"I don't drop character 'til I've done the DVD commentary."This is when a character who is an actor (not an actor in Real Life who plays a character) goes so deep into their role that they end up temporarily forgetting their original self. They usually start Method Acting, and before anyone knows it are so immersed in the role they're playing that they almost literally become that role, forgetting their old name, life, and setting aside their original personality. It's worth noting that while this is analogous to Becoming the Mask, the character who becomes this is not a criminal or The Mole, may not even like the role they have immersed themselves in, and has gone so deep into the role that they don't lament any Loss of Identity or even remember having been a different person (much less compare that life to the present). While in this state the character may act against their own interests or those of their allies and loved ones, though a good slap may fix them, or pushing a Berserk Button their normal self would take issue with. If the character had a previous psychological disorder, this may result in temporary Loss of Identity or even forming one or more Split Personalities. In extreme cases it may take Deprograming to bring them back. This trope can be considered a mundane, non-Phlebotinum version of getting hit with Laser-Guided Amnesia and having Fake Memories implanted. A Sister Trope to Cannot Tell Fiction from Reality. Compare with Becoming the Mask, where con men or The Mole who grow to like their assumed identity more than their original one, and also That Man Is Dead, in which the character emphatically rejects his old identity. Compare also Enforced Method Acting, where this is imposed on an actor. Contrast Brainwashed and Crazy and Split-Personality Takeover.
— Kirk Lazarus, Tropic Thunder
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Anime and Manga
- In Yu-Gi-Oh! ZEXAL, Fuya Okudaira, a child actor, is pressured by his Stage Mom to not speak with other children and to focus on his role as D.D. ESPer Robin. While Fuya wants to be friends with other kids, he doesn't want to disappoint his mother. Upon coming across a Numbers card (which amplifies the user's desires, usually to a sinister extent) that takes a form similar to his mother, he begins to believe that he really is D.D. ESPer Robin, and vows to protect his card, No. 83: Galaxy Queen, as he would his own mother.
- In Midori Days, Seiji and his Delinquent friends get called upon to play the roles in a movie of the underlings of a character played by Aikawa Shou, their favorite actor. During Shou's tearful death scene, the boys get too worked up, rise up and beat the crap out of the actors playing the guys who killed him. The director decides to Throw It In.
- In the anime film Perfect Blue, Mima confuses scenes from the TV series in which she acts with reality, played for Mind Screw.
- Gary Gulman has a routine where he talks about roleplaying a teacher-student scenario with his girlfriend as foreplay. Gulman quickly gets too caught up in his teacher persona and becomes more interested in his girlfriend passing her fictional class than having sex with her.
- Back when The Joker had his own comic series in the 1970s, one of the opponents he faced was an actor who had started to believe he actually was Sherlock Holmes.
- The post-Zero Hour! version of the second Two-Face, Paul Sloane, was reimagined as an actor so involved in method acting that he ended up turning himself into one of Batman's deformed, psychotic rogues while researching a part.
- One of the possible deaths of Batman in Whatever Happened to the Caped Crusader? has him trying, and failing, to talk down an actor who got lost in the supervillain part he was hired to play.
- In recent interpretations, Spider-Man enemy the Chameleon sometimes has trouble discarding his assumed identities without some mental issues.
- In a 1970s story, a combination of psychological conditioning and PTSD left Marvel Comics super-spy the Black Widow mentally "stuck" in her cover identity as mousy schoolteacher Nancy Rushman.
- This was part of Judge Doom's backstory in Roger Rabbit: The Resurrection of Doom, explaining why nobody knew who he really was until after the events of the movie.
- The Vertigo reboot of Human Target made this a key part of Christopher Chance's success. He was so good at impersonating his clients that he actually built himself into their personalities in order to fool whoever was trying to take a swing at them, and required extensive deprogramming once a job was complete.
- A combination of the Scarecrow's Fear Gas and the mind-altering System lead Jean-Paul Valley to believe that not only was he Batman, but the one true Batman, going so far as to claim that he was nothing if he couldn't be Batman.
