What does the word doppelgänger mean?
I heard it on NCIS, the tv show, but I don't know what it means.
a "mythical" creature or demon that assumes the form of whatever it wishes. most of the time they may change at will. May look human, animal, or monstrous. Some believe they can take the form of inanimate objects as well.
A person who looks the same as another
I think it's like some supernatural being that looks exactly like someone else.
I heard of "shadow doppelg?nger " just basically meaning a clone of yourself.xD
a shadow follower who gains an independent personality. may or may not suffer from inferiority complex. will try to kill you.