- he was born in grand line but it doesnt say where
- roger took the same route through Paradise as luffy starting from sky island, so he must have been in alabasta, but the story always avoids showing roger in alabasta for some reason.
im not even joking lol i seriously believe hes a nefertari. all important figures other than cobra are women so i assume the royal blood is matrilineal. maybe buggy had no path to the throne so he became a pirate