- In the Tintin story The Secret of the Unicorn, Captain Haddock gets so wrapped up in the tale of his famous ancestor Sir Francis Haddock that he runs off some visitors at cutlass-point in the belief they're pirates, and demolishes his room while relating the battle with Red Rackham.
- This concept is a metaphorical interpretation of Black Swan. Nina, sweet and a perfect representation of the White Swan, tries so hard to become the Black Swan that she loses herself.
- The 1947 Film Noir A Double Life is all about this, where an actor (Ronald Coleman) playing Othello on Broadway finds his life being taken over by the role and eventually follows in the part's footsteps when he murders his mistress.
- Deconstructed and parodied in Tropic Thunder by Robert Downey, Jr.'s character. During the DVD commentary, RDJ stays in in character as Kirk Lazarus as Sergeant Lincoln Osiris until the very line of the movie where Osiris claims not to break character until the DVD commentary. When Ben Stiller calls him on it, he finally breaks character... down to Kirk Lazarus, acclaimed Aussie actor. It's only when Lazarus has his own "Who am I?" moment in the film that Robert Downey Jr. emerges.
- According to the sequel comic, Judge Doom of Who Framed Roger Rabbit was originally a Toon actor named Baron Von Rotten, who often played villainous roles (a deleted scene of the movie claimed Doom was the one who shot Bambi's mom). A concussion during a shoot led him to think he really was a villain.
- In Bad Education Juan is only pretending to be his dead brother, Ignacio. But in the process, Juan gradually ends up in the exact same situation, such as getting involved with the same men and dressing up as a transvestite.
- In a similar effect like the one in Perfect Blue, Nikki Grace from Inland Empire confuses her acting with reality, at a point where is impossible, even for the spectator to tell which is which.
Nikki:Damn... It's sound like dialogue from our script!Kingsley: Cut, cut it.
- Galaxy Quest: Due to the premise, this is a recurring joke for the whole cast. Just about everyone has a moment where they forget their real selves, Guy especially (who only had a one-time bit part on the show). Hell, by the end, even Alexander is in on it, and he always hated his role!
- Kurt Vonnegut's "Who Am I This Time?", featuring an actor who entirely inhabits his roles, because he doesn't really have a personality outside of them. Later adapted to an excellent made-for-TV movie starring Christopher Walken and Susan Sarandon, and directed by Jonathan Demme.
- In Robert A. Heinlein's Double Star, the main character is hired to impersonate a kidnapped politician. He becomes so immersed in being this man that after the original is killed, he takes over and actually becomes him. By the end of the book, he's forgotten he was ever anyone else.
- In the X-Wing Series, Gara Petothel is a Deep Cover Agent formerly from Imperial Intelligence who no longer has anyone to deprogram her between missions. During one infiltration she's profoundly impacted by the Power of Trust and hopes to Become the Mask and embrace the role of Lara Nostil, a Farm Girl-turned-Ace Pilot. But then she's contacted by the (dead) Nostil's (fake) brother with a message from the Big Bad, complete with doctored family holograms in the background that insert Gara into Lara's life. This is not good for her already fragile mental state.
- It's implied that going to the EDGE of this, is key to Imperial training. However, being away from her handlers has likely hurt her ability to keep from going over the edge.
- In the end, it's played with. She purposely becomes lost in the cover identity of 'Kirney Slane'...but only to reclaim something as a 'real her'. She's still aware of Lara, and Gara, but chooses to identify with neither. Lara was a cover identiy, Gara was a bad person. Kirney can be someone new.
- In The Barsoom Project, a young LARPer named Michelle is handed a working rifle by a saboteur and unwittingly kills an extra in the Fimbulwinter Game. Unable to face what she's done, she convinces herself she really is her character, "Eviane", who'd shot the man because he was a villain trying to impose Endless Winter upon the world.
- The titular hero of The Belgariad discusses this with Silk, the True Companions' resident thief and con artist, who has been employing an exaggerated version of his actual identity as an Alorn prince as a cover.
