Miraculous Ladybug AU

Miraculous Ladybug AU (also known as Miraculous 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 hit Korean-French animated series Miraculous Ladybug. This can be considered a sub-scenario of Superhero AU.

About the AU
In this AU, the members of the Big Four are portrayed as characters from Miraculous Ladybug, most commonly as the two animal-themed superheroes: Ladybug/Marinette Dupain-Cheng and Cat Noir/Adrien Agreste.

The four and other such characters can also be bearers of their own Miraculouses, or even as Akumatized Supervillains, people who are turned evil and embued with powers by the weilder of the Butterfly Miraculous.

Hiccup Horrendous Haddock III
With Hiccup's leadership and coming up with ways to get himself and his friends out of sticky situations casts him as a male Ladybug (for the Hijack pairing). Fans have also cast him as Cat Noir or given him his own Miraculous so he can transform himself into a Dragon-based Superhero, with the help of Toothless as his Kwami and his sword or shield as his main weapon.

Jack Frost
Due to his sly attitude, Jack Frost is most commonly played as the cat-based superhero Cat Noir. Brown hair for when he is Adrien Agreste and white hair when he has his "Claws Out" and mask on.

On the other hand, Jack could be portrayed as an Akumatized Villain, his wish to be noticed in a world that sees him invisible attractign Hawk Moth (or whatever variant is present in the story) to corrupt him not unlike Juleka, embuing him with power over wind and ice. The akuma would most likely be contained within his staff, the staff being his main conductor in-canon.

Merida DunBroch
In some circumstances, Merida is portrayed as a Bear-themed Superhero, her family's necklace being the miraculous used, her main weapon being her bow or a sword.

On the flip side, Merida would be portrayed as an Akumatized Villain. The family quarrel she suffers from at the hands of her mother combined with her temper would attract hawk Moth (or whatever fill-in character there is) and turn her into a bow-weilding villain out to enact vengeance and rebellion on the unwitting city. Usually, the akuma would be hiding within her family necklace.

Rapunzel Corona
Rapunzel is portrayed as Marinette Dupain-Cheng/Ladybug or given her own Miraculous by fans, sometimes portraying with a Chameleon or Horse-themed superhero in homage to Pascal and Maximus respectively.

In lesser circumstances, Rapunzel could play the part of an Akumatized Villain, her yearning to be free of her mother's influence and being denied her wishes leading to her becoming akumatized.

Elsa of Arendelle
Elsa is most commonly portrayed as either Ladybug (should Jack Frost be Cat Noir) or as Cat Noir (given her bright blonde hair and aristocratic upbringing).

In other circumstances, Elsa would become an Akumatized Villain, the the fear and isolation she experiences as well as her yearning to be with her sister turning her into an ice-weilding villain that plunges the city into an instant winter.

Hiro Hamada
Hiro is cast as a male Ladybug for the Hidashi pairing and Cat Noir for Penniro.

In other circumstances, Hiro could become an Akumatized Villain, the grief he experiences after Tadashi's death attracting an akuma and turning him into a bionic supervillain out to destroy whoever thinks was responsible.

Tadashi Hamada
Tadashi is most commonly casted as either a male Ladybug or as Cat Noir. In other cases, Tadashi could be portrayed as a Fox-themed Superhero through the Fox Miraculous, based off of the "Kitsune" identity he takes most commonly in Dark AU.

In other cases, Tadashi would take on this very same persona as an Akumatized Villain, out to kill Callaghan or whoever else he believed was responsible for his near death.

Pitch Black
Pitch can be cast as Hawk Moth or given his own Miraculous (the animal theme in the form of a horse) that has the same powers and abilities as the Butterfly Miraculous. Using his nightmares to Akumatize innocent people as they turn into super villains, preying on their fears and insecurities.

The Man in the Moon
Like how Master Fu entrusted the Ladybug and Cat Miraculouses to Marinette and Adrien and MiM chose the Guardians to watch over the children of the world: MiM is cast as the "Keeper" of the Miraculouses, as he hands (four of) them down to the Big Four and keeps (the rest of) them out of the hands of evil (until he can find bearers for them). He can also be a bearer of a Glowworm or Lunar Moth Miraculous (since he was raised by the ones that were on the Moon Clipper when he was a child).