Mortal Instruments AU

Mortal Instruments AU (also known as The Shadowhunter Chronicles AU) is a a relatively unknown but still well-loved AU (Alternate Universe) within the world of Cassandra Clare's The Mortal Instruments. In the AU, Rapunzel, Merida, Hiccup and Jack Frost are Demon-Hunters known as Shadowhunters or Nephilim. Because it is not canon, ideas for this AU are shown through fanfiction, fanart, and other fan-made works.

About the AU
For those who don't know the Mortal Instruments series, Shadowhunters (that are half angel and half men) hunt down demons and their offsprings, the warlocks, faeries, werewolves and the vampires that hid in human form and cannot be seen by mundane (mortal human).

Featured Characters
Often in this AU, the Big Four are Shadowhunters, beings of aments power and that resides in the "institute", the place where the New York shadow hunters live. However, some fans place the Big Four as roles of the characters, such as Jack being Jace. Below are the lineages the Big Four are commonly placed in:

Jack Frost
Jack is portrayed as Jace, a Shadowhunter orphaned at a young age because of his father's murder.

Rapunzel Corona
Fans see Rapunzel as Clary, the daughter of a former shadowhunter and has her whole world turn upside by witnessing shadowhunters killing a demon.

Fanfiction

 * Guardians and Shadowhunters by dontletthenarglessneakuponyou