Hiccthur

Hiccthur is the poly ship between Hiccup Horrendous Haddock III, Dagur the Deranged and Heather from the How to Train Your Dragon fandom.

Season One
Sometime after Hiccup saves Heather from Dagur, she tells him about what she remembers of her birth father before ended up in the care of her adoptive family; who have been killed by Dagur and his forces. Which is why Heather has been hunting Dagur down so she could avenge them, along with the lives of her fellow villagers. As Heather told Hiccup this, she had showed him the horn that was a gift from her birth father; but when Hiccup got a closer look at it he saw that his father's chief seal is craved on it. Putting two and two together in his head, Hiccup flies back to Berk so he could hopefully have Stoick conform his suspicion of Heather being his sister. Stoick explains that while the horn is a gift from him to Heather, however, it wasn't because he is Heather's father but to simply honour the tradition of presenting a fellow chief's new born child with a gift; along with the fact that the said chief was Oswald the Agreeable.

Realizing that Heather is Oswald's daughter and Dagur's younger sister, the one that she seeks vengeance on, Hiccup races back to the Edge to tell her this before she does anything that she'll later regret. While Hiccup is able to stop Heather from killing her brother, just before telling her of what he had learned about the origins behind her horn, she is horrified to know that she shares blood with the one who killed her adoptive family.

Moments

 * Dagur calls Hiccup their brother in his letter to Heather.
 * Before Hiccup and Heather go to help Dagur, Hiccup calls him their brother.

Fanon
Because of Dagur countlessly calling and referencing Hiccup as "his brother", along with Hiccup's question to Stoick about Heather being his "sister", due to him finding his father's chief seal on Heather's horn, just before it was reviled that she is in fact Dagur's long lost sister, a few fans began to wonder what it would have been like if all three of them are siblings; with Hiccup and Heather as twins while Dagur is their older brother. Since all three of them have green colored eyes and are shown to be "deadly" when their anger is pushed to the limit, some fanon alterations of this How to Train Your Dragon "what if", however, doesn't always have Hiccup and Heather related to Dagur at all. As well as the reason why the poly ship is sometimes treated as a familyship.

Fandom
FAN FICTION