Celtic AU

Celtic AU (also known as Highland AU and Brave AU) 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 people living in the Scottish Highlands. 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 Scots, Celtics and Archers from the Highlands. Because Merida - one of the original members of the big four - is a princess of highlands, this AU usually involves itself within the plot and settings from Brave, setting the characters as people from the Kingdom of DunBroch, being cast as or mirroring the roles from the film, though this is not required.

Merida DunBroch
Because she is already a scot, Merida most commonly plays herself (much in the same way that Hiccup plays himself in the Viking AU), acting as future queen of DunBroch and master archer that passes her skills to her friends. But some fans have cast her as a Celtic Warrior or Princess, defending her land from the Romans.

Rapunzel Corona
Rapunzel is portrayed as the princess and upcoming queen of the highlands or of her own clan. But as the kind of "lady" that Elinor wants her daughter to be.

Hiccup Horrendous Haddock III
Both Stoick and Valka have Scottish accents, meaning that Hiccup is part Scottish or had ancestors living in the highlands before they moved to the Archipelago. Hiccup can also be the hair to the highlands or of his own clan, making him one of Merida's suitors or cast as a Scottish Blacksmith.

Jack Frost
Jack's crock like staff makes him a Shepherd, taking care of sheep or highland actual with his sister, as his original human self. He is also portrayed as a young scot wearing a blue kilt and trying to get the princess's attention.