Dramatical Murder AU

Dramatical Murder 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 are characters featured in the game, manga and Animated series of Dramatical Murder. This could also be a sub-scenario for Arcade AU.

Hiccup Horrendous Haddock III
Fans have cast Hiccup as the main protagonist of the Dramatical Murder series, Aoba Seragaki.

Toothless
When Hiccup is Aoba, Toothless is portrayed as his pet dog, Ren.