Alter ego

alter-egodouble lifealter egosalteregoalteralter-egosalternate personalityalternate personasdouble livesdual life
An alter ego (Latin for "other I") is a second self, which is believed to be distinct from a person's normal or true original personality.wikipedia
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Doppelgänger

doppelgangerdoppelgangersdoppelgängers
Related concepts include avatar, doppelgänger, impersonator, and dissociative identity disorder (DID).
However, the concept of alter egos and double spirits has appeared in the folklore, myths, religious concepts, and traditions of many cultures throughout human history.

Clark Kent

ClarkClarc Kent-son/the Super-Manalter ego
In comic books, superheroes and their secret identities are often considered alter egos. The archetypal comic book hero, Superman, assumes the identity of the "mild-mannered" newspaper reporter Clark Kent in order to live among the citizens of Metropolis without arousing suspicion. The Incredible Hulk comic book series further complicates this theme, as Bruce Banner loses control to the Hyde-like Hulk whenever he becomes angry, yet also depends upon the Hulk's super powers in order to combat villains. Comic book-inspired alter egos can be seen in other forms of popular fiction, including television and movie adaptations of comic books, parodies of this genre, and unrelated fictions.
As Superman's alter ego, the personality, concept, and name of Clark Kent have become ingrained in popular culture as well, becoming synonymous with secret identities and innocuous fronts for ulterior motives and activities.

Ustaad (1999 film)

UstaadUstadUsthaad
The Malayalam movie Ustaad written by Ranjith and directed by Sibi Malayil and starring Mohanlal has a theme of alter ego.
The plot follows Parameshwaran (Mohanlal), a soft-spoken businessman, who leads a dual life as an underworld don named Ustaad.

Hannah Montana

Hannah Montana Foreverof the same nameeponymous television series
In Disney's Hannah Montana, Miley Stewart, played by Miley Cyrus, leads the life of high school student, and the life of teen pop sensation Hannah Montana allowing her to get the best of both worlds. Likewise, Miley's friends, Lilly Truscott, played by Emily Osment, and Oliver Oken, played by Mitchell Musso, also lead the lives of high school students, and are what makes up Hannah's entourage, Lola Luftnagle and Mike Stanley III respectively.
It focuses on Miley Stewart (portrayed by Miley Cyrus), who is a teenager living a double life as an average schoolgirl by day and as the famous recording artist Hannah Montana by night, which she keeps secret and only a few people know of her alter ego.

Miley Stewart

Hannah MontanaMiley Stewart / Hannah MontanaMiley Stewart/Hannah Montana
In Disney's Hannah Montana, Miley Stewart, played by Miley Cyrus, leads the life of high school student, and the life of teen pop sensation Hannah Montana allowing her to get the best of both worlds. Likewise, Miley's friends, Lilly Truscott, played by Emily Osment, and Oliver Oken, played by Mitchell Musso, also lead the lives of high school students, and are what makes up Hannah's entourage, Lola Luftnagle and Mike Stanley III respectively.
Miley is a normal teenage girl who, as her alter ego Hannah Montana, secretly leads a double life as a world-famous pop star.

Secret identity

secret identitiesdual identityidentities
In comic books, superheroes and their secret identities are often considered alter egos. The archetypal comic book hero, Superman, assumes the identity of the "mild-mannered" newspaper reporter Clark Kent in order to live among the citizens of Metropolis without arousing suspicion. The Incredible Hulk comic book series further complicates this theme, as Bruce Banner loses control to the Hyde-like Hulk whenever he becomes angry, yet also depends upon the Hulk's super powers in order to combat villains. Comic book-inspired alter egos can be seen in other forms of popular fiction, including television and movie adaptations of comic books, parodies of this genre, and unrelated fictions.
Alter ego

Shadow the Hedgehog

Shadowandroidsultimate life form
Sonic the Hedgehog and Shadow the Hedgehog are considered as alter ego look-a-likes of each other.
Shadow is sharp witted, seemingly always on the edge, and is described as the dark incarnation or an Alter Ego look-a-like of Sonic.

