Characters: How To Train Your Dragon Books

This is the character sheet for the How to Train Your Dragon book series. Please keep in mind that characters and character tropes in the How to Train Your Dragon films by and large do not apply here, given that the two series are significantly different, and should be kept to that character sheet. Beware of unmarked spoilers.
    open/close all folders 

Main Vikings

    Hiccup Horrendous Haddock III 

  • Cowardly Lion: In the books; understandable since he's only about ten. (Though he gets older as the books go on.)
  • Determinator: Oh, 'yes'.
  • Dork Knight: Hiccup is a Socially-Awkward Hero who became the top contender for Badass in Berk.
  • Expecting Someone Taller: Alvin couldn't believe that the famous "Dragon Conqueror" was 'Stoick's little embarrassment'.
  • Geek Physiques: Skinny and short in most of the books. Doesn't quite get as lucky during puberty as his movie counterpart, as book!Hiccup may be tall now, but he's still considered very much one of the Noodle People.
  • Iron Woobie: The horrible things that happen to him later on in the series don't phase him at all in the long run. After freaking out a bit, he gets his shit together and pushes on.
  • Kick the Dog: Hiccup's been on the receiving end of some pretty nasty things. Especially in the last three or four books. You just wanna give the poor kid a hug.
  • Made of Iron: Has survived very lengthy falls, nearly on the receiving end of fire blasts, smashing into several hard things, and even took a direct lightning strike and is still fine.
  • Major Injury Underreaction: In book 'How to Betray a Dragon's Hero' he tricks a dragon into swallowing him so he can stab it in the face with his sword. Of course, he's being swallowed whole... so when he is eventually spat out, he realizes that half his foot has been melted by digestive acids! It's barely even mentioned again after that paragraph!
    • Justified. His foot is completely numb, so it's logical that in such a stressful situation he'd forget about it quickly.
  • Nerd Action Hero: Combines his intelligence with his developing fighting skills.
  • Nice Guy: Hiccup is kindhearted, easy going and always willing to help.
  • Only Sane Man: More-so in the original books.
  • Red Baron: He is called the "Dragon Conqueror" by the Outcasts.
  • Red-Headed Hero: It's bright red and unruly.
    "He was entirely unmemorable. He DID have Heroic Hair, which was a very bright red and stood up vertically however much you tried to wet it down with sea water. But nobody ever saw that because it was hidden under his helmet most of the time."
    The Narrator, How to Train your Dragon
  • Red Oni, Blue Oni: He and Fishlegs are the blue to Camicazi's red.
  • The Runt at the End: 'Hiccup', in canon, is the name traditionally given to the runt of the litter. Also counts as Meaningful Name.
  • Significant Green-Eyed Redhead
    • Hiccup's green eyes showcase his Brains over Brawn compared to the other Vikings.
  • The Smart Guy
  • Speaks Fluent Animal: He's able to understand and talk to dragons based on long periods of observation.
  • The South Paw: After his right arm is dislocated in How to Be a Pirate, Hiccup has to swap hands during a swordfight. Turns out he was a leftie all along.
  • The Strategist: "Everyone, follow The matter how strange it may seem."
  • Tall, Dark and Snarky
  • Teen Genius: He's the most level-headed viking in his whole tribe and he likes learning about dragons.
  • Took a Level in Badass: He started off as a scrawny shy boy that no one noticed except when he messed up, and grew into a talented sword fighter and dragon whisperer who's saved the Archipelago several times and is prophesied to one day become the King who will unite the tribes again.
    • Book Hiccup is as much of a badass as movie Hiccup, given that he got first place in the free-for-all swordfighting tournament, even beating his own father.
  • Warrior Prince: A given in that he's the son of the chief.
  • Weapon of Choice: A sword.
  • Wise Prince: Also a given, considering he's an All-Loving Hero aside from being The Strategist and a Guile Hero.
  • Yank the Dog's Chain: In the ninth book.