Garion: “I’ve been meaning to ask you about something. Always before, you acted almost as if you were ashamed of your title. Here in Mallorea, though, you seem to want to wallow in it.”Silk: “What a fascinating choice of words.”Garion: “You know what I mean.”Silk: “In the West, my title’s an inconvenience. It attracts too much attention, and it gets in the way. Things are different here in Mallorea. Here, nobody takes you seriously unless you’ve got a title. I’ve got one, so I use it. It opens certain doors for me and permits me to have dealings with people who wouldn’t have time for Ambar of Kotu or Radek of Boktor. Nothing’s really changed, though.”Garion: “Then all of that posturing and pomposity—pardon the terms—are just for show?”Silk: “Of course they are, Garion. You don’t think I’ve turned to a complete ass, do you?”Garion: “Then Prince Kheldar is as much a fiction as Ambar and Radek, isn’t he?”Silk: “Of course he is.”Garion: “But where's the real Silk?”Silk: “It's very hard to say, Garion. Sometimes I think I lost him years ago.”
- Who Goes There?: The Things.
Garry spoke in a low, bitter voice. "Connant was one of the finest men we had here—and five minutes ago I'd have sworn he was a man. Those damnable things are more than imitation." Garry shuddered and sat back in his bunk.And thirty seconds later, Garry's blood shrank from the hot platinum wire.
Live Action TV
- In an episode of Buffy the Vampire Slayer Drusilla uses her psychic talents to appear to Giles as his former lover Jenny Calendar in order to seduce some information from him. She gets so carried away in the role that she continues making out with him for some time after learning what she was after.
- For that matter, the actors themselves would do this on more than one occasion. Memorably, Sarah Michelle Gellar was so invested in her character's romance with Angel that when he turns evil and abuses her, in the scene where she runs home and cries she is so broken up they had to close the set for half an hour.
- A parallel situation occured in the first season of Angel, when Angel has to give back his day as a mortal man. Both Sarah Michelle Gellar and David Boreanaz were at a literal breaking point at the end of the episode. Boreanaz gently whispered "Sarah, Sarah" to her, because her tears were genuine.
- Another example, this time overlapping with Becoming the Mask, was when Faith switches bodies with Buffy and then impersonates her for several days. She becomes so enamored with Buffy's heroic lifestyle (with loving family and friends looking up to her), that when she has the chance to skip town free and clear she instead comes back to save innocent hostages from a group of vampires "because it's wrong". When Buffy-in-Faith's-body shows up to confront her afterwards, all Faith's own self-loathing comes pouring out in their fight; she beats the crap out of her former body while screaming that she's dirt, trash, and evil. Buffy is able to switch their bodies back, but is so shaken by what she just witnessed that she doesn't pursue Faith when she immediately flees.
- This was parodied in an episode of Community, when Abed told the story of creating and then becoming a character for his walk-on role in Cougar Town.
- Danny Pudi filmed a cameo on Cougar Town in reference to this scene. It's glorious.
- Abed made up a role for him to play in Cougartown named Chad, and as he made up Chad's backstory in his head, he realized that he had spent all of his life to that point dedicated to pop culture, and Chad had a significantly more fulfilling life than he did. When filming ended and he was forced out of character, he had a mental crash, fell over and shat himself.
- Parodied in "Documentary Making: Redux", wherein Jeff is reluctantly cast as the Dean for a short commercial for Greendale and is forced to wear a bald cap over his natural hair. The shoot is only supposed to be for one day, but thanks in part to Jeff's own efforts to try and get out of it it ends up going for almost two weeks – all of which time Jeff is forced to wear his Dean's costume. Over this time Jeff gradually begins to take on several of the Dean's character traits and becomes convinced that he's actually a bald man who "only dreamed of having hair".
- This is arguably the super-power of Echo, the protagonist of Dollhouse. Despite repeated memory wipes, she always retains the "imprints" of the other personalities she's assumed.
- Possibly Sophie Devereaux in Leverage. She mentions before her sabbatical that she's created so many fake personas she's not really sure what's really her anymore and leaves to bury each of them. This extends so far that we're not sure what her real name is.
