something must be wrong with Hookfang, since he never lights up when Snotlout's on him.
The Typhoomerang in "The Terrible Twos" also does this, lighting itself like a Catherine Wheel spinning firework. Not only does this make it fly faster, it also turns it into an airborne, spinning saw blade.
Then there's the fireworm dragons in "Portrait of Hiccup as a Buff Young Man", which are mouse-sized dragons with flaming skin.
Yes-Man: Alvin's right hand man Savage is a very dedicated example of this, though he does chide Alvin occasionally. Alvin uses his submissiveness to prove the point that most people will say anything to keep themselves alive.