Damian Wayne was this for a while. At first fans couldn't stand his snide attitude, the massive amounts of lenience that he seemed to get for things that some fans found unforgivablenote beating up Tim Drake, and beheading a D-List villain to name a few but Grant Morrison kept using him in his stories. When he eventually became the Robin to Dick Grayson's Batman, many fans complained, but he mostly won naysayers over with him as the "dark, snarky" Robin that Jason Todd failed to be during his tenure (helped greatly by a massive amount of Character Development). Now, with his long-delayed death finally occurring, more fans are begging for him back than cheering with joy.
Jason Todd as well, and for many of the same reasons. His characterisation since coming back from the dead changes depending on the writer, which makes it seem like DC is just doing anything and seeing what works. The attempt at darkening him has him do things that no other Bat-character could get away with, such as casually killing (emphasis on the casual) and using guns (Peter Tomasi did however write him as going for leg shots in front of Batman), while having the negative personality aspects of Damian, but none of the charm, nor the excuse of being a child.
Inverted by Cassandra Cain and Stephanie Brown, characters who are well-liked by the fandom, but whom DC editorial seems to want to have nothing to do with.
Part of the reason for this makes Barbara Gordon a Creator's pet. Barbara is a popular character, as Handicapped Badass Oracle. Crippled by The Joker in The Killing Joke when she was no longer Batgirl, there was backlash at being so cruelly sidelined. She was then given a second life as a hacker and proved to be both incredibly useful and an inspiration to people in real life. Returning her to being Batgirl in the New 52 at the expense of her popular successors of the Batgirl mantle, Cassandra Cain and Stephanie Brown sours many fans of her. It's pretty much the same situation as Barry Allen, since she is now back and those who took up her legacy as Batgirl have been swept under the rug.
When Scott Snyder was told he couldn't use Cassandra Cain in his Batman run, he created a character named Harper Row. Harper appeared in two issues of Batman (a split-second cameo and A Day in the Limelight) before being billed as a "fan-favorite" for her next appearance. While she was positively received, "fan-favorite" seems to be stretching it. When Damian Wayne died and left the Robin slot vacant, she was immediately pegged as the next choice to fill the slot— although this may end up going to Carrie Kelley, a female Robin from Frank Miller's The Dark Knight Returns... supposedly from Batman's future. Who is a much more likely candidate for the title "fan-favorite."
Similar to the example regarding Cass and Steph, Dick Grayson. Easily the most popular character to have been Robin, Dick is a HUGE fan-favourite, who Dan DiDio seems to hate with a passion, to the point where he wanted to kill him off in Infinite Crisis. Luckily, Geoff Johns stepped in with Superboy as his Sacrificial Lamb. But even after that, he refuses to let Dick lead a happy life, and made it a point to completely ruin his life in Forever Evil.
The Flash has Barry Allen, the second Flash. Barry pulled a Heroic Sacrifice in Crisis on Infinite Earths (a crossover from the 1980s) and this lead to his sidekick, Wally West, taking up the mantle of the Flash. Wally quickly became a fan favourite and eventually universally accepted as the Flash, and was also featured in the DCAU. Fast forward to the late 2000s, and people who grew up with Barry are Running the Asylum, including Geoff Johns, who has actually said that Barry is a favourite character. So, of course, Barry returns, usurps Wally (who by that point had been the Flash for over 20 years) as the protagonist of the Flash ongoing, and is shilled as the best Flash, to the point where it is said that, since his death, crime has gone up massively. This is despite the fact that Wally is clearly established as being faster than Barry. Then, Flashpoint happens, and Wally is rebooted out of existence, and Barry is established as being the only Flash. All this despite pretty much nobody wanting Barry back.
Even in Justice League: Doom, an animated adaption of a JLA storyline wherein the Flash was Wally, the Flash is Barry. The plot would be no different if the Flash was Wally (in contrast to switching Kyle out for Hal, which at least made sense with the villainous counterpart they used).
