Brimstone (mentioned)

Brimstone was an agent of the Railroad who was killed by B-263.

Background
Brimstone hired B-263 as a detective to find her long-lost mother. However, she eventually found out that B-263 was actually a synth working for the Institute, with the mission to discover the Railroad's hideout. B-263 killed Brimstone before she could blow his cover, but he managed to extract the names of other Railroad agents before her death.

Appearances
Brimstone is mentioned only in the Fallout 4 Creation Club content "Noir Penthouse."