    Stoick the Vast 

  • Action Dad: He never shies away from a fight against dragons.
  • The Atoner: Shows signs of this in the series over his previous attitude towards dragons.
  • Authority Equals Asskicking: The Chief of Berk knows no equal in battle.
  • Badass
  • Badass Beard: And proud of it.
  • Badass In Charge: The Chief of Berk.
  • Badass in Distress: Occasionally.
  • Beard of Barbarism: It is braided.
  • Berserk Button:
    • Hurt anyone he cares about, be it his son, village, or his dragon, and you're in big trouble. This is ESPECIALLY true in the books as seen when Skullion's (a species of vicious eyeless dragons) soon discover when they were about to harm Hiccup.
    • He reacts badly to people who mock those he does respect.
    • On a less extreme angle, he gets somewhat irritated when somebody makes a remark about his weight. Or interprets a statement as one about his weight.
    • On a more serious note, Alvin is this. All we know is that the events surrounding Alvin's banishment is not someone he wants brung up and gets angry quickly, which Hiccup found out when he tried questioning him about it.
  • Big Ol' Eyebrows:
  • Character Development
  • Dad the Veteran: He's been leading his tribe in battle for most of his life.
  • Defeat Means Friendship: In contrast to Hiccup, this is his approach to dragon-bonding. He ends up meeting his son halfway.
  • The Good King: He genuinely cares about his village and seeks to keep them safe and well. If he has to make a choice between personal and his duty as chief, the latter comes first.
  • Heterosexual Life-Partners: With Gobber.
  • Jock Dad, Nerd Son: He's always wished that his son had more beef on his arms but he comes to respect the "nerd" aspect of it as it helps him become a better chief.
  • Large And In Charge
  • The Leader: For the Hooligan tribe.
  • Papa Wolf:
    • Despite Hiccup's status as 'village failure', Stoick is still quick to protect his son from danger.
  • Redhead In Green:He has red hair and wears a green tunic.
  • Royals Who Actually Do Something: Takes his role as chief of Berk very seriously and is often one to lead the charge.
  • Significant Green-Eyed Redhead: Has bright, red hair and green eyes.
  • So Proud of You: To Hiccup, when he's not being disappointed.
    • Also zigzagged in the series but to a lesser extent. There are some kinks to work out in relation to the dragons and while he's more accepting of his son's scrawny stature he'd still prefer him to be buff and strong.
  • Stout Strength: He's very broad and very strong.
  • Why Couldn't You Be Different?: Hiccup fully knows that this is what his father thinks.

    Gobber the Belch 


  • Adorkable: Similar to Hiccup.
  • Bad Liar: Does not do well lying under pressure.
  • The Berserker: In How to Be a Pirate, Fishlegs discovers that he's a berserker. When he catches a cold in How to Cheat a Dragon's Curse, he sometimes involuntarily went berserk and started yelling insults at people bigger and stronger than he is.
  • Beware the Nice Ones: When he gets mad, he goes berserk.
  • Deadpan Snarker
    Fishlegs: Oh, how I wish I had a nice smart Bardiguard all of my very own, to chuck rocks at me, and send me unarmed into one-to-one combat with teenage psychopaths.
  • Geek Physiques: Described as being even weedier than Hiccup. He's the complete opposite of this in the movie-verse, however.
  • The Kid with the Remote Control: One of the most dangerous dragons in the series, the Deadly Shadow, has devoted its life to him.
  • Huge Rider, Tiny Mount: His Gronckle is far from tiny, but Fishlegs still is about a third of its size. It should be noted that, out of all of the dragon breeds encountered so far that are large enough to be ridden, the Gronckle is definitely the smallest.
  • Megane:
  • Nice Guy
  • Red Oni, Blue Oni: He and Hiccup are the blue to Camicazi's red.
  • Warrior Poet: In the series, he composes poems at sunset.


Daughter of Big Boobied Bertha, chieftain of the Bog burglar tribe and a good friend of Hiccup and Fishlegs.


  • The Ace: Basically the Ideal Young Viking.
  • The Bully: Constantly picks on and belittles Hiccup and Fishlegs. It's partly because he knows that Hiccup is a better hero than he'll ever be.
  • The Big Guy: Established as the best athlete among the kids, and despite his age is more than a match for many adult Vikings in combat.
  • Gag Nose: You can fit cucumbers up his nostrils. That's not hyperbole, Hiccup has actually done it (off-page).
  • Jerk Jock
  • Jerk with a Heart of Gold: At the very end.
  • Leader Wannabe: Wants to become the next chief of the Hooligan Tribe, even though Hiccup is next in line. Making it worse is that he tends ignore or argue with Hiccup, which gets them in trouble.
  • Pet the Dog: He's shown to honestly care about his riding-dragon.
  • The Resenter: To his cousin Hiccup.