Most fans cite Flash: Rebirth as blatant Running the Asylum. The difference between it and Green Lantern: Rebirth, is that Barry's death was a heroic sacrifice and he was well-regarded by people in the DCU, and the guy replacing him was his sidekick, who was already an adult while still being called "Kid Flash". Hal pulled an extreme Face-Heel Turn and turned into a villain, and was hated by most people in the DCU, and was unceremoniously replaced by a minor character. With Green Lantern, it was fixing something that was clearly broken. With Flash, it was blatant favouritism on part of the heads of DC.
Dwayne McDuffie had Green Lantern John Stewart, though this was largely part of self-fulfilling prophecy; a lot of fans didn't like Stewart for the way he leapfrogged Kyle Rayner (previously established in the animated canon) and longtime comic GL Hal Jordan to be the Justice League Unlimited Green Lantern. This led to McDuffie (a black creator who was quite vocal on what he felt was racism within the TV and comic industry, and who had inherited Stewart on the cartoon from the previous showrunner) making some comments equating hatred of Stewart as racism, which led to the widespread notion that Stewart was McDuffie's pet character.
Fast forward a couple of years when McDuffie took over the Justice League of America comic and he was told to use John instead of Hal as the Justice League of America's Green Lantern on orders from above (partly because Hal was being given HIS JLA TEAM!). Sadly for McDuffie, fandom took the change badly, not helped in the least by the fact that Hal's JLA spin-off was delayed and reduced to a mini-series when it became apparent that James Robinson's artist was never going to get the book done on time. This lead to Hal returning to the title until his book was ready, followed by John's re-instatment just long enough for him to be bounced again and replaced with Hal until he was quickly replaced with Jade when they needed a book to focus on her Brightest Day storyline. The entire process was made progressively worse and worse by Executive Meddling, in case you couldn't tell. And when McDuffie had the gall to describe this and the other creative difficulties on his forum (without assigning blame or complaining), DC responded by firing him.
One could argue that the Green Lantern has been a source of shilling the creator's pet since the 90s. Start with Kyle Rayner replacing Hal Jordan and the writers trying to shill him to win over the fan base disgusted by Hal's Face-Heel Turn in Emerald Twilight. Fast forward 10 years, and a number of those fans are now writers/editors for DC, and they promptly retcon the heel turn and restore Hal to being GL Numero Uno - and now must shill him to the fan base who grew up with Kyle and are upset with him getting booted down - and John Stewart as described above.
Interestingly, a few writers did make Kyle work for his place in the DC Universe. A number of writers, like Grant Morrison, had characters like Wally West look down on the rookie Lantern for just being there and made to bust his chops to earn his place in the greater scheme of things.
Magog was used constantly in Justice Society of America to the point of absurdity. By the end of Geoff Johns' popular run on the book, he was a reasonably popular character (and an homage to DC's legendary book Kingdom Come), but with the new creative team, he became the most important character of the book (despite it having a cast of over twenty characters by this point). Despite fan complaints, Magog soon got centre stage on most of the covers, got to co-lead one entire JSA team on their own book, and even got his own solo series, despite him being a nobody even a couple years before that! The backlash was tremendous, and his hilariously-low-selling book was cancelled quickly, his storyline wrapped up, and the character unceremoniously killed off in Generation Lost by Max Lord, to prevent Magog from creating a future similar to the original story he originated from.
Supergirl suffered from this hard in the mid-2000s. Basically, for nearly twenty years, the "Superman's cousin" version of the character had been unused, with various other characters filling the mantle (more than a few of which came out as Replacement Scrappies). Suddenly, in the pages of Superman/Batman, DC debuted a character with the same origin as the classic Kara Zor-El, and went on to firmly sweep any traces of replacement Supergirls under the rug. However, the new Supergirl turned out to be a massive Jerk Ass with a spoiled, entitled attitude and a nearly-Stripperific outfit, who would go on to beat up a lot of more likeable characters (mostly heroes) for reasons that seemed to mostly consist of "show off how awesome Supergirl is." Nonetheless, Superman gave her carte blanche to run around using his insignia, and she was often described as being even stronger than him (a fact so nonsensical it was later retconned). She appeared in every book from Justice League to Teen Titans to Legion of Superheroes to her own ongoing series, and never seemed to fit in any of them, giving the impression that DC had no idea what to do with her. It would later come out that the editorial staff loved Kara Zor-El, and wanted her to keep being in comics, but fans of the original squeaky-clean Kara disapproved of the new one's attitude, while fans of the replacement Supergirls (particularly the fairly well-characterized Linda Danvers) didn't get why this jerk had taken the spotlight. By the time of the New 52, though she'd straightened herself out a bit and DC had stopped shoving her everywhere, the Post-Crisis Kara Zor-El was considerably less popular than Power Girl, her own alternate universe counterpart.
