Board Thread:General Discussion/@comment-25881825-20160213052832/@comment-26453713-20160404031442

CrusaderDeleters wrote: Ben Wagner wrote: I think there's like a 1 in 1000 chance of finding mysteryman without touching save files. So yeah, very rare. 1 in 100* each for Goner Kid, the 3 G Followers, and Mr.y Man.

I think the door itself also has a 1 in 10 to spawn. Not sure about the specifics.