    Alvin The Treacherous 

The Leader of a tribe of Outcasts and serves as the Big Bad of the book series. He wants to become King of the Wilderwest.

  • Artificial Limbs: As a result of losing various body parts over the course of the series.
  • Badass
  • Badass Boast: By proxy! Given by Gobber in his behalf:
    Gobber: "If there's one thing Alvin knows, its treachery."
  • Big Bad
  • The Chessmaster: This guy has shown his intellectual prowess and is one of the few who rivals Hiccup, although generally doesn't surpass him.
  • Dangerously Genre Savvy: Eventually stops trying to capture and/or torture Hiccup and starts trying to kill him immediately whenever they cross paths so he won't be able to foil his plans.
  • Evil Counterpart: To both Stoick and Hiccup. He is an intelligent and evil chief who leads through fear and a firm hold on power, where Stoick isn't the brightest light bulb on the chandelier but generally doesn't abuse his power in such a fashion. To Hiccup, who wants to make peace with dragons and possibly a world where all can be friends, Alvin wants dragons to conquer and destroy his enemies.
  • Evil Plan: To become King of the Wilderwest.
  • Faux Affably Evil: At first.
  • Genius Bruiser: Equally clever as he is strong; look at his gambit entries for proof.
  • Names to Run Away From Really Fast: Not the Alvin part, but certainly the "Treacherous" as he clearly has little intention of honoring a promise unless he can still get something out of it.
  • Would Hurt a Child: Has no qualms about attacking the main characters, even if they're just kids, and shows glee at the thought of seeing one of them eaten by a dragon.

    Big Boobied Bertha 
Leader of the Bog Burglar tribe and enemy of Stoick the Vast.



  • Defrosting Ice Dragon: To say he was hostile to Hiccup at first is an understatement. He is selfish and mean to Hiccup, eating his food and not listening to him, however in the climax he flies up a '''big dragonus giganticus maximus's nose, almost killing himself, to save his trainer
  • Exactly What It Says on the Tin: In the books he literally has no teeth. Eventually he grows a tooth near the end of the first book (though he loses it in a fight)
  • Heterosexual Life-Partners: An interspecies example. With Hiccup, a Viking human.
  • Porky Pig Pronunciation: In the books. He has a stammer, yet can pronounce words perfectly, which is odd for a dragon with no teeth.
    Toothless: F-f-f-fish! w-w-want fish! Now!
    Hiccup: We don't have any fish
    Toothless: Ok then. Eat c-c-cat!
  • Snark Knight: He'll snark and let people know it, but he is also extremely loyal and protective of the ones he love.
  • Tsundere: Toothless likes to switch among affectionate, aloof, and hostile at the drop of a hat.
  • Jerk with a Heart of Gold: He actually cares about Hiccup, as shown of the climax of the first book when he risked his life to save Hiccup from the Green Death.


A mood dragon belonging to Camacazi.

  • Easy Amnesia: Loses her memory after getting hit with a book in the Meathead Public Library.
  • The Tell: Turns violet when she lies. Which is often.
  • The Tease: Seems to enjoy flirting with Toothless.

    The Windwalker 

Hiccup's nervous and slightly shaggy riding dragon.

    The Deadly Shadow 

A triple-headed, sometimes Invisible, firebreathing, lightning-shooting, and very poisonous dragon that once belonged to Fishlegs' mother.

Heel-Face Turn: Initially sent to kill Hiccup by Furious, it ends up aiding him once it realises he's a friend of Fishlegs.Invisiblity: As expected from a breed of Stealth Dragon.Multiple Head Case: Innocence, Arrogance, and Patience. Fortunately, Patience has the most control over their body.Names to Run Away From Really Fast: So called because it can turn invisible and is ludicrously over-armed (three heads, each of which is poisonous and breathes fire and lighting).Red Oni, Blue Oni: Innocence is blue, Arrogance is red.Shock and Awe: The only dragon in the series to breathe lightning.

