doppelganger

noun4

1. •
   A ghostly double of a living person, especially one that haunts such a person.

   • The uncanniness provoked by doppelgangers is particularly acute because the thing that becomes unfamiliar is you. — 2023
2. •
   An evil twin.

   • I've got a pervert doppelganger / He came from over the sea / He hangs around doing sexual crimes / And the blame is getting pinned on me — 1997
3. •
   A remarkably similar double.
4. •
   A monster that takes the forms of people, usually after killing them.