Dagur the Deranged

Dagur has red hair and dark green eyes. He is rather skinny for a Viking, which is probably because he is young. He has been shown to tower over most of the teens in Berk nonetheless. He has two tattoos of three lines like claw marks, one across his left eye and the other on his upper right arm. In the first two seasons, Dagur's hair is pulled back in a braid, with a helmet that covers most of his head, and long horns on it. Under it he wears a black headband. He has a brown, short-sleeve shirt and a tan tunic with green metal studs. His left arm is covered in green bindings, with a large one on his forearm and a spiky elbow pad, and his right arm has only a leather strap. He has metal shoulder and knee pads, and a large, gold belt buckle with his crest, a Skrill, on it. Dagur wears tan pants and pale green boots with brown bands. He also has a black, studded belt he wears over his left shoulder, which he uses to carry his sword.

His former title of Dagur the Deranged was actually quite fitting for him, as he was seen as violent and extremely unstable. When he laughed, at least initially, his smile changed to a frown after a while. At times, he performs erratic acts without thought or reason, other than to shed blood and kill. This impulsiveness made him unpredictable at times. He may have been hyperactive as well as insane. He was especially eager to kill dragons and saw them as nothing more than targets for his sadistic sense of pleasure. It is shown that while Dagur prided himself as a dragon killer, he has little regard for the sport, having brought his entire armada to assist him on his hunt for Toothless. He also had an enormous ego, was very rude, and disrespectful. He was also very vengeful. He also showed a lack of respect for those who were peaceful in his debut. Also, he is shown to have a sense of humor, such as when he meets Hiccup again in "Family on the Edge" and says, "Hiccup! Where's my hug?" and when he calls Hiccup small and cuddly. He also seems to be a hypocrite, as whenever Snotlout called him "Dagster," he would tell him he hates nicknames, despite having called Snotlout various insulting nicknames.

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Dagur is an accomplished fighter and has shown to be able to hold his own against Alvin the Treacherous, though he isn't above using unfair means in order to win. He also was able to control a Skrill by harnessing it and controlling it with ropes. He has better fighting skills than many adult Vikings, such as Savage, despite the fact that he is young. He has been working out for the past three years, as his muscles are shown to be a lot bigger and he has grown much stronger as he can incapacitate Outcasts, Berserkers, and Dragon Hunters with one punch. Even before he was able to throw daggers at pin-point accuracy as shown in "Twinsanity", "The Night and the Fury", "A View to a Skrill, Part 1", "Enemy of My Enemy", and "Family on the Edge".

As a Berserker, Dagur tends to act savagely, even outside of battle. He enjoys violence of any kind and will even attack his own men. After being imprisoned for three years, these tendencies had intensified. It is possible he actually possesses Berserker abilities, this can be seen when Dagur requests Hiccup to howl with him, like a wolf (úlfheðnar) in "The Night and the Fury", and in their battle near the end he fought like an animal and acted savagely.

Despite claiming that he hates strategy, Dagur is surprisingly clever. He managed to lure Hiccup to Outcast Island by letting his soldiers tell Trader Johann false information about some kind of weapon that will use against the Riders of Berk in "The Flight Stuff". He also used Trader Johann to bring the Smothering Smokebreath nest to Berk in "Smoke Gets in Your Eyes" so the dragons would steal Berk's weapons, making them vulnerable to an invasion. He also figured out the effect Dragon Root has on wild Dragons, and used this information to get the dragons and their Riders trapped in the academy so he could trade with Hiccup for his dragon to save his friends. This plan was unsuccessful, so he made up for it by capturing Stoick in "Cast Out, Part 1" instead, to make another trade. His intelligence also allows him to gain the upper hand in battle, like in "Team Astrid" he knew that his hit and run attack on Berk would get Hiccup and his Riders out in the open trying to find his fleet. He used that against them and had his men map the trajectory of their movements, thus allowing him to find their secret hideout on Dragon's Edge and lay siege to their base until Hiccup sent a message back to Berk for reinforcements, which forced Dagur into retreat.

Dagur has proven in fights against Alvin the Treacherous and several wild Dragons that he is a very fast and agile warrior.

Daguar has incredible reflexes as he reacted to dodging enemies blows, as he dodge Alvin's sword during their duel. He also once caught an arrow while riding Toothless in "Enemy of My Enemy".

Unlike the Outcasts, Dagur's soldiers appear to follow him out of respect and not fear. However, just like Alvin, his men wouldn't dream of not obeying their leader. The Outcasts join the Berserkers after Dagur supposedly kills Alvin in "A View to a Skrill, Part 2". However, he was still their leader three years later when he escaped from jail. Even after his reformation, he remains the leader of the Berserker tribe.