    The Green Death/Merciless 

  • Big Bad: Of the first book.
  • Breath Weapon: Like all dragons he's got one, but his breath weapon is one based on making pyroclastic clouds. Nothing near it stands much of a chance, until our heroes get into the fight.
  • Evil Is Bigger: This guy is HUGE.
  • Giant Flyer: It's as big as a mountain.
  • I'm a Humanitarian: Perfectly willing to eat other dragons if given the opportunity. Even - or maybe especially - members of its own species.
  • Kaiju: A dragon the size of a truck would generally be considered large in this setting. The Green Death can (and does) swallow those whole. In the books he eats a younger version of his own kind. Easy to believe, considering he considers normal dragons tasty snacks.
  • Large And In Charge: The other dragons are like flies compared to him.
  • Made of Explodium: It's breath.
  • Names to Run Away From Really Fast: Assuming the thing doesn't reach your boats first.

    Horror Cow 
Fishleg's dragon. A common-or-garden dragon, like Toothless, that is supposedly vegetarian. She is unwilling to kill animals and is a big sluggish to follow orders.

    The Dragon Furious 

A Seadragonus Giganticus Maximus, first encountered by Hiccup on the island of the Berserks. He frees it in exchange for his life and a promise that it will stay in the north of the world, away form humans, for one year.

Furious is defined by his all-consuming hatred of the human race, and is the Big Bad of the later books.

Big Bad: Leader of the Dragon Rebellion.Giant Flyer: Absolutely enormous and as good at flying as any other dragon.Unstoppable Rage: Exists in a constant state of screaming fury and hate. When he gets particularly worked up, his eyes burst into flames.

Dragon Species

    Dragon Species 
  • All There in the Manual: The Book of Dragons is this. In one of the shorts, The Book of Dragons, we learn about several more dragons. Some have appeared in the show proper, others, like the Snaptrapper and Timberjack, haven't.
  • Breath Weapon: Almost all dragon species have them, and most commonly they breath fire, which is created by expelling a flammable gas and then igniting it with sparks from a mechanism in the mouth/throat. Certain species have more unique weapons, though.
  • Foreshadowing / Early-Bird Cameo: A lot of times, dragons that are shown or mentioned in the book pop up later in shorts of the television series itself.
  • More Teeth than the Osmond Family: Generally, the bigger the head the more teeth it has. The current kings, however, are the Whispering Death (which has six rows of teeth that can rotate like a rock-cutter) and the Snaptrapper (which has four heads, each of which has three toothy jaws).
  • Predators Are Mean: There's a certain invocation of this. Canonically, all of the "friendly" species of dragon are piscovores (fish-eaters) and have no interest in animal flesh. Those few that explicitly or implicitly do eat non-fish meat, however, have been villains — first the Whispering Death, and then the Flightmare, who explicitly eats humans to boot.
  • Unreliable Narrator: Several facts about the book are shown to be wrong, including that the Scauldron DOES have venom ("Dragon Flower"), and in regards to some dragon types it knows nothing (case in point: Night Furies).

Terrible Terror

Introduced: the How to Train Your Dragon movie.
Small Stoker class dragons, Terrible Terrors may be small but they are no less dangerous than their larger kin amongst the dragons.

  • Instant Messenger Pigeon: Hiccup and Fishlegs turn them into this in "Appetite for Destruction".
  • Killer Rabbit: They are about the size of a medium-sized cat. That won't stop them from attacking larger foes. The fact that, according to the Book of Dragons short, they're social dragons who tend to hang out in dozens-strong packs, makes them even more dangerous.
  • Mythology Gag: They look just like the book's version of Toothless.
  • Pintsized Powerhouse: Like all dragons, it is stronger than its size implies.
  • Ridiculously Cute Critter: Especially when one sleeps next to Hiccup because he gave the dragon a fish.
  • Team Pet: Due to its size, there's no one small enough to ride one. That doesn't mean they aren't liked all the same. "Worst in Show" has the riders each adopting one in a competition to see who the best trainer is. No one wins since they get distracted by an attack from Alvin.
    • Hiccup and Fishlegs have plans to use them as carrier pigeons to deliver messages to Berk from far away, calling it "Air Mail".
  • Zerg Rush: While vicious on its own, a single Terrible Terror is not too much of a threat. But they are social creatures and tend to work in packs.

Hideous Zippleback

Introduced: the How to Train Your Dragon movie.
The iconic Fear Class dragon, this two-headed dragon exemplifies the bizarre nature of its class with its two heads which must work in tandem to be dangerous. One head breathes the gas, the other lights it, resulting in major explosions. The gas itself is also dangerous, but only with long term exposure.

