Digimon AU

Digimon 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 Digimon.

About the AU
In this AU, the members of the Big Four are portrayed as "DigiDestined" or "Digimon Tamers", children that are partnered with digimon - or "digital monsters" - to empower them to fight off other digimon.

Hiccup Horrendous Haddock III
Hiccup is usully portrayed as a DigiDestined/Digimon Tamer. Being a natural-born leader in-canon, Hiccup is usually portrayed as the leader of the group, complete with goggles to fit with the recurring motifs digimon leaders possess.

Toothless is usually portrayed as his digimon partner Toothlessmon, his various levels resembling a cyborg/dragon-esq motif. This further cements Hiccup's position as leader, as many of the series' leaders possess dinosaur-like digimon as partners, many of their digivolved forms possessing cyborg qualities.

Jack Frost
With his history, Jack is a lone DigiDestined/Digimon Tamer (that has been one the longest) that bumps into the group a few times before he and his digital partner finally join them. Jack's partner can be an Ice Digimon (like Frigimon or Sorcermon) or one that likes to have fun and play tricks. With Baby Tooth as a Piximon, that travels, helps the two out in their battles and feels safer at Jack's side.

Merida DunBroch
Merida is the serious one among the DigiDestened/Digimon Tamers, that acts like the second in-command with the support of her partner. Merida's Digimon can be skilled at archery or bear like (like Bearmon) to resemble her mother or brothers.

Rapunzel Corona
Rapunzel acts as the shy and dose her best to keep the team together when things look dark and down. Her digital-monster can be between plant like (like Floramon or Lalamon), has powers over the sun and light or Pascal as Pascalmon.

Big Hero 6
Like the original DigiDestined the team are portrayed as DigiDestineds from Japan. With original (real) Digimon or Fakemon (fanmade Digimon) that are based on their armor, as they keep San Fransokyo safe, travel or trying to find their way home from the Digital World. Given the heavy use of science-fiction and darker themes, the Big Hero Six would resemble the team from the third season the most.

The Man in the Moon
MiM helps the chosen children and their digital partners as they fight to free the Digital World that he watches over, much like Gennai and Ophanimon.

Pitch Black
Pitch is portrayed as the "Dark Lord" virus-attribute Digimon that unleashes chaos across the Digital World and sends dark, powerful or controlled Digimon to get rid of the chosen children that were sent to stop him. Much like Devimon and his black gears and the Digimon Emperor and his control spires, Pitch Black would influence other digimon through the use of his Nightmares.

In other cases, Pitch would act as the corrupt human-companion to a malevolent digimon or a government agent that meddles with the affairs of the main heroes.

Fanfiction

 * Digimon Hero 6 Chapter 1 by Aileen-Rose