Mortal Instruments AU

Mortal Instruments AU (also known as The Shadowhunter Chronicles AU) is a relatively unknown but still well-loved AU (Alternate Universe) within the world of Cassandra Clare's The Mortal Instruments and the Shadowhunters TV Series . 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. This can be considered an offshoot to Angel AU and Modern AU.

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

Featured Characters
Often in this AU, the Big Four are Shadowhunters, beings of aments power and placed in one of the many hunting families. 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 was orphaned at a young age because of the demons that killed his family, that's why he joined the surviving members of his Shadowhunter family, so he could avenge and prevent it from happening to other Nephilim and Mundane families.

Fans also see him as Jace.

Merida DunBroch
Merida hunts down demons with her bow and arrows.

Rapunzel Corona
Rapunzel is cast between a hunter and healer.

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

Nightmares
Pitch's Nightmares are the demons that shadowhunters hunt and kill to protect mankind.

Guardians
The guardians are like the Nephilim. They keep the children of the would safe from those who wish to harm them (like how the hunters keep mankind safe from monsters) and can only be seen by people that believe in them.

Fanfiction

 * Guardians and Shadowhunters by dontletthenarglessneakuponyou