  • Knockout Gas: The gas emitted by the right head can be this; after all, breathing flammable gas is never a good thing.
  • Multiple Head Case: Inverted in that the two heads work together quite well, with one providing flammable gas, and the other a pilot light.
  • Multiple-Tailed Beast: Two heads means two tails.
  • Organ Autonomy: The two heads of a Hideous Zippleback are distinct and do not share each other's thoughts. If the heads start arguing, the dragon can stall out, leaving it vulnerable to attack.
  • Stuff Blowing Up: Zipplebacks can create explosions when one head breathes gas and the other head generates sparks that ignite it.
  • Weaksauce Weakness: Throw a bucket of water onto the head that sparks the gas and it is unable to light its gas. That said, finding the right head is the trick.


Introduced: the How to Train Your Dragon movie.
The iconic Boulder Class dragon, Gronckles are relatively small and sluggish dragons, but extremely tough and strong.

  • Dumb Muscle: Gronckles are generally lazy and easygoing, but rouse them, and they're as temperamental and direct as an angry rhino.
  • Extreme Omnivore: It can eat rocks. And its Breath Weapon depends on this fact.
  • Limit Break: In the movie, it is stated they only have enough fuel for six shots. Meatlug and other Gronckles can be seen firing more shots during the series.
  • Magma Man: The Gronckle is one of the few dragons that doesn't directly produce flame. Instead, it gobbles up rocks and mouthfuls of soil and then heats them to a molten state inside its belly. This superheated rock is then spat out at targets as distinctive fireballs. With the right rock, it can also produce Gronckle iron, a lightweight metal that is tougher than period iron and excellent for weapon and armor crafting. Though whether it's a real material under a different name or not is unspecified.
  • Mighty Glacier: The slowest of the rider-sized dragons, but tough and its magma attack is pretty powerful. It can even stagger a Screaming Death simply by ramming into it and keeps coming back for more!
  • Mix-and-Match Critters: The Gronckle looks like a cross between a bulldog, a bumblebee, and a toad.
  • Mundane Utility: Amongst the dragons, Gronckles have the most of this. They can hover in place, they can ingest rocks to make materials (for example, with sandstone they can make glass), and can carry significant loads while flying.

Deadly Nadder

Introduced: the How to Train Your Dragon movie.
The Deadly Nadder is the iconic Sharp Class dragon, a category of dragons distinguished by their natural arsenal of spines. Amongst the most avian-looking dragons, these vainglorious dragons spend much of their time preening themselves.

  • Attack Its Weak Point: The primary weak point of the Deadly Nadder is the blind spot in front of its head. To correct for this, it will attack anything that even gently touches the nose or hears something it cannot see. As Gobber said, "Blind spot, yes. Deaf spot ... not so much." That said, trainers who build up strong rapports with their Nadders are allowed to touch them there.
  • The Fighting Narcissist: Deadly Nadders are extremely vain, evidenced by the generous amounts of time spent preening themselves.
  • Pirate Parrot: Deadly Nadders resemble crested parrots rather than the traditional lizard, with rounded beak-like heads, bright scales resembling tropical plumage, and lack of forearms.
  • Spike Shooter: Deadly Nadders can shoot spikes from their tail with frightful accuracy.

Monstrous Nightmare

Introduced: the How to Train Your Dragon movie.
The iconic Stoker Class dragon, Monstrous Nightmares are the largest of the common dragons and well-known for their violent streak and their copious firepower.

Night Fury

Introduced: the How to Train Your Dragon movie.
The Unholy Offspring of Lightning and Death itself, Night Furies are fast, stealthy, and hit with enough firepower to blow the tops of catapult towers into cinders. They are the most feared dragons amongst the ranks of the Vikings. They belong to the Strike class of dragon, emphasizing the classification's hard hitting firepower and speed.

