Harry the Rattlemaster

 Harry the Rattlemaster is a man living in the Texas Wasteland.

Background
Harry is a vagrant that drifted up from Lubbock. He has managed to control a group of Texas Rattlers and has settled in the area around Fey's Farmhouse. 

Interactions with the player character
Harry the Rattlemaster is a stage boss encountered when the player character is searching the field surrounding the farmhouse. The player character will first encounter an albino rattler then the controller, once both are defeated they can return to Fey to get good reputation.

Appearances
Harry the Rattlemaster was going to appear in the canceled Fallout: Brotherhood of Steel 2.

Behind the scenes
Harry is likely a reference to "Harry the Bunnymaster" from Wasteland, the spiritual predecessor to the Fallout series.