https://westportlibrary.libguides.com/Doppelgangers
https://www.britannica.com/art/doppelganger
The+doppelganger seems to be a natural phenomenon in most cases.
https://forgottenrealms.fandom.com/wiki/Doppelganger Then there is the shapeshifter variety.
If this world is like someones laboratory, farm or corrupted garden, then there are astounding implications.
https://thedigitallabyrinth.blogspot.com/search?q=the+doppelganger