  • Always Accurate Attack: Their plasma blasts were described by Hiccup in the movie to "never miss", which was backed up in that almost all of their attacks (in the film) hit their mark.
  • Badass: The fact they strike pure terror in a culture full of boisterous dragon-slaying vikings is any indication, they are this big time.
  • The Dreaded: Vikings will gladly fight any of the other dragons, even ones that can swallow them whole, and have a long and impressive list of kills. If this one's screech is even heard? They run for cover screaming "NIGHT FURY! GET DOWN!". So much so that it was the only dragon listed where Vikings are advised to not even attempt to fight it.
  • Informed Ability: In the tie-in ads and Defenders of Berk, it is mentioned that Night Furies only have six shots, similar to Gronckles. Toothless regularly fires dozens of shots in a fight.
  • Lightning Bruiser: They're called the unholy offspring of lightning and death.
  • Make Me Wanna Shout: Rare non-lethal variant (so far). "We Are a Family" reveals that they can use echolocation.
  • Metal Slime: Toothless is the only known Night Fury encountered so far, indicating either Last Of Its Kind or their extreme rarity.
  • Names to Run Away From Really Fast: Both its name and the Red Baron invoke this in the Vikings.
  • Nocturnal Mooks: Their coloring and fighting approach indicates that this is invoked.
  • Nothing Is Scarier: Extremely. Due to their rarity and almost never being seen, with the only known bit is how they are nocturnal and have an attack that is a Wave Motion Gun, Berk's residents were terrified of them.
  • The Quiet One: They are silent compared to most other dragons. Combined this with their firepower, speed, and camoflague, they are nightmarish when the sky is dark. This one of the reasons the Vikings are downright scared of these dragons in particular because you won't hear or know their presence until the moment of attack.
  • Red Baron: "The unholy offspring of lightning and death". In fact, the Night Fury is the only dragon in the movie to get a Red Baron like title.
  • Shock and Awe: Interesting that their dragon fire seems to give off this more than Playing with Fire. Also, if the battle with the Red Death in the movie is to go by, they have a concentrated blast so powerful they can topple the most gargantuan of dragons.
  • Super Senses: They can echolocate much as bats and some birds can, enabling them to maneuver in complete darkness and helping explain their accuracy when attacking at night.
  • Super Speed: One of the fastest breeds of dragons. Only the Red Death is known to have matched or exceeded its speed, and Stormfly (a Nadder) only gets close because of Astrid's training and care.
  • Wave Motion Gun: Their plasma blasts can do serious damage, toppling things like the Red Death or sinking ships in one hit.
  • You Are Already Dead: The Book of Dragons mentions that if you encounter one, you are pretty much already screwed.


Introduced: "Legend of the Boneknapper Dragon"
A large Mystery Class dragon, Boneknappers earn their moniker due to their macabre habit of assembling an armor of dragon bones to shield their bodies.

  • Arch-Enemy: To Gobber, until it's revealed why.
  • Collector of the Strange: It collects the bones of other dragons and wears them like armor.
  • Determinator: The Boneknapper that was Gobber's rival in the short. Its lifelong feud with Gobber has lasted for what can only be described as decades between the two. Even after being attacked by a Hammerheaded Whale and Yak being sent by Thor, not only did the dragon survive, but it continued to hunt Gobber until it got what it wanted.
  • Elemental Armor: The dragon bones it covers its body with qualify as this.
  • Heel-Face Turn: Once a Boneknapper gets all its bones, they become incredible docile. Best described by Gobber:
    Gobber: You give a BoneKnapper whatever it's looking for and it's just like an overgrown puppy dog.
  • Make Me Wanna Shout: Gains this ability once it has every bone it needs. Although it's not as strong as the Thunderdrum's persay.
  • Scary Impractical Armor: Zigzagged with the Boneknapper's shell of dragon bones, which seems to be quite practical and is intended mostly to be scary.
  • The Voiceless: Unless it has every bone it needs for its armor, Boneknappers can't roar.


Introduced: "How To Pick Your Dragon".
One of the two Tidal Class dragons known in the series, Thunderdrums are large, frog-like dragons who spend most of their time in the water.

  • Badass: It's able to dodge Toothless's plasma blasts, and Toothless fires several times faster than any other fire-breathing dragon. It is also said to get its power from Thor itself, but that is more of an exaggeration. It is also able to plow right through solid rock without a scratch in a manner reminiscent of the Red Death.
  • Early-Bird Cameo: Its first "appearance" is as a drawing in the Dragon Manual in the film. It isn't properly introduced until the show.
  • Flying Seafood Special: Its introduction has it switching from swimming expertly underwater to a flying Lightning Bruiser. The Other Wiki confirms that it is at least semi-amphibious.
  • Make Me Wanna Shout: It has a sonic scream, though its ability to scream someone's head clean off (as Hiccup narrated in the film) seems to have been an exaggeration, or not shown due to violence restrictions. It can, however, shatter reinforced wood and rock. This makes it one of the two dragons confirmed as not having fire-based breath weapons.
  • More Teeth than the Osmond Family: Its mouth is all fangs and its head is wide enough to hold Stoick the Vast comfortably.
  • Prehensile Tail: It uses its tail to grab Stoick and drag him under without leaving the water itself.

