Kingdom Hearts AU

Kingdom Hearts AU (also known as KH AU) is an AU (Alternate Universe) within the Rise of the Brave Tangled Dragons fandom. In the AU, Rapunzel, Merida, Hiccup and Jack Frost are placed into the expansive universe from the Square Enix video-game franchise Kingdom Hearts. Because it is not canon, ideas for this AU are shown through fanfiction, fanart, and other fan-made works. This AU is considered an offshoot of Fairy Tale AU.

About the AU
Spawned from fanart, this AU places the Big Four within the Kingdom Hearts Universe, each inhabiting their own world within this universe and meeting Sora, Donald and Goofy through such circumstances.

How they meet one another differs between interpretations, either having their own fantastical journeys in their worlds (adding in elements from the video game's main characters, the Heartless, the Nobodies, et cetera) or meeting each other through circumstances in congregating hub-worlds like Traverse Town or Hollow Bastion/Radiant Garden. In other circumstances, each of the characters gather together and become the main characters in their own stories, even being the wielders of their own keyblades.

Because the Kingdom Hearts franchise uses excessive elements from popular Disney stories, the likelihood of Rapunzel, Merida, Elsa, Anna, et cetera existing in the Kingdom Hearts universe is very likely