- This was the plot point in the Monk episode "Mr. Monk and the Actor," when a TV movie was being made about Adrian Monk, starring renowned actor David Ruskin as him. Except, Ruskin has a history of falling too deeply into his roles (for example, once having to spend three months in a rehab clinic after playing an alcoholic in a TV movie, because he managed to have all the symptoms of alcoholism without drinking), and when he portrayed Monk... Afterward, in session with Dr. Kroger, Monk notes that Ruskin has decided to try something less depressing, then adds "He's in England playing Hamlet."
- An odd example with Jeremy Brett as Sherlock Holmes; he became ill while obsessing over the character – realizing that he was manic depressive allowed him to start overcoming his obsession to the point where he could enjoy playing Holmes. He died eleven years after Sherlock Holmes first aired, and had quit the series entirely the year before his death.
- In The Twilight Zone (1959) episode "A World of Difference", this is what everybody thinks happened to Gerry Raigan, an alcoholic actor who seems to have snapped and identified too closely with happy executive character Arthur Curtis. He, on the other hand, thinks that he actually is Curtis, trapped in a nightmare world.
- On WKRP in Cincinnati, a well-paying job requires Johnny Fever to play an obnoxious, boisterous host of a televised disco dance show, to the point he actually does begin to lose himself, and becomes frightened this vile character will become him. Twice as interesting for the fact that Johnny Caravella already plays a role as Doctor Johnny Fever – but it is a role he likes. His best friend Gordon Sims tried to lose himself in the role of Venus Flytrap, to escape from the memories of his time in Vietnam. They catch up with him anyway.
- In an episode of the 1970s British TV series Colditz, an officer in the World War 2 German prisoner of war camp simulates insanity so that he will be repatriated to Britain, the plan being that he will then reveal himself as sane and return to action. His simulation succeeds only too well – at the end of the episode, the prisoners in Colditz receive a letter from the officer's wife relating that he actually went insane and is now confined to a mental institution. The escape committee then decides that no other prisoner in Colditz is to attempt that ploy.
- Misfits had a Femme Fatale character who turned out to be this; she was auditioning for a part when the storm happened, and her power made her become that character. Unfortunately for everyone involved, this also means she subconsciously exerts a degree of Mind Control, compelling the men she gets involved with to fall into the roles of her recurring story: first as her secret lover, then her savior from her abusive ex-, finally becoming her abusive ex- for the next guy in the cycle to save her from.
- One episode of Press Gang concerned an actor who played the lead role in children's adventure serial Colonel X, who had been severely typecast and 'drinking rather too much' before getting into a car crash which killed his wife. Unable to handle it, he started going around in-character as the Colonel, aided by how the press erroneously reported him dead along with his wife. (This is a mashup of problems affecting famous Doctor Who actors Tom Baker and Rodger Delgado (who played the Master), and the Colonel is played in the show by Michael Jayston, who played the not-quite-Doctor the Valeyard. The episode was written by Steven Moffat, who later went on to... well, yeah.)
- This was also parodied in a 2009 Garfield strip, with the dialogue as follows;
General on TV: Holy bovines, Corporal! There's a giant monster invading the city!Soldier on TV: That's not a monster, sir.General: What are you talking about? Call out the artillery!Soldier: It's just a bad actor in a rubber suit.General: Oh, it is not! It's a monster!Soldier: Come on... I can see the zipper.General: Egad! A zipper monster! That's the worst kind!Soldier: And that's not a real city.General: Insolence! I'll have you court-martialed!!Soldier: These are just tiny little model buildings.Garfield: General Cordwood seems to have buried himself in the part.Soldier: See?General: PUT MY HOUSE DOWN!!
- Back in the days of kayfabe, it was normal for a wrestler to live his gimmick 24/7.
- During his run as the leader of the Ministry of Darkness, it was hinted a few times that The Undertaker was letting his character completely take over who he really was as a person. In a way, this was strengthening Kayfabe by breaking it.
- According to kayfabe, the Boogeyman was an aspiring television actor who couldn't let go of his commitment to a role after his horror series was cancelled.