Danny Chase from DC Comics' New Titans was universally loathed by fans within a few issues of his first appearance. He was a Cousin Oliver (he even looked like the original Cousin Oliver) introduced to make the team seem younger, as he was only in his early teens while everyone else was pushing 20. Despite his age, he constantly argued with the other members of the team, criticized them, was supposed to be a genius superspy teenager with telekinetic powers, but then went crazy with fear whenever an actual fight took place. And when Dick was distraught at the death of Jason Todd, Danny said it was no big deal because Jason 'knew the risks'. The only person who didn't seem to grasp how loathed this character was was writer Marv Wolfman who, to this day, still insists it was the readers' fault for not "getting the character," and Linkara, who calls Danny his favorite Titan in his look at the Titans history during March 2013.
As a tip, in a series about costumed superheroes with codenames, whose fans presumably enjoy reading about costumed superheroes with codenames, having a character who continually goes on about how lame costumes and codenames are and how he's too cool for a costume or codename probably isn't going to go down too well.
It also hurt that Marv Wolfman had no idea how to write a telekinetic to complement the Titans' diverse power set. Chase's powers were mainly shown to be (at best) extremely limited: at best he could levitate himself (but only while sitting Indian-style) and throw small objects around at bad guys to annoy them. Jean Grey he wasn't; this combined with his wussy behavior during combat, made him practically useless in battle. As bad as Cypher was power-wise, at least he had training in hand-to-hand combat and was willing to take a bullet for his teammates when necessary.
The second Wonder Girl, Cassie Sandsmark, was felt to be this after she became team leader in Teen Titans volume 3. While talked up as a leader by the writers, Cassie didn't really do all that much and more page time was often given to her acting obnoxiously condescending or being a Jerkass to her boyfriend. Fans also felt insulted when Felicia Henderson brought Beast Boy back to the team: Rather than give him his leader role back, Henderson had Cassie continue to be leader while lacking any character development, while the older and more experienced Gar was demoted to obnoxious comic relief and treated as if he were younger.
Roger Stern really liked Monica Rambeau, the Captain Marvel of The Avengers, and actively pushed her into the limelight. He repeatedly had other characters talk about how powerful she was, men gushed over her beauty, and she was even made chairman of the Avengers for a time. The fans never quite took to her, but she was never really hated. She did develop a larger fanbase once Warren Ellis made her a member of the Nextwave series.
Apex from Avengers Arena is this in the eyes of many critics. She is supposed to be one of the smartest people on the Murderworld, but so far she was only successful because everybody she went against grabbed Idiot Ball much bigger than the one she's carrying around and because stronger characters have been subjected to The Worf Effect to make her look cooler, especially Darkhawk - she can effortlessly take control over his armor and even break its bond with the host. Once her plan from the first arc blows in her face, it's treated as a big accomplishment by the other side, literally being said to be beating her at her own game, despite the fact she made many stupid mistakes that lead to her failure - many people see it as Character Shilling. Many plot points ends up revolving about her, even if they shouldn't like broken trust between Chase and Nico. In second arc she kills Juston, takes control over his Sentinel, Deathlocket and Dawkhawk and uses them to effortlessly curbstomp X-23 and Nico Minoru, effectively dominating every established character, who could be seen as big treat, and is only defeated thanks to writer breaking rules under which Nico's magic work to give one of them necessary powerup to fight her off. Also, Deathlocket, one of series initial Ensemble Darkhorses has been turned into satellite character, that only exist to make Apex look that much more interesting. Apex is also the only character to get more than one focus issue issue #9 which tells her origin, and issue #12 which is told from her perspective, while some established characters (like Mettle, Red Raven and Juston) haven't got a single one before they died. Few critics of the series started calling her Neelix to express how annoying she is.
