Viking AU

Viking AU (also known as Dragon Rider AU depending on the story) is an AU (Alternate Universe) within the Rise of the Brave Tangled Dragons universe and the Rise of the Brave Tangled Frozen Dragons universe. In the AU, Rapunzel, Merida, Hiccup and Jack Frost are all portrayed as vikings. Because it is not canon, ideas for this AU are shown through fanfiction, fanart, and other fan-made works.

About this AU
In this AU, the big four are portrayed as Vikings. Because Hiccup - one of the original members of the Big Four - is in fact a viking, this AU usually involves itself within the plot of the How to Train Your Dragon series, setting the characters as members of the vikings of Berk or at least from tribes somewhere in the Barbaric Archipelago, though this is not required. Some may also use the setting and time of History's Vikings for inspiration.

Hiccup Horrendous Haddock III
Because he is already a viking, Hiccup most commonly plays himself (much in the same way that Jack Frost plays himself in the Seasons Guardians AU), acting as future/current chief of the Hairy Hooligans and leader of the Dragon Training Academy.

Jack Frost
In some scenarios, Jack usually portrays a viking incarnation of his original human self as either a Dragon Killer-in-Training or as a Shepherd given his crook. Should he be a Dragon Rider, people most often portray him paired with either an adolescent Bewilderbeast or a Snow Wraith given their association with ice and winter. Sometimes this incarnation of Jack dies in the same way that he does in the film, becoming Jack Frost after saving his sister.

In other circumstances, Jack is portrayed as the old nordic legend Jokul Frosti, providing a mythical angle to the overall story.

Merida DunBroch
Due to her masculine, tomboyish attitude, Merida is most often portrayed as a Shieldmaiden in the same vein as Astrid. Should she be a Dragon Rider, Merida is usually either paired with a Deadly Nadder (given her similarities to Astrid), a Scauldron (given its similarities to the fabled Loch Ness Monster) or any other dragon currently unused by the dragon training academy.

Merida is sometimes portrayed as a Dragon Trapper and a member of Eret's crew for the Meret pairing.

Rapunzel Corona
Rapunzel's role in this AU is one of the trickier, as the role of women in traditional viking society was notably narrow. Should she be a citizen of Berk, she would most likely be a Shieldmaiden (though far less militant in her title as Astrid or Merida would be), her magic hair being a blessing from the gods that they worship.

Te Fiti
Being an island goddess can easily make and cast her as the Norse Earth goddess, Jord. While her Te Kā form makes her a Fire Giant, an enemy of the Viking gods.

Queen Elsa
Elsa is mostly seen as a Shieldmaiden that was cured or had her ice powers given to her by the Viking God, Loki. Her royal states also makes her a chief of her own Viking tribe in the North and on an icy, cold island.

As a Dragon Rider, her dragon would most likely be a Snow Wraith, a Bewilderbeast or any other dragon that breath ice or live in icy habitats.