When Harry conquers death and gains the deathly hollows he becomes the personification of one of the Holidays, Hallows Eve and Halloween. Otherwise known as Samhain. It's his job to monitor the monsters of the world, as well as oversee the boundary between the mortle and immortal realm.

Required:

Slightly Insane Harry

Voodoo, Ritual, etc... Otherwise, uncommonly seen magic in fanfic

Not romance centered

Badass Harry

Suggested:

Army of Monsters at his beck and call

Prankster Harry

Weasley/Hermione/Wizarding World Bashing

Few survivors to war

Alternate dimension

Het pairing(if any)

Religious(to the point of Halloween and Samhain background at least)

NO:

Romance Centered

wimp Harry

Evil Harry

Good Voldemort/Snape