Cammi is another one - while nobody denies she is an experienced survivalist and Badass, she is also set up as an unquestionable team leader in second arc and other characters, including those who actually are experienced leaders (Nico Minoru, Reptil), follow her without a question and even ask what they should do in situations which they should be better suited to handle in the first place. And worst of all, she keeps this position despite making stupid decisions and when Cullen finally calls her on it, it's treated as him having emotional breakdown, not pointing out how an horribly incompetent leader she is.
Other Braddock Academy kids, especially Cullen Bloodstone and Anachronism, are this to certain point too, because, with exception of Cammi, other characters rarely get a chance to show any initiative and are constantly Demoted to Extra and subjected to Worf Effect to make them look better.
And of course Arcade is one too, being portrayed as genius who managed to outsmart everybody in the Marvel Universe to have his sick game run for a month without anybody noticing, while in reality his plan worked only because everybody who could stop him have been either handled Idiot Ball or written as uncaring jerks. We're supposed to see him as clever mastermind who manipulated the cast into fighting each other to death for his amusement, while in reality he needs to make one ham-fisted interference after another to try make kids play his game, clearly showing he didn't think his plan through, and with three exceptions, two of which doesn't really count anyway Apex, who was already playing without his push, and X-23, whom he can get to play if he sprays everybody with Trigger Scent, that sets her into state of uncontrollable rage, which cannot be counted as playing on her own will, all of them failed. In the last arc, when everybody starts fighting each other, it comes out at happening only because Arcade claimed he broke those kids. There's only one that has been lead naturally to the point where he has understandable reasons to try to kill somebody else Aiden trying to avenge Nara. Others not only don't have one, but one of them Nico Minoru experienced things that make her suddenly trying to kill others make no sense whatsoever she died and came back to life to save the same people she now suddenly tries to kill - it comes out as Character Derailment for the sake of validating Arcade's claims. It also happens after Arcade rants in defense of making the game last thirty days, which looks like Dennis Hopeless putting words in his mouth in defense of commonly criticized plot point.
The Red Hulk under Jeph Loeb, dear lord... shortly after being introduced he beat odin-forced Thor with his own hammer, punched out the Watcher, killed the Grandmaster (who is immortal), casually killed off the whole Defenders (including the Silver Surfer!) and much more. Luckily, he got depowered when Parker took over, and every hero that has been beaten by him before returned to return the favor in some very satisfying ways.
The Sentry from Mighty Avengers, Dark Avengers, Age of the Sentry, World War Hulk, Secret Invasion, Dark Reign, Siege, Fall of the Hulks, New Avengers, and The Sentry mini series. Writers love using him, fans hate seeing him. If they wanted to see Superman with mental problems, they would've just gone to Superdickery.
The Good News: He's finally dead! The Bad News: despite being utterly useless for most of his comics existence and a Face-Heel Turn that also revealed he was an Eldritch Abomination and saw him try to destroy the world his send-off issue was nothing but the entire cast of Marvelverse heroes waxing poetic about how wonderful he was and how he'd made their lives better in flashback retcons. The hamfisted attempt at Alas, Poor Scrappy was not well-received.
He's also an example of a God-Mode Sue. He's better at molecular manipulation than Molecule Man , for instance (it is debatable as to whether this was the Sentry or the Void, an issue even further complicated by the fact that no one really knows what the hell either of them are). All this may come with the territory, given that he's heavily implied to be Death and all that...
He's a perfect example of an interesting character/idea turned into a walking plot device.
