Kung Fu Panda AU

Kung Fu Panda AU is a AU (Alternate Universe) within the Rise of the Brave Tangled Dragons fandom. In the AU, Hiccup, Merida, Rapunzel and Jack Frost are portrayed as characters or placed in the world of Kung Fu Panda. This can be considered a sub-scenario of Dragon Warriors AU.

About this AU
Spawning from fanart, this AU places the Big Four, and other such characters in the fandom, as the animals living or training in the art of Kung Fu, so they can protect the Valley of Peace or portrayed as "humanized" characters from the film.

Hiccup Horrendous Haddock III
Hiccup is cast between (a humanized) Crane and a finer, smarter Po; when Astrid and the other members of the Berk Dragon Training Academy are the Furious Five. The Dragon Manual or the (cover of the) Dragon Eye can serve as the Dragon Scroll.

Merida DunBroch
Merida is commonly portrayed as Tigress.

Astrid Hofferson
Being top of her class, deadly, skilled and was believed to be the one that be given the honor to kill a dragon, in Dragon (Killing) Training, before the "honor" was given to someone else, casts her as a (humanized) Tigress.

The four other young, Vikings - Fishlegs, Snotlout, Ruffnut and Tuffnut - can also be cast as the other members of the Furious Five - Crane, Mantis, Viper and Monkey - ; with Hiccup as the Dragon Warrior, Po.

The Guardians
The Guardians are sometimes seen as or minoring the Furious Five, with MiM as Grand Master Oogway, Master Shifu or the one that taught them the mays of Kung Fu; so the Guardians can use those skills to protect the valley and those in need.

North's strong, bulk body makes him a strong, skilled panda. Bunnymund stays a rabbit, but instead of being one of the "villager bunnies", he is a deadly, fast, skilled rabbit of Kung Fu. Tooth is a fast, strong beck hummingbird that is trained to fight opponents that are bigger than her. Sandy is a red panda that is "silent" and deadly. Jack is a snow leopard and the newest and youngest member of the protectors; MiM called him to the dojo so he can train him to take on the Black Peacock, Pitch (when he is the evil peacock, Lord Shen); like how Po needed to be trained with food, Jack is needs to have "fun" while training.