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- Batman: Alfred Pennyworth often uses his middle names (Thaddeus Crane) as an alias when he goes undercover.
- Since Batman didn't want Tim Drake revealing his identity even to other heroes, he sometimes told them that his name was "Alvin Draper." Amusingly, his best friend Superboy immediately dismissed it, on the grounds that no one with that name would willingly go by it; he'd have introduced himself as "Al" or "Vinnie" instead.
- Wolverine uses the identity of "Patch" (wearing an eyepatch), a mercenary, when he acts undercover in the Far East.
- In Knights of the Dinner Table, 'Weird' Pete's go-to alias is John Mephisto; the name of an old HackNoia character of his.
- Daredevil uses "Michael Nelson" (no, not that one), a combination of his father's and best friend's names.
- Nikolai Dante often uses the alias Quentin Durward. Of course, he's never able to maintain the cover for very long.
- Spider-Man foe Mysterio has used the alias of Ludwig Rinehart twice—once when posing as a psychiatrist to try to drive Spidey insane, and again while running a rest-home scam.
- In the James Bond novels by James Gardner, Bond often uses the alias of 'James Boldman'.
- The Saint: Simon Templar liked to use the alias "Sebastian Tombs". Deconstructed after a while, when someone points out that he's used it so often that people just treat it as synonymous with him and it's not actually much use for hiding his identity now.
- Lord Peter Wimsey generally uses his two middle names (Death Bredon) as a Nom de Guerre. If he needs to explain this coincidence, he'll claim that he's a distant cousin of the Wimseys.
- In the Company Z novels by J.T. Edson, Alvin Fog uses 'Rapido Clint' as his alias whenever he poses as a criminal. His partner Mark Scrapton would use 'Commanche Blood'. These two verge of being full-blown 'go-to identities'.
- In the Floating Outfit novels, Alvin's grandfather Dusty Fog often used his middle names 'Edward Marsden' as his go-to alias.
- Gentleman Bastard: Locke Lamora and Jean Tannen have had a lot of aliases in their time... but when pressed for an identity on short notice, they can always fall back on Tavrin Callas. This is sort of a prank on their part; the first time Jean used that name, he was infiltrating the cult of the death goddess and faked his own suicide. They figure if anyone traces the name far enough back, the followers of the death goddess can declare it a miracle.
- In the Lucky Starr series, Lucky's go-to alias is William Williams.
- Author Gordon Korman used "G. Gavin Gunhold" as a running alias across multiple books. Gavin takes on a life of his own more than usual in ''The Wizzle War'' (as the world's most perfect, absentee student) and A Semester In The Life Of A Garbage Bag (an obscure Canadian poet) in particular.
- Donald E. Westlake's John Dortmunder character from the Dortmunder is a career criminal. He has occasionally used the alias "John Diddums" (he claims to anyone who asks that it's Welsh), a name he dislikes but uses involuntarily in circumstances that preclude using his real name.
- Vanyel from The Last Herald-Mage has a minstrel named Valdir as go-to undercover identity.
- John Clark's go-to alias when operating in Russia or pretending to be Russian is Ivan Sergeyevich Klerk, which patryomnic aside, is basically his name.
Live Action TV
- Even Stevens: Twitty uses Lars Honeytoast when buying shoes from a shady salesman. He uses it again in The Movie.
- Phoebe is practically guaranteed to use the name "Regina Phalange" whenever pretending to be someone else. In "The One Where Joey Speaks French", she gives her alias as a French woman as 'Régine Phalange'.
- Joey apparently uses "Ken Adams" from time to time, but we only see it in action in one episode.
- Parks and Recreation:
- Andy Dwyer used Bert Macklin, FBI agent, in a few scenarios. However, he eventually dies and is replaced by his brother, Kip Hackman. Or so the President's enemies think.
- In the same vein, April Ludgate likes being Janet Snakehole. Originally just the daughter of the owner of the Snakehole Lounge (so she could score free drinks), the next time we see her she's a fabulously wealthy widow with a Mysterious Past.
- It's implied in "Chuck Versus the Break-Up" that Sarah and Bryce are habitually "Mr. and Mrs. Anderson" when going Undercover as Lovers.
- The eponymous Chuck Bartowski introduced the idea of Charles Carmichael (the successful version of himself) in the third episode, "Chuck vs. the Tango". Over the course of season two, it becomes so associated with him that it ends up as one of his operating aliases. In one episode people are congratulating him as both "Bartowski" and "Carmichael" as he walks through a crowd.
- Further down the line, even Morgan gets into the act, establishing Michael Carmichael as his go-to alias.
- On The Office (US), Michael Scott has Agent Michael Scarn. Originally his go-to improv character, eventually the main character of a script he writes and, over the course of several years, films.