Mary Jane Watson-Parker of the Spider-Man comics is an inversion: Most of the fans like her and want stories featuring her, while creators (especiallyJoe Quesada) hate her and are willing to ruin the franchise to get rid of her. This might be because they were readers when they were young, when MJ became the target of Die for Our Ship from Gwen fans following Gwen's death, and MJ and Peter's marriage became a Base Breaker move. As MJ went through massive amounts of character development and became a much more beloved character, a combination of lazy writers using her in uncreative ways during the Clone Saga and old hatred of her and/or the marriage led to people like Quesada gaining control over the writing.
Carlie Cooper of the same series, however, has been playing this frustratingly straight:
Introduced at the start of the BND reboot, she was quickly established as being Peter Parker's next love interest. Initially she started off as a minor character who just happened to have a crush on Peter, but recently writers have been cranking it up how much she's perfect for Peter, having both Peter complain about not being worthy of her and Mary Jane telling him he needs to hook up with her. Oh, and did we mention she's named after Joe Quesada's daughter?
Also, she's coming off as a Composite Character to many. Tries hard to invoke the Nerds Are Sexy trope, presumably so that she's "on the same intellectual level" as Peter or some such nonsense? Deb Whitman. Has a tragic past involving her father (really, couldn't even make it the mother? Or another authority figure?), that really doesn't come off as being as bad as MJ's was. Touted as being the "perfect girl" for Peter, being idolized (this time by people in-universe, as opposed to in fans' memories). Gwen Stacy (fans hope she will complete this set by dying) Falling in love with "plain ol' Peter Parker?Mary Jane again.
However, there's a light at the end of the tunnel: the recent Spider-Island storyline ends with Carlie breaking up with Peter precisely because he didn't tell her he was Spider-Man, while Mary Jane gets closer to Peter. The comic also focuses on Carlie's negative traits and MJ's positive ones: when people in New York start developing Spidey's powers, Carlie uses hers to play around while MJ helps Peter and the Avengers fight the Big Bad.
Unfortunately, she's still not going anywhere anytime soon. Despite having had broken up with Peter, Carlie is still sticking around in the book. In addition, she's starting to pop up in other books like the Punisher. Not only won't she go away, she's being featured in more titles despite an utter lack of enthusiasm on the part of the readers. And if you were thinking that she'd be portrayed in a negative light, the creators insist that she - out of anyone else in the books - is perhaps the "sanest" member of the cast.
Oh, and let's not forget, in Superior Spider-Man, she is the first person to figure out that Peter is obviously acting incredibly out of character and decides to investigate. Not Mary Jane, the love of his life. Not Aunt May, the woman who raised him. Not even the freaking Avengers, who have fought side by side with him for years! This woman is the one who figures it out, in the most simple way possible. You want to know how? She follows Spidey's money trail that he's using to pay for his minions and gear, and it belongs to Otto Octavius. The main character, who many criticize for being a Villain Sue, made that stupid a mistake, and yet nobody figures it out but Carlie. Even worse, when she gets hit a dose of the Goblin formula, she's the only one who can resist it's brainwashing powers. At least she maintains noticeable scars on her eyes after she gets cured.
Many detractors towards Dan Slott tend to paint his usage of Spider-Man villain Doctor Octopus as this, especially after he became the Superior Spider-Man. A major complaint by fans toward this end is that Otto's thus-far-successful attempt at hijacking Peter Parker's life has less to do with him being clever and strategic, and more with all of Peter Parker's friends, allies, and family becoming total, brain-dead idiots, with the plot at times bending over backwards to keep Otto from getting egg on his face.
Thanos of Titan and Adam Warlock have fans, but readers find Thanos' continual presence at the center of crisis crossovers annoying, along with the fact Jim Starlin will delete or handwave less glamorous showings of his pet Thanos, unless the reason for them was his other pet Adam Warlock. This is also part of the reason Squirrel Girl has fans because she was part of a gag that parodied Thanos' uber-competence and the tendency for his screw-ups to be explained away as inferior clones or part of his plan.
