Dagur

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 be 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 also was 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. But behind his insane and sadistic nature, he still has good in him. Dagur is understandably very fond of his sister, and helped her numerous times. Most ironically, he even dared to go against Viggo's orders to rescue Heather, who was sentenced to death, even though she was siding with the riders. Later, Dagur was willing to sacrifice himself to save the riders from potential death. As displayed in various events after his reformation, Dagur actually prioritizes family before anything else. He is fiercely protective of Heather, to the point of threatening Ryker not to harm his sister and often reinforcing their bond by saying things like, "Nothing like a family rift, eh, sister?" in "Maces and Talons, Part 1". He also willingly broke out and seemingly sacrificed his life