Princess Mononoke AU

Princess Mononoke 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 play roles from Princess Mononoke. This can be considered an offshoot to Studio Ghibli AU.

Hiccup Horrendous Haddock III
Between Astrid and Merida as Mononoke, Hiccup is cast the Prince Ashitaka. He leaves home (which he can not return to) with his Red Elk, Yakul (as Toothless) so he could lift the curse (that is slowly killing) and uncover the evil that gave birth to demon that attacked and cursed him; and  'to see with eyes unclouded by hate' .

Jack Frost
For Jarida he's cast Ashitaka (with brown hair) as he falls in love with the Bear Princess while trying to bring peace man, the forest and it's spirits.

Merida DunBroch
Merida is portrayed as the wolf/bear princess Mononoke (also known as San). As she and her bear mother and brothers fight to drive the humans away and kill the 'evil woman' that command them to destroy their forest for iron and killed half of their pack and other innocent animals.

Hamish, Hubert and Harris
The brother and their mother are portrayed as Merida bear family, but older so their sister could ride on one of they're back's. While Elinor is the bear goddess Moro.

Astrid Hofferson
Fans have cast Astrid as San, but as a princess of Dragons and her racing paint as war paint.

Elsa Arendelle
Elsa as Mononoke is (by fans) the protector of the North Mountain with her reindeer brother(s).