Fallout 76 Allies

Overview
Allies were first introduced in the Wastelanders update, as humans returned to Appalachia. Instead of the usual companion system seen in other Fallout games, allies act as "roommates" at the player character's C.A.M.P. and are tied to unique settlement objects. The player character can only have one ally in their C.A.M.P. at a time; this extends to their C.A.M.P. storage as well.

If one wishes to change their current ally, they must scrap the present settlement object and build a new one for the different ally. Ally settlement objects are located under their own tab in the build menu ("Ally") and cannot be stored.

Two allies offer unique questlines and an overarching story, at the end of which they can be romanced if one decides to pursue that option. The other three allies only offer radiant quests.

Steel Dawn introduced two new allies, referred to as "lite allies." They can only be unlocked by progressing through The Scribe of Avalon, the third Fallout 76 season. Lite allies will not act as quest givers, and will instead provide other services.

Pets

 * Pets are planned to become a part of the ally system in a future update.

Cut allies
There are two allies with Wastelanders-related editor IDs that were not implemented into the game:
 * Beggar, a male ally voiced by Richard Horvitz; uses the beggar's mat.
 * Hunter, a female ally voiced by Tiffany Wu; uses the hunter's chopping block.

Quest companions
Unlike the main ally system and similar to other Fallout games, many characters may temporarily follow the Vault Dweller during a quest. They will only be available during their associated quest, and will not follow the player character otherwise, nor can they be recruited to live at a C.A.M.P.