The term is derived from the German language and literally translates into ‘double walker’. It refers to a character in the story that is actually a counterfeit or a copy of a real/ genuine character. Doppelgangers of the main characters usually bear the ability to impersonate the original but have vastly different spirits and intentions. The doppelganger usually has a different appearance but an earthly soul and supernatural hoodwinking abilities that allow it to fool other unsuspecting characters.
Dr. Jekyll and Mr. Hyde