A person who seems to be an exact copy of yourself.
Doppelgangers usually cause trouble by acting as yourself and interacting with other people. It is said that if you come into contact with your Doppelganger that
you will die instantly, leaving the Doppelganger to
play out your own life.
Bob: Hey, Fred,
I don't like you being around
Sara anymore, she says that you
creep her out.
Fred: What are you talking about, man, I haven't seen Sara for years, is she in town?!
Bob: Yeah, I guess it was just a Doppelganger.