[@Crusader Lord]

Out of these options I believe that the mutant faction would fit best within the RP. While I'm not opposed to factions based out of DLC content since all the DLCs take place outside of the Mojave it would be hard to justify their presence and their relationship to the Green.

With the mutants however, Jacobstown and Black Mountain have both been abandoned by the mutants. While I never explicitly stated to what happened to them, the location of Jacobstown has been taken over by the Green. If you're searching for another place to have them based then I'd suggest: Searchlight or the REPCONN Test-Site