Assassin's Creed AU is a fairly new AU within the Rise of the Brave Tangled Dragons fandom. In this AU, the Big Four, and other associated characters, are members of the Assassins Order, an organization from the Assassin's Creed video game franchise. This AU can be considered as a sub-scenario of Arcade AU.
About the AUEdit
Spawned from from fanart, this AU takes the rich mythology of Assassin's Creed and makes the Big Four members of the Brotherhood of Assassins, an organization that wishes to encourage free will, fundementally opposing the Templars, who wishes to save humanity from itself by taking away free will.
Because Assassin's Creed 4 takes place in a pirate-setting, fans like to consider this AU an alternative to Pirate AU; while Syndicate takes place in Victorian London and Chronicles: China in Ancient China.
The Big FourEdit
Because Hiccup holds up a position for the betterment of mankind in a manner seen as bad to the general public, Hiccup is most commonly portrayed as an Assassin. In some circumstances, he becomes a member after he leaves Berk with Toothless after winning the chance to kill Hookfang either before or after his secret is revealed. The Dragon Eye and its lenses can be portrayed as a Piece of Eden (like the Crystal Skull), to help Hiccup find others or show him how they work and are made.
Jack would be a bit hesitant to join the Assassins at first, though he would help them against Pitch Black and later join their ranks.
Because of her high value on freedom, Merida is most commonly portrayed as an Assassin. She is usually portrayed as an archer.
Rapunzel may not have the heart of a killer, but she can still help and be a member of the brotherhood by being their healer or librarian as she digs up knowledge and information of the First Civilization and their Pieces of Eden. Where they are, what they do and what would happen if they fall into the wrong hands.
Because Pitch's actions impede the progress of mankind - spreading fear and impeding the light within others for his own personal gain - as well as holding an antagonistic position to the Big Four, Pitch is most often portrayed as a Templar, even as a high-ranking member to the Knights Templar. In other circumstances, because of his longevity, mysterious stature and his origins amongst a celestial civilization, Pitch is often seen as a malevolent member of the First Civilization.
The team are a group of modern day Assassins (from Japan) with their own unique stills and "toys" that they use to kill Templars, stay alive and hack into Abstergo. They also fire up the Animus to find Pieces of Eden from the eyes of their predecessors and to awaken their assassin ancestors' skills.
Heather's past and clothing in Race to the Edge makes her a revenge seeking Assassin, as she kills the Templars on the brotherhood's list and those who wronged her adopted family and the assassin village that raised her. After falling upon her brother, she learns that she comes from a family of Templars; her birth father left her to be raised by her adopted family so she could become an assassin and undo his Templar deeds.
The Guardians are seen as high ranking members of the Assassin Brotherhood, along with being Jack's teachers as they teach him the creed and the ways of the brotherhood. They can also be malevolent members of the First Civilization. Their G crest is sometimes placed in the center of the Brotherhood's emblem.
Because of their clothing and goal to defend dragons from those that would wish them harm, they are seen as Assassins. With the Queen Mala and Throk as two of the high ranking members of the Assassin Brotherhood and the Dragon Hunters as the Templars that they are tasked to fight and kill.
Anna is mostly seen as a Assassin that joined the Brotherhood so she could protect her older sister. Mostly because she had learned that Hans and the Duke of Weselton are Templars that what to take control of Arendelle, by manipulating the Queen and killing her should she uncover their plans, and when they have no longer use of her.