Calvin and Hobbes

CalvinTracer BulletCalvinball
In Calvin and Hobbes, Calvin has multiple alter-egos: Spaceman Spiff, Stupendous Man, Tracer Bullet, and various other unnamed egos in Calvin's fantasies.
Three of his alter egos are well defined and recurrent:

Roger (American Dad!)

RogerRoger SmithRoger the Alien
In American Dad, Roger the Alien assumes various alter egos in order to go out in public without letting anyone finding out that he is a space alien.
Adding to this, he's created countless alter egos to go along with them.

Latin

Lat.Latin languagelat
An alter ego (Latin for "other I") is a second self, which is believed to be distinct from a person's normal or true original personality.

Psychology of self

selfsense of selfSelfhood
An alter ego (Latin for "other I") is a second self, which is believed to be distinct from a person's normal or true original personality.

Personality psychology

personalitypersonalitiespersonality theory
An alter ego (Latin for "other I") is a second self, which is believed to be distinct from a person's normal or true original personality.

Dissociative identity disorder

multiple personality disordermultiple personalitiessplit personality
Related concepts include avatar, doppelgänger, impersonator, and dissociative identity disorder (DID). The term appeared in common usage in the early 19th century when dissociative identity disorder was first described by psychologists.

Cicero

Marcus Tullius CiceroTullyCicero’s
Cicero coined the term as part of his philosophical construct in 1st-century Rome, but he described it as "a second self, a trusted friend".

Ancient Rome

RomanRomansRome
Cicero coined the term as part of his philosophical construct in 1st-century Rome, but he described it as "a second self, a trusted friend".

Literary criticism

literary criticcriticliterary studies
A distinct meaning of alter ego is found in literary analysis used when referring to fictional literature and other narrative forms, describing a key character in a story who is perceived to be intentionally representative of the work's author (or creator), by virtue of oblique similarities, in terms of psychology, behavior, speech, or thoughts, often used to convey the author's own thoughts.

Character (arts)

fictional charactercharacterfictional
A distinct meaning of alter ego is found in literary analysis used when referring to fictional literature and other narrative forms, describing a key character in a story who is perceived to be intentionally representative of the work's author (or creator), by virtue of oblique similarities, in terms of psychology, behavior, speech, or thoughts, often used to convey the author's own thoughts.

Psychology

psychologicalpsychologistpsychologists
A distinct meaning of alter ego is found in literary analysis used when referring to fictional literature and other narrative forms, describing a key character in a story who is perceived to be intentionally representative of the work's author (or creator), by virtue of oblique similarities, in terms of psychology, behavior, speech, or thoughts, often used to convey the author's own thoughts.

Franz Mesmer

MesmerFranz Anton MesmerDr. Mesmer
Anton Mesmer used hypnosis to separate the alter ego.

Hypnosis

hypnotismhypnotisthypnotic
Anton Mesmer used hypnosis to separate the alter ego.

Wakefulness

awakeawakeningwaking
These experiments showed a behavior pattern that was distinct from the personality of the individual when he was in the waking state compared with when he was under hypnosis.

Consciousness

consciousconsciouslyhuman consciousness
Another character had developed in the altered state of consciousness but in the same body.

Avatar

avatarsincarnationavatara
Related concepts include avatar, doppelgänger, impersonator, and dissociative identity disorder (DID).

Impersonator

impersonationimpersonatingimpersonate
Related concepts include avatar, doppelgänger, impersonator, and dissociative identity disorder (DID).

Robert Louis Stevenson

StevensonR. L. StevensonR.L. Stevenson
The title characters in Robert Louis Stevenson's thriller Strange Case of Dr Jekyll and Mr Hyde represent an exploration of the concept that good and evil exist within one person, constantly at war. Edward Hyde literally represents the doctor's other self, a psychopath who is unrestrained by the conventions of civilized society, and who shares a body with the doctor. The names "Jekyll and Hyde" have since become synonymous with a split personality or an alter ego that becomes capable of overpowering the original self.