Many of Thanos' fans like him for being a vile villain, but don't like the attempts to make him seem sympathetic despite hardly doing anything sympathetic ever. He routinely kills billions of people and not just in A Million is a Statistic ways but takes much joy in causing as much suffering as he can individual to individual. We're supposed to feel bad because he's in love with the personification of death and was rejected when she realized he was no good.
Most Thanos fans enjoy Thanos not from his original appearances, but from the 90s, when he was a Deadpan Snarker and someone who sought to save the universe not because it was the right thing to do, but because Thanos pissed off Death and doesn't want to even contemplate what would happen to him if the universe was destroyed since Death won't let him into the afterlife.
This created a bit of irony of sorts, as Thanos received a great deal of character development from Starlin in the 90s at the expense of Adam Warlock in terms of Warlock being reduced to Thanos' emo sidekick.
Some characters in his Avengers comics - Spider-Woman, Luke Cage, Jessica Jones and Ares - are accused of being Creator's Pets. There is some balance though, because Bendis has a tendency to showing his affection by heartlessly breaking them, so all five went through some serious crap under his care. But for many fans it's still not enough to equal all the attention he gives them. And that's not counting Bendis' "love" for Hawkeye, who has become nothing more than a vehicle from which Bendis attacks his critics (and to spite fans whose overwhelming hatred for Bendis' attempt to permanently kill Clint off led to Bendis being forced against his will to bring him back to life, at which point he turned him into a ninja to further spite fans).
Nurse Annie Ghazikhanian in Uncanny X-Men. Universally maligned "writer" Chuck Austen introduced the single mother/apparent expert in mutant physiology shortly into his equally despised run on X-Men. Word of God stated she was based on Austen's real-life wife, never a good start. He quickly made her the inane central character in many of his story lines. This usually included:
Vapidly gossiping about sexy men with once-intelligent characters Husk and Northstar.
Throwing tantrums/acting holier than thou during battles and various X-Men crises.
Dispensing shallow advice to other characters on their "romantic woes".
Wrapping bandages around injured characters' heads (regardless of their actual injury)
Apparently boning Iceman for no apparent reason.
Annie is mostly remembered for her creepy relationship with Havok, which started as a crush when she was caring for the longtime X-Man whilst he was in a comatose state. Once revived, Alex showed an immediate and unfounded attraction for Annie also. It was eventually revealed Annie's equally creepy mutant son Carter had been setting the two up on 'psychic dates' for months, allowing Austen to place the two characters in a relationship without needing to bother about annoying things such as context or developing a rapport between the characters. To further infuriate and confound readers, Austen also depicted Havok's longtime partner Polaris as an insane, homicidal, bitchy ex to further drive home the point that Annie was The Virgin Mary and Gandhi rolled into one.
Fan reaction to Annie (and Austen's run in general) was overwhelmingly negative, a fact that the writer dismissed as unreasonable "trolls". With his final story arc with the X-Men franchise, Austen wrote Annie and Carter out of the X-Men books. The pre-Austen Polaris/Havok relationship was restored in time and Annie was never mentioned again, presumably dying on the way back to her home planet and/or country.
Quinten Quire started off as a minor character, basically the super-powered mutant equivalent of a school shooter and a teenaged sociopath who manipulated others into joining a small cult of wannabe Magnetos, before dying of a drug overdose of sorts. He was revived a few times, before finally returning during Schism, serving as one source of the conflict between Wolverine and Cyclops to push them apart further, before joining Wolverine's school. He's continued to be written by Jason Aaron, who's since then made him one of the main characters, including being the main student, of his run, with him being at the front of every big event he writes, including his future self being the Phoenix in Battle Of The Atom. All of this, despite being largely loathed by vocal aspects of fandom. Every writer tends to have one kid they push, and usually it works. This case, however, it most certainly has not, and isn't helped by his continued use.
X-23 gets hate for this too. Being a teenage Opposite-Sex Clone of Wolverine, she is everything everyone hates about him, with very few of his redeeming qualities like wisdom and compassion. Instead, she comes across as an antisocial jerk, and yet the writers fight themselves over who puts her in what. Her