The Secret World of Arrietty AU

The Secret World of Arrietty AU (also known as Borrowers 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 The Secret World of Arrietty and are portrayed as Borrowers. This can be considered an offshoot to Studio Ghibli AU, Leafmen AU and Fairy Tale AU.

About this AU
In this AU the four are little people known as borrowers (they're like Leafmen, but a 'little' bit bigger), people that borrow small (and unmissed) house hold items to make their home (under the floor boards or in people's gardens) while keeping themselves unseen. The four and other characters can also be friends with borrowers as they keep them a secret from their family, sneak them small food like sugar cubs and other items that they may need.

The four can also be cast in Hayao Miyazaki's animated film Arrietty (a short nickname of the full title) or Mary Norton's book, The Borrowers.

Hiccup Horrendous Haddock III
Hiccup is a house borrower that uses a 'borrowed' paperclip to replace his missing leg and comes up with new ways to get around the house. Hiccup can also be portrayed as Spiller.

Jack Frost
For Jackunzel he's cast as Sho, a young sick 12-year-old boy that uncovers the 'little people' from his mother's stories. Jack can also be cast as a borrower and a male Arrietty.

Merida DunBroch
Merida is cast between a normal human (that's helps her small friends from time to time) and a borrower that lives and borrow items from people's gardens (like plants) or town streets, like Spiller.

Rapunzel Corona
For Jackunzel Rapunzel is portrayed as the young (and just started) borrower, Arrietty as she grows close to the human boy that saw and kept her a secret from his family. She can also be friends with borrowers that are living in her tower

Astrid Hofferson
Fans have cast Astrid as Arrietty, with Hiccup as Sho.

The Guardians
The Guardians are borrowers and Jack's family, they help him improve his skills and make sure that his 'exploring' doesn't get him seen.

Jamie Bennett
Jamie notices the missing items and tries to find them and the 'one(s)' that took them with the help of his sister.

Tinker Bell
Tinker Bell and her friends are like borrowers with wings, while Lost Things are like the borrowed items. Tink (as Arrietty), Fairy Mary, Clank and Bobble are house borrowers living in Lizzy and Martin Griffiths' house. While Terence (as Spiller), Zarina and the rest (some) of the fairies are borrowers living on town streets or in people's gardens.