He seemed to enjoy killing dragons. At first, he saw Barf and Belch and was very eager to capture the dragon to slice their heads off but it failed when he saw the dragon attack. As he saw trained dragons that were attacking in the Kill Ring, he was shown to be afraid mostly when he saw the Night Fury and Monstrous Nightmare. But on Dragon Island, he was training for possibly weeks or months to kill dragons and study their abilities. He was able to kill a few dragons, including a Monstrous Nightmare, proven by the dragon's skeleton. He gave up this skill, due to his reformation.

Dagur was able to control the Skrill very well, using the creature like a puppet. Dagur was able to make his Skrill attack everything. However, Hiccup managed to trick Dagur into standing in water as the Skrill attacked, electrocuting the Berserker, who then lost his Skrill in the ensuing chaos.

His body is very muscular as he able to endure attacks from other Vikings and continue to fight. He even endures getting shot with an arrow in his shoulder and is later shown to have recovered as he was able to fight once more after the treatment he got from Hiccup. His stamina is very high due to all of the training he has done over the years.

Though very briefly, Dagur showed some signs of being a great dragon rider. His first ride on Toothless was difficult for him at first, although he did improve on the second time. He quickly earned the trust of Shattermaster, his first dragon, who became protective of him, even though they had only been together for one day. He proven to be fast learner according to Fishlegs as he was able to train Shattermaster very fast during the short time they have been together. He was also able to pick up other skills used by dragon riders during his isolation, like emitting a call to ward off Changewings. He even rode on the Triple Stryke for saving his life.

Dagur appears to have artistic talent, as seen on the cave wall drawings seen in "Enemy of My Enemy." It is unknown if he had any formal art training. However, his father, Oswald, also seems to be rather talented with sketches, as seen in "Searching for Oswald... and Chicken. " It appears he inherited the artistic ability from his father, Oswald, the Agreeable.

Aside from his absolute insanity, Dagur has an overwhelming sense of pride that prevents him from thinking clearly at times. He tends to be reckless and impulsive and charge headlong into fights where his opponents outsmart him. One such example is Hiccup challenging Dagur to a one-on-one battle between them and their dragons, despite Dagur's overwhelming advantage in numbers. His pride and impulsive nature also make him quite stupid, as he believes that Toothless will just respect him and let him ride without putting up any kind of fight. He also did not question Tuffnut's claim to be a Berserker. However, Dagur slowly began to overcome these weaknesses later on as he turned away from evil, gaining a good semblance of sanity and learning to let go of his pride. Dagur also tends to lean away from strategy, relying on brute force and harsh attacks to take down a target. He has been seen charging at enemies without regard to his own safety several times. This makes him relatively easy to defeat. Eventually, Dagur overcame this weakness, too.

Heather is actually Dagur's long lost younger sister. He first mentioned that he had a sister in "The Night and the Fury", who had a shield like Hiccup's. For unknown reasons, Dagur attacked her village and killed her foster family, thus motivating her revenge. Then in "Have Dragon Will Travel, Part 1", he reunited with Heather, who did not know her true connection to Dagur. When he nearly captured her, he told his men he wanted her alive. After Heather learned the truth that Dagur was her brother, he offered her to join him, but she refused. It should be noted that Heather is on his revenge list, though the reason for this is unclear.

Hiccup and Dagur have known each other for a long time, usually meeting with their tribes' treaty signing. Dagur often bullied Hiccup, using him as a knife-throwing target or trying to drown him. Hiccup describes him as a "lunatic kid" and is not happy to learn that he is the new chief of the Berserker Tribe. Dagur confronts Hiccup about the Red Death and dragon training rumors he has heard, only for Hiccup to deny them. The dragon trainers stage a dragon attack to save Barf and Belch, and the Berserkers retreat, telling the Hooligans to consider the treaty signed. After losing the symbol of his people, the Skrill, to Hiccup and Toothless, Dagur's pride was badly hurt, making him even more determined to capture the rider and his dragon. Dagur also tried to make Hiccup choose to give Toothless up for the sake of his loved ones, such as the Dragon Riders and Stoick. Before he left, Dagur had written a note for Heather, expecting he would not survive the attack, apologizing to her for what he had done, and that he couldn't risk her life by facing the fleet. He tells about Viggo's dragon auctions, as well as the true fate of their father. Dagur now concludes with him wishing Heather to be safe, proving he had wanted to change and that he really did care about her. Dagur is also very protective over Heather and always wants her safe.