->''"I'm a teamster compared to you!"''
-->-- '''Frasier''' (to the former TropeNamer, Niles), ''{{Frasier}}''

When a geeky, stilted or otherwise awkward character steadily becomes more cool, relaxed and [[RoundedCharacter well-rounded]], this character is brought in to fill the vacuum and emphasize the original's new-found coolness.

Compare SuspiciouslySimilarSubstitute, where the original character leaves before being replaced by a similar one; OverAndUnderTheTop, where two characters start out similar but different in degree; and CousinOliver, when a new character is brought in to fill the role of the cute child after the previous one grew up.
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!!Examples

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[[folder:Anime & Manga]]
* In ''{{Anime/Pokemon}}'', May was brought in as a brand new starting trainer, as main character Ash was becoming a bit more mature and experienced with two regions and the Orange Islands under his belt. This would later be repeated when May and her SuspiciouslySimilarSubstitute Dawn meet in the same Pokémon contest in Sinnoh. However, May hasn't ''[[BigEater completely]]'' [[BerserkButton changed]]...
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[[folder:Comic Books]]
* ''ArchieComics'' has CherylBlossom, who was introduced as a MsFanservice-type, but also as a contrast to Veronica, who had undergone enough character development that there was some need for a new version of her. Cheryl is bitchier, richer and skankier than Veronica ever was. Veronica, although certainly being rich, bitchy, and seductive, was never outright ''skanky'', but Cheryl clearly was.
* When MarvelComics made in ill-fated attempt to turn then-popular villain Venom into an AntiHero (despite the character being made of pure NightmareFuel), they decided to fill his vacant villainy niche with an ''[[UpToEleven even more]]'' nauseatingly evil [[SendInTheClones version of the same character]] named Carnage. [[CompletelyMissingThePoint Unsurprisingly,]] Venom failed to catch on as a hero, and returned to villainy very quickly. But Carnage is still around, along with a [[SendInTheClones couple of other symbiotes.]]
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[[folder:Fan Fic]]
* In ''FanFic/MarijuanaSimpson'' Maggie replaces Lisa as the conscientious daughter, while Lisa focuses almost entirely on smoking pot.
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[[folder:Films -- Animation]]
* In ''WesternAnimation/ToyStory2'', Buzz was given one of these in the form of [[spoiler:a newly unpackaged Buzz Lightyear toy. Like the first Buzz, he had no idea he was a toy. This only served to remind our Buzz Prime how annoying and stuck up he'd acted right out of the box. "[[IHatePastMe Tell me I wasn't this deluded...]]"]]
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[[folder:Films -- Live-Action]]
* After the conclusion of ''Film/TheEmpireStrikesBack'' revealed that the seemingly irredeemable [[TheDragon Darth Vader]] was actually a TragicVillain who was corrupted by the Dark Side as a young man, [[BigBad Emperor Palpatine]] joined the cast of ''Film/ReturnOfTheJedi'' as the resident pure evil Sith Lord.
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[[folder: Literature]]
* In ''Literature/WarriorCats'', Darkstripe served as the ButtMonkey until he died at the end of the first arc. When his spirit returned to seek vengeance along with the other villains in the fourth arc, Darkstripe had managed to grow stronger because of all the abuse he had suffered and he actually posed a credible threat. Because of this, another villain called Snowtuft was introduced to be the ButtMonkey, and got pushed around and beaten up by the other characters in all but one of his appearances.
* Minerva Paradiso in ArtemisFowl book five is a child genius attempting to capture a fairy - in this case not a police officer, but a demon. The similarities are all there between her and Artemis, down to the Greek and Roman God names.
* In the second book of ThePendragonAdventure, Spader, a new Traveler, spends the entire book on the same learning curve Bobby had in the first, letting Bobby show off his newfound confidence in comparison. His plot arc even follows some of the same points Bobby's did, down to [[spoiler: Uncle Press dying for him the same way that Osa did for Bobby]]
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[[folder:Live-Action TV]]
* ''Series/{{Angel}}'': WordOfGod states that Harmony is intended as "[[LovableAlphaBitch Cordelia]] ''without'' the life lessons."
* ''Series/BuffyTheVampireSlayer'':
** Watcher Rupert Giles (AnthonyStewartHead) became steadily more relaxed, funny, confident, modern and so on, so in time, Wesley Wyndham-Pryce (Alexis Denisof) was brought in to fill the role of wet, panicky, geeky, trapped in the past, obsessed with manners and decorum, uptight, and having no sense of humour. Interestingly, Wesley then underwent a [[BadassNormal similar]] [[TookALevelInBadass transformation]] as he transitioned from ''Series/{{Buffy|the Vampire Slayer}}'' to ''{{Series/Angel}}'', becoming a fully rounded character in time.
** Similarly, Anya became this for Cordy, who probably underwent the most amount of character development in the entire Buffyverse. Though in this case, most of Cordelia's character development occurred on ''Series/{{Angel}}'', so it was really a matter of her leaving the show and having Anya to fill in that place.
** Andrew Wells was this to the Xander Harris of old.
* In the Franchise/StargateVerse:
