Elements AU

Elements AU is a popular AU (Alternate Universe) within the Rise of the Brave Tangled Dragons fandom. In the AU, Rapunzel, Merida, Hiccup and Jack Frost are all part of the Avatar: The Last Airbender world, and often are elemental benders. Because it is not canon, ideas for this AU are shown through fanfiction, fanart, and other fan-made works.

About the AU
The Big Four also have dubbed elements. Merida being fire, Jack being ice, Hiccup being earth, and Rapunzel being air. Normally, the elements portray to the Avatar: The Last Airbender TV series. Usually in some drawing and fanfictions, people even clothe them as they would look in the series as well. Like Aang has Appa and Momo, usually the character's pets are portrayed as their guide companions.

Fanfiction
Together Foreverby Little.StarBabe

Fanart
Other elemental AUs A recent audio drama on Tumblr, FOURdisplays the group slightly differently, Hiccup is still earth, but Jack, Merida and Rapunzel have been changed.
 * Jack has been linked to air, he works and travels with it with ease.
 * Merida represents water, it is flowing and free.
 * Rapunzel has a connection with fire, though her personality may not be as wild she is connected to the sun, and heat.