- There were a lot of rumors floating around about him while he was wrestling; dirt sheets commonly reported that he actually did eat worms back stage (he'd eat them in the ring as part of promos to freak his enemies out...or just because) and that he'd stay in character all the time.
- El Santo. Lucha Libre legend throughout the 50s and until his death in 1984. He became known for his silver mask, which he only removed once for the public eye, and was buried with it on.
- Rey Mysterio Jr., too, who in a sense is his mask. In fact, if you saw him bare-faced, you might not even know who it is.
- The guys behind WrestleCrap have suggested this is what happened to Jim Hellwig, the Ultimate Warrior, who went so far as to have his name legally changed to "Warrior."
- Born Joanie Laurer, Chyna did the same thing.
- In both cases, it was merely a way to get around the WWE (with whom both had burned bridges) having copyright over the name by which they were known.
- Born Joanie Laurer, Chyna did the same thing.
- when the cast of I'm Sorry I'll Read That Again reformed for their last series in 1973, after a five-year break, this phenomena was Lampshaded in a mainly-comic sketch. Tim Brooke-Taylor was viewed as so identified with his famous radio personality of Lady Constance de Coverlet, that he simply couldn't get out of character. Fellow cast member Graeme Garden - playing on the fact he genuinely is a qualified medical doctor - diagnosed the condition and performed an "operation" on set to surgically seperate Tim from Lady Constance - incidentally parodying TV medical dramas and soap operas.
- Hamlet is sometimes interpreted this way, with Hamlet's feigned insanity leading to him actually losing his grip on reality.
- Metal Gear series:
- As with so many other tropes, this one is deconstructed in Metal Gear Solid: Decoy Octopus is so committed to his disguises that he requires deprogramming to leave his assumed identities after a mission.
- The purpose of the S3 program imposed upon Raiden in Metal Gear Solid 2: Sons of Liberty was to inflict this upon him, turning him from a former child soldier who rewrote his whole past with the power of denial into a second embodiment of Solid Snake.
Colonel: This is a type of 'role-playing game'. The point is that you play out your part – and I expect you to turn in a perfect performance!
- In Metal Gear Ac!d, La Clown is able to 'become' Teliko so thoroughly that La Clown is able to access Teliko's memories and feelings, only breaking character when telling Snake her codename of Swallowtail. Apparently only a powerful psychic can detect the difference between La Clown's stolen memories and a person's real memories.
- In Phoenix Wright: Ace Attorney – Dual Destinies, the Big Bad is the phantom, an international spy who's spent so much time impersonating people that he's completley forgotten his originial identiy.
- In one of the many endings on the PC video game adaptation of And Then There Were None, one of the culprits is an actress who got too far into character and committed a murder for real.
- Martin Brown, one of the player characters of Hotline Miami 2: Wrong Number, is an actor portraying Jacket in the fictional Midnight Animal film. In the dream sequence of one of his chapters, he professes his love of killing teenagers and attacks an interviewer. When confronted with Richard, Martin tries to explain that it's only a film, but Richard isn't buying it.
- In The Five(ish) Doctors Reboot, several of the ex-Doctors are portrayed in this way as part of their copious Adam Westing. Peter Davison, for instance, is well aware that he isn't actually the Doctor but seems to think that he can actually use the TARDIS to travel in time, and Tom Baker is portrayed ambiguously (via a Fake Shemp) – he's either convinced he is the Doctor for real, or he actually is the Doctor for real.
- The Xanadu Storyverse has an inversion occur sometimes. Technically, it's Becoming the Costume, but this only happens sometimes to someone who was changed. On the other hand, the costuming was a mass event. Changed people who have had their minds replaced are called "strangers".
- Taken to frightening extremes in Guilded Age: The five main characters are online gamers selected to take part in a deep-immersion virtual reality role-playing game, and due to the unique magic/technology hybrid nature of the game, they think they actually are their game characters, with absolutely no memory of who they really are or the lives that they used to have.
- In an episode of Kim Possible The Fearless Ferret and White Stripe's actors forget they are actors and think they are their own characters.
Timothy North: So what have you been up to lately?
Rudolph Farnsworth: Oh living each day in delusion thinking fiction is reality. That's me.