** Archeologist Daniel Jackson (Michael Shanks) becomes steadily more physical and cool as ''Series/StargateSG1'' goes on (and the writers run out of allergy and geek jokes). During the episode "Meridian", he is [[spoiler:rendered unavailable/thought to be dead and is]] temporarily replaced by an anthropologist, Jonas Quinn who is essentially the big geek Daniel used to be, and remains an ongoing (intermittent) figure of fun.
** In one episode Robert Rothman was a geekier archeologist when Daniel was temporarily unavailable.
** Dr. [=McKay=] starts out as a recurring ''SG-1'' character who shows up whenever there's a need for a scientist to jerkily disagree with the main characters. On ''Series/StargateAtlantis'', he ''is'' one of the main characters, so he gets some character development and Dr. Kavanagh is introduced to take over the "recurring jerk scientist" role.
* Sawyer on ''{{Series/Lost}}'' started out a JerkAss and developed into a JerkWithAHeartOfGold. In season 4, he exhibits little (if any) jerky behavior at all, but then Miles was introduced and became the replacement jerk. This is lampshaded even before it becomes blatant:
-->'''Miles:''' Where the hell did they go, tubby?\\
'''Hurley:''' Oh, awesome, the ship sent us another Sawyer.
* ''TheMaryTylerMooreShow'': When Mary's friend Rhoda got her own spinoff, she brought along her younger sister Brenda to take on the "less cool friend" role.
* In ''Series/RedDwarf'', Rimmer ends up being his own Replacement Flat Character, so to speak: in the TV series, the "original" Rimmer gradually becomes more fleshed out and -- if not likeable -- [[FreudianExcuse understandable]]. He even shows the occasional moment of bravery, before leaving in series VII [[spoiler:to become "the next Ace Rimmer"]]. Then in series VIII he's resurrected by nanobots as his old, pre-hologram self, and is back to being "you as you used to be" as a disgusted Lister puts it.
** Meanwhile in the book (and less strongly in the episode "Me^2", the contrast is made between Rimmer and the copy of him that hasn't been "mellowed out" by Lister and co.
* After the eponymous star of ''{{Chuck}}'' grew into a confident, competent and somewhat superpowered spy, [[spoiler: his even-geekier best friend Morgan (who had been in the show since the beginning) was brought into the spy team, allowing him to be the same fish-out-of-water adventurer that Chuck used to be]].
* Frasier was introduced in ''{{Cheers}}'' as an uptight, prissy intellectual who was usually the butt of jokes. Over time, he developed and even had his [[DayInTheLimelight days in the limelight]]; for example, the episode "Love Is a Lonely Snipe-Hunter"). Once he was given his own show, ''{{Frasier}}'', and became the central character, he had to become more complex and well-rounded, and his prissyness and bluster were slightly toned down (though still a frequent subject of jokes at his expense). Cue the appearance of his brother Niles, who was everything Frasier used to be and more -- geeky, neurotic, and the butt of (almost) every joke.
* Part of {{Sidekick}} Sergeant Lewis' role in ''Main/InspectorMorse'' was being more lighthearted than the title character. When he starred in the spinoff ''{{Lewis}}'', he took on a more serious stance and was balanced by his own more optimistic sidekick in Sergeant Hathaway.
* ''Series/{{Friends}}'': The originally spoiled, selfish Rachel undergoes character development to become more complex and likeable. In two separate episodes, we meet her two sisters who are still the spoiled, selfish people Rachel used to be. It's revealed that Rachel is the only daughter their father is proud of, precisely because of her development.
* ''{{Glee}}'' often had to bring in new bully characters once the previous ones become too complex:
** For the boys, Puck was the original JerkJock. After he joined the Glee Club, Karofsky and Azimio stepped in to fill the bully roles. When Karofsky underwent his own multi-season story arc surrounding his {{gayngst}} and Azimio was unceremoniously DemotedToExtra, Rick "The Stick" Nelson was brought in and basically served as a contrast to how far Puck and Karofsky had developed.
** For the girls, the Unholy Trinity of Quinn, Santana, and Brittany started off as {{Alpha Bitch}}es, but all three went through massive amounts of character development and were replaced by Kitty when they (well, Quinn and Santana) graduated. Kitty underwent a HeelFaceTurn by the end of season four, and her former role was filled by Bree in season five.
* Jean-Ralphio on ''Series/ParksAndRecreation''. Since the first season, Tom's character has deepened and he's been shown as sometimes being good at his government job, and very serious about Rent-a-Swag. So it's been important to hold onto Jean-Ralphio as the lazy, image-obsessed screwup.
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[[folder:NewspaperComics]]
* ''{{Peanuts}}'': Before becoming the blanket-hugging, gospel-quoting weirdo we all know and love, Linus started out as a baby learning to cope with the world. Rerun was introduced to tell those sort of stories again; however Charles Schulz didn't actually embrace the character until well into the last decade of the strip.
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[[folder:Western Animation]]
* On ''{{WesternAnimation/Futurama}}'', Fry's ex-girlfriend Michelle wound up freezing herself after Fry himself was accidentally frozen and woke up in the year 3000, but unlike Fry, who adjusted to the future surprisingly well, she had a lot of trouble with it and eventually hooked up with an also recently-thawed Pauly Shore. WordOfGod says that one reason they did this episode was because they realized that the original concept of Fry being a FishOutOfTemporalWater not only hadn't really worked out but if anything he functions ''better'' in the future than in the 20th century.
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[[folder:Web Animation]]
* In ''WebAnimation/HomestarRunner'', Strong Sad has become much more strong and confident, losing a lot of his {{Wangst}} and occasionally getting his own back on Strong Bad. Therefore Coach Z and the King of Town have filled in as "pathetic losers" in his place.
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[[folder:Web Original]]
* ''[[http://www.gamearena.com.au/ Gap]]'': Tom was originally somewhat uptight and nerdy, but eventually became the relaxed character of today, and had his role filled by David.
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