Regi spawns in a bombed-out building west of the Corvega assembly plant with a small army of radroaches when the player character reaches level 35. Before the Brotherhood of Steel have arrived in the Commonwealth, he carries a minigun and another legendary item based on the player character's level. After the Brotherhood of Steel have arrived in the Commonwealth, he carries a Gatling laser instead of a minigun.
Interactions with the player character
|This character has no special interactions.|
- The Sole Survivor says "Don't move, Roach!" when holding him up with the Intimidation perk.
- If one reaches his bombed-out building before reaching the appropriate level, it will only be inhabited by the roaches.
Regi Blattaria appears only in Fallout 4.
Behind the scenes
His roach army, and the fact that his name roughly translates to King Roach (Regi from Regis, while Blattaria is the Latin name for cockroach) while he is carrying a minigun all imply he is a reference to the Roach King from Fallout 3. There is even a toy rocket reminiscent of the Roach King's throne on a shelf near his spawn point. To support this, within the game's code his editor ID is POIRoachKing.