Collaboration Weapons and Items are unique set of items in Fortnite: Battle Royale. They exist only as a collaboration between Fortnite and other media franchises. A full list of Collaborations can be seen here.
List of Items
This list includes every which exists as a collaboration between Fortnite and another Franchise. However, some items have been omitted from this list, as their inclusion extends beyond collaboration, and have since been implemented as standard items. These are the Tactical Assault Rifle and the Combat Shotgun.