Fireworm Dragons

Introduced: "Portrait of Hiccup as a Buff Young Man".
Small Stoker Class dragons, Fireworms are lizard-sized and lizard-like dragons that rely on their fiery skin to shield them from bigger enemies. They swarm in large numbers. Their Queen, however, is massive and can breathe fire like regular dragons.


Introduced: "Dragon Flower".
A large Tidal Class dragon that lives almost entirely out to sea; it's unclear if it can even fly any more. Spends most of its time underwater and so is rarely a threat unless it takes a hankering to a netload of fish, or decides to get territorial around a ship.

  • Early-Bird Cameo: Its first "appearance" is as a drawing in the Dragon Manual in the film. It isn't properly introduced until the show.
  • Kill It with Water: As an aquatic dragon, its Breath Weapon is based on swallowing liters of water and heating them to boiling inside its belly, allowing it to spray targets with powerful geysers of searing water. As with the Thunderdrum above, the book embellishes this ability; the water may be hot, but it's certainly not as dangerous as the book would have one believe, given how easily the attack is blocked.
  • Poisonous Person: If it eats the right kind of flowers (which are deadly to other dragons), it becomes one of these. This also makes its venom a good cure for the poison in the flowers.

Whispering Death

Introduced: "What Flies Beneath".
A rare and deadly member of the Boulder Class, the Whispering Death is a subterranean species of dragon that uses its wide mouth, spike-covered sinuous body, and six rows of rotating teeth to bore through the ground and come up from below when pursuing prey.

  • Badass: The first one that appears is the Arch-Enemy Of Toothless and No Sells Thornado's sonic scream
  • Blank White Eyes: Though it isn't blind.
  • Dark Is Evil: The scariest looking dragon seen so far has also been the nastiest, with the first one harrassing the entire village of Berk, including eating several livestock, out of a feud with Toothless and the second one ending up as the mount of Alvin the Treacherous. However, his is shown to be subverted later in the series. When it's shown that there not all bad after all.
  • Everything's Better with Spinning: They have rotating jaws and their tails move in a circular motion while in flight.
  • Flying Seafood Special: Thematically invoked; despite being a mostly subterranean creature, the Whispering Death is still quite capable of flight.
  • Lean and Mean: They're the archetypal 'villain' dragons, with long, limbless, eel-like bodies.
  • More Teeth than the Osmond Family: Six rows of rotating teeth. Between this, their oversized, ball-like heads, and their hostility, they're basically a draconic Langolier.
  • Spike Shooter: Like the Deadly Nadder, only from virtually every point on its body.
  • Tunnel King: This is its signature ability and mode of travel.
  • Weakened by the Light: They retreat from direct sunlight, though even mild cloud cover is sufficient for them to go outside.

Smothering Smokebreath

Introduced: "Breakneck Bog"
Small Mystery Class dragons that dwell in isolated regions. They produce thick clouds of smoke and use this as camouflage.

  • The Collector: They collect any metal items encountered, which they then meld together to build their nests. Justified, as they're rather small in size and use those nests to protect themselves from attacks by larger dragons.
  • The Napoleon: Third shortest breed of dragons seen so far, they're also fiercely territorial and very aggressive. Hiccup and the others didn't even try to train these things!
  • Smoke Shield: Invoked. They make a foggy-like smoke to act as protection, combined with metal scraps, to appear larger and scare others off.
  • Pintsized Powerhouse: Surprisingly strong for little dragons too.
  • Zerg Rush: They attack swiftly and in great numbers in order to overwhelm (or at least scare off) their victims.


Introduced: "Gem of a Different Color"
A member of the Mystery Class of dragons, Changewings are best known for their chameleonic scales, which make them extremely difficult to find.

