More often then not, a doppelganger will provide sympathetic company, and they are prepared to listen and give advice to humans, either implanting ideas in their heads, or a sort of osmosis. It is said to be bad luck if it is seen, and rarely a doppelganger will make itself visible to friends or family, often causing great confusion. Doppelgangers can be mischievous and malicious if they wish.
Everyone can have a doppelganger.
You don't become a doppelganger, doppelganger exists by God.
She looked exactly like her, as if she were her doppelganger. She wondered if she had a doppelganger somewhere in the world.
Doppelganger Inc. is no longer existing.
It's because your doppelganger can pretend to be you or she might be standing right behind you when that person saw your doppelganger.
I would consider the antagonist as the creature he is. Not who he is but what he is, a Doppelganger.
Doppelganger - 1997 is rated/received certificates of: UK:PG
The cast of Doppelganger - 1979 includes: Donna Loney
It means that the doppelganger is coming after you or it's trying to tell you something.
Doppelganger - 2009 II is rated/received certificates of: USA:PG
You don't.
Doppelganger