Timothy North: Me too.
- In an episode of the "Super Chicken" segment of George of the Jungle, an actor portraying a Snidely Whiplash-like character abducted the actress portraying the damsel in distress, making her a real Damsel in Distress.
- In the second episode of Ultimate Spider-Man, Agent Coulson is made the new principal at Peter Parker's school, so he can keep an eye on Pete and his friends. Midway through the next episode, he calls Nick Fury, frantically begging for the full power of SHIELD... to help balance the school's budget.
- Happens in A Flintstones Christmas Carol, while Fred is busy rehearsing his part of Scrooge and starts acting like a selfish jerk to his family and friends.
- The Simpsons has Duffman, whose actor-–or at least one of them–-openly admits he has no distinct personality out of his costume anymore and cringes to be called by his real name (Larry Duffman).
- It's later implied that this happens to all the actors playing Duffman, when Homer mentions he thought he heard he'd died.
Duffman: Duffman can't die, only the actors who play him. Oh yeah!
- One-shot minor Character Senor Ding-Dong was only a man playing the role of a doorbell company mascot, a Zorro-style hero who fixes doorbells with a whip. Then he just became that character entirely.
- Implied to have happened to the ventriloquist operating Gabbo, who repeatedly begs the puppet to stop calling the audience "SOB's", not realising that the camera was still rolling at the time.
- It's later implied that this happens to all the actors playing Duffman, when Homer mentions he thought he heard he'd died.
- In South Park, Cartman creates a very unfunny and very racist handpuppet impersonation of Jennifer Lopez for a diversity event. He soon completely loses control over everything he makes Jennifer do, and "she" gets a record deal despite Cartman's protests, engages in a sexual relationship with Ben Affleck, ends up in hospital thanks to assault from the real Jennifer Lopez, eventually reveals she is actually a con artist named Mitch Connor, swallows a Cyanide Pill and dies. Subverted in the final seconds of the episode when it's revealed Cartman was just doing it to convince Kyle that this trope was in play, so he could laugh at him about it.
- Although Mitch Conner returns in 200 and knows Mr. Hat, making this more confusing.
- "Super Fun Time" has the boys and their class visit a 19th century living history museum. The actors playing the villagers refuse to break character for any reason, even when a group of thieves takes everyone in the museum hostage and demand they give the code to a locked door (they actually kill the one actor who breaks character to give the code).
- In an episode of Ducktales when an amnesiac Scrooge goes missing, the boys have Fenton impersonate him until he can be found. Fenton gets too caught up into the role and starts pinching pennies even harder than the real Scrooge, up to and including cutting both the housekeeper's pay and the nephews' allowances! When the real Scrooge finally regains his memory and starts proving himself to be the real deal, by this point Fenton has lost himself in the role so much that he tries to have his own boss arrested.
- In Ed, Edd 'n' Eddy, Double D and Eddy dress up Ed in a monster costume vaguely resembling a xenomorph in hopes that maybe he'd attract customers to their fair, but Ed's overactive imagination soon takes over and he soon starts truly believing he is a monster and starts attacking all the kids in the cul-de-sac.
- Edd: This is worse than I thought! This isn't as simple as pretending or play-acting, Eddy! Ed actually believes he's become a monster!
- The Legend of Korra: Bolin does this when he gets some Acquired Situational Narcissism after playing Nuktuk, hero of the south, refusing to answer to his actual name, and not understanding why exactly the actress he works with isn't interested in him off-stage.
- Toph from Avatar: The Last Airbender seems to joke about this when she was playing the villain for training. When she throws a flaming boulder too close to Sokka she cries out:
- In an episode of Peter Pan & the Pirates when Peter obtains Hook's hat he starts acting like a pirate captain himself. He gets so caught up playing the role though that he winds up literally believing himself to be a real pirate, to the point of even talking in Hook's voice. This ends up with the real Hook joining forces with him and Peter trying to feed Wendy to the crocodile!
- This is not unprecedented for practitioners of Method Acting, and can have very real and very negative effects on the actor in question. A good portion of acting training is in fact learning how to avoid this.