  • Constantly Curious: Stated to be their natural personality trait in Book of Dragons.
  • Face-Heel Turn: After the Outcasts tame and weaponise the local Changewing population. They're animals, so they're not inherently evil, but they're certainly being used for evil ends.
  • Hollywood Acid: Not as strong as in many examples of the trope (it can damage stone but can't go through it and it barely scratches metal bars) but the speed at which it melts wood is still uncanny.
  • Hypnotic Eyes: Demonstrated in Book of Dragons that it possesses this ability, though it hasn't used it yet in the series.
  • Invisibility: Can flawlessly blend in with their surroundings. However, in open skies they are unable to camouflage.
  • Mama Bear: Stealing their eggs is not a good idea. In fact, if multiple eggs are taken, ALL the mother dragons will work together to retrieve them, and they won't leave until they have them ALL back.
  • Squishy Wizard: For a dragon, anyways. The Gobber mentions in the Book of Dragons that their scales are softer as a side effect of their concealment, making them more vulnerable to attack once found.


Introduced: "Fright of Passage"

  • Arch-Enemy: To Astrid and her family.
  • Bioluminescence Is Cool: Its diet of glowing algae causes its entire body to glow with bright blue light. This extends to other dragons that eat the algae, but the effect would seem to be permanent (or at the very least quite long lasting) for the Flightmare.
  • Blinded by the Light: The Flightmare uses this as one of its abilities. As with its general bioluminescence, other dragons can copy the effect.
  • Fearis The Appropriate Response: Lampshaded by everyone in Berk. Subverted for the reason why.
  • Light Is Not Good: The Flightmare glows bright blue and attacks anything it feels is a threat to its food supply.
  • The Paralyzer: It sprays a mist that causes its victims to freeze up for about a minute, allowing it to eat them with impunity. As most people don't survive this effect, the villagers attributed it to the victims choking in fear at the last moment, a fact which shamed Astrid's family when her "fearless" uncle fell prey to it.
  • Super Spit: Its Breath Weapon. See The Paralyzer above.


Introduced: "View To A Skrill Part 1"
An elusive member of the Strike Class of dragons, the Skrill are known for their Electrical abilities.

  • Achilles' Heel: It cannot use its electricity when submerged underwater.
  • Ax-Crazy: According to the Book of Dragons, the Skrill is "Untrainable". Hiccup was willing to try, but he ultimately settled for just taking it out of the picture.
  • Badass: It's easily as strong as Toothless, in addition to being immune to his attacks. This dragon is in the same class as Toothless (Strike Class), which emphasize on being very destructive.
  • Beam Spam: Its Breath Weapon operates on this principle.
  • Early-Bird Cameo: Its first "appearance" is as a drawing in the Dragon Manual in the film (Hiccup even mentions its name). It isn't properly introduced until the show.
  • Harmless Freezing: Can survive decades frozen solid in a block of ice. Justified due to its efficient internal body temperature.
  • Lightning Gun: Its breath weapon. The Skrill breathes out concentrated beams of powerful electrical white fire.
  • No Sell: Its electrical field can block Toothless' plasma blasts, though it needs to recharge to keep it up.
  • Purple Is Powerful: One of two dragons that utilizes a Breath Weapon other than fire (the other being a Night Fury) and it's colored violet.
  • Ride The Lightning: ALWAYS lampshaded whenever this Dragon is mentioned.
  • Shock and Awe: Its main power.
  • Shoot the Bullet: Can nullify other dragons' attacks this way using its own Breath Weapon.
  • Spikes of Villainy: Is covered in spines.

Speed Stingers

Introduced: "Frozen"
A breed of raptor-like, flightless dragons.

  • Beware My Stinger Tail: Anything they sting gets paralyzed for the better part of a day.
  • Decapitated Army: The pack follows an alpha, and will follow it anywhere. The riders exploit this to get them off Berk by capturing the alpha and flying it away from the island.
  • Everything's Better with Dinosaurs: Lacking both flight and a Breath Weapon, they might as well be dinosaurs.
  • Fragile Speedster: They aren't very big or tall and look frail, but they are very, very fast.
  • Instant Sedation: Their poison takes effect instantly.
  • Law of Chromatic Superiority: The alpha has a red crest.
  • Nothing Is Scarier: There is absolutely no information on them in their research notes.
  • The Paralyzer: Their stingers are essentially the Flightmare's spraying mist on steroids.
  • Pint-Sized Powerhouse: Their leader in particular, who breaks free of Hiccup's bola like it was nothing and just yanks Hiccup's shield off his arm with his tail.
  • Raptor Attack: With their super speed and pack hunting, they act like dragon raptors.
  • Super Speed: To make up for the fact that they can't fly.
  • Zerg Rush: They attack in one massive pack, using their stingers to quickly eliminate any threats before making off with any food they can find.