Maybe you can find an ex-members of old factions, like an ex-Enclave member trying to live a normal life or a couple of ex-Masters army mutants, but never any actual group that represents an old faction. However, in reality, the Legion does not intend to keep any of the promises made. Locations The few surviving members dispersed, joining up with other tribes and gangs across the Mojave, and quickly forgot their heritage. 1 Synopsis 2 Walkthrough 2.1 Assassination 2.2 Diplomacy 3 Quest stages 4 Notes 5 Behind the scenes 6 Bugs The Great Khans have recently aligned themselves with Caesar's Legion, spelling doom for themselves. Two of the Great Khans' endings are this. 9:09pm So it's a 'story' leaving not actual characters leaving the map? Besides these groups, they are quite isolated and hostile to many factions.
However, unlike the Jackals, Fiends, Scorpions and Vipers, the Great Khans are not hostile towards newcomers.