- The Canadian actor Raymond Massey, best known for his many, many portrayals of Abraham Lincoln on stage, film, and television, eventually became so obsessed with perfecting his performance that he started to assume the vocal and physical mannerisms of Lincoln in day-to-day life, even appearing at social gatherings dressed in Lincoln-esque clothing. A friend said of his obsession, "Massey won't be satisfied until someone assassinates him."
- Rumours abounded that Heath Ledger's take on The Joker was at least in part responsible for his death. The Joker's psyche certainly is unsettling, to say the least. His co-stars seem to debunk this theory as they said he seemed really relaxed between takes and on stage, and in no way exhibited behavior that supports this theory. Likewise, at the time of Ledger's death, he was working on another film, Terry Gilliam's The Imaginarium of Doctor Parnassus which was a comic performance and far less stressful.
- Andy Griffith noted that he had this problem when playing Lonesome Rhodes in A Face in the Crowd, and it led him to mostly stay away from such roles for the rest of his career.
- Combined with the substance abuse issues he had at the time, David Bowie was noted to at least be worried about this happening with some of his stage personas, particularly the unsettling and unpleasant Thin White Duke from Station to Station, which in turn derived from his appearance in The Man Who Fell to Earth. This led to him moving away from adopting full characters on stage at around the same time as he pulled himself out of his addiction. Later in life, Bowie said he was afraid that his Ziggy Stardust character would come back into his mind and drive him completely insane.
- The same thing nearly happened to Alice Cooper as his alcoholism spiraled out of control in the 1970s. A stay in a sanitarium pulled him out of it.
- Peter Sellers. Directors often described him as "not having any real personality of his own". At one point during an interview, after demonstrating a wide variety of voices and character types, the interviewer asked if he was now speaking in his real voice. After some hesitation, he replied with a confused "I don't know." When Sellers was the guest on The Muppet Show, unlike any other guest on the series, he never appeared on-screen out of character. During the "five minutes to showtime" intro, he's Inspector Clouseau from The Pink Panther. This appearance is the source of his famous quote, "There is no me. I do not exist."
- Actors who played the Doctor from Doctor Who have been prone to this, as the Doctor is said to be one of those characters (much like Sherlock Holmes) who just gets into an actor's head and erodes their identity, and prolonged exposure is extremely dangerous – most Doctors only play the character for short runs as a protective measure against this. A couple, however, slipped into this:
- Due to the serious mental health problems he was experiencing at the time combined with a punishing shooting schedule, William Hartnell, who played the first Doctor, is reported to have, at times, not known if he was the Doctor or not. He slipped into character to talk his way out of a parking ticket at one point, which is understandable, but apparently would also slip into character to get away from familial obligations, and occasionally even for no obvious reason.
- The other Doctor whose mental health tanked as a result of the role, Tom Baker, would reportedly keep up character whenever he was out and about for the benefit of child fans, but seven years of being the Doctor both onscreen and off took its toll on both his stress levels and his ability to distinguish Doctor Who from reality. He was unable to stop comparing himself to the character and experienced intense self-loathing for not being so wonderful and heroic as him, in particular struggling to accept his inability to save people from real problems the way the Doctor could save people from monsters, and found himself succumbing to various personality flaws that he had but the Doctor was too perfect for.
- Bob Hoskins had a tendency to hallucinate towards invisible animated characters for a short while after filming of Who Framed Roger Rabbit wrapped up.
- Daniel Day-Lewis dropped out of doing theatre when he appeared in a production of Hamlet and had a breakdown in the scene where he confronted his father's ghost. He later admitted that he projected his own estranged father, the poet Cecil Day-Lewis, into his performance and actually believed he had seen his father's ghost.
- This can be a problem with less mature cosplayers at Fan Conventions and the like; one may become so absorbed in acting out the character they're dressed as that they go to harmful lengths to imitate the character, such as stalking and harassing cosplayers dressed as the character's love interests, often without those cosplayers' consent. It gets worse if the character is Ax-Crazy or unhealthily obsessed with said love interests.