- On Doctor Who, the Doctor often goes by the generic "John Smith" when forced to give up a name or being "under cover". In one case he even used the German variation, "Johann Schmidt".
- On Will & Grace, Karen's alias was "Anastasia Beaverhausen".
"Anastasia, like Russian Royalty, and Beaverhausen, like... where the beaver live".
- Burn Notice's Sam Axe always, always uses the name "Chuck Finley" when he needs an alias for the Job of the Week.
- Seinfeld: Each of the male characters has one. In the Puerto Rican day episode, they all end up in the same apartment using their aliases.
- George Costanza has Art Vandelay, who is an architect, a marine biologist, or an importer/exporter, dating back as early as the second episode. He'll also use the name Vandelay when coming up with other lies, such as claiming he was employed by Vandelay Industries. In the series finale, the judge the four are sentenced under is actually named Art Vandelay. George interprets this as a good sign. It isn't.
- Cosmo Kramer would often pretend to be H.E. Pennypacker or Dr. Van Nostrand.
- Jerry himself occasionally went by Kel Varnsen.
- In Plain Sight gives us Mary Sheppard and Marshall Miller.
- On Modern Family, Phil uses Clive Bixby, designer of high-end electro-acoustic transducers, when roleplaying with Claire, who uses the name Juliana for the same.
- Winston from New Girl uses "Theodore K. Mullins", Nick/Schmidt's lover on the down low.
- When he has to go undercover as a criminal, Nash Bridges tends to use the pseudonym Teddy Malone.
- Reese from Person of Interest uses "Det. Stills" and "John Rooney, Assets". Even John Reese is implied to be a fake name.
- On Pushing Daisies, Chuck consistently goes by Kitty Pyms, covering up the fact that she's actually dead.
- On Bones. Booth and Brennan sometimes go undercover. They actually have two sets of aliases, Tony and Roxy or Buck and Wanda Moosejaw.
- Zane on Eureka periodically goes by I. P. Freely, when he's not using the names of WarGames characters.
- Castle has given Alexis some extra undercover work recently, for which she tends to use the name "Clara Stryker," after one of her father's characters.
- Jim Rockford of The Rockford Files typically used the name James Taggart when pretending to be a wealthy businessman.
- Classic Traveller, The Journal of the Traveller's Aid Society #16. Jon "Fast Johnny" McRae is a highly skilled and daring interstellar con artist. One of his favorite aliases is Commodore Laruskaa Korkoran of the Imperial Navy. He has gone to great effort to make it a solid identity that can't be easily exposed.
- The Suikoden series has the recurring alias of Scholtheim Reinbach III/IV. Made much funnier when one of the games actually features the real Scholtheim Reinback III.
- In Planescape: Torment, The Nameless One has the option of using the moniker Adahn when talking to people. And thanks to the nature of the Planes, if you convince enough people that there's a guy named Adahn wandering around out there, you can meet him in a bar.
- Dallas from PAYDAY 2 uses the alias "Nathan Steele" in several of the game's trailers.
- On King of the Hill, Dale likes to go by Rusty Shackleford, generally whenever he's doing something sneaky, although he also refuses to sign his real name to any document, being a comical Right-Wing Militia Fanatic. At one point in the series, the actual Rusty Shackleford shows up—Dale knew him as a kid and had thought Rusty had died—it turns out that Rusty had just moved away and wasn't happy being connected with Dale's various acts of stupidity.
- Daria has "Esmerelda". It only makes one appearance in the series proper when she first meets Casanova Wannabe Upchuck, but she uses it more frequently in subsequent tie-in media.
- Sterling Archer frequently employs the first name "Randy" whenever he's on assignment (the last name varies more frequently). Cyril Figgis has had "Chet" as a cover name more than once.
- Vorkosigan Saga: Miles Vorkosigan spends a lot of time under the alias Admiral Miles Naismith. Part of the series delves into him Becoming the Mask.
- The Stainless Steel Rat, in his criminal days, had a constructed identity complete with false fingerprints, pads that changed the shape of his face, and so on, which he would adopt before beginning any con (and keep up underneath any other alias required for the con), so that the police would spend their time looking for that person instead of the real him.
- The Belgariad: Silk has two primary cover identities in place; the down-on-his-luck spice merchant Ambar of Kotu, and the reasonably successful wholesaler Radek of Boktor. He has others too, but Radek and Ambar see the most play because he likes the characters.
Live Action TV
- Leverage: Sophie Devereaux is the alias by which we know Gina Bellman's con artist.
- Not that the rest of the gang doesn't have standard cover identities. John Rogers says it's to decrease the number of names they have to run by their legal team to keep them from slandering someone. A small selection:
- On White Collar, Neal Caffrey uses Nick Halden as a regular alias when playing cons. Probably because he knows the FBI already knows about that identity; he's had others, but he'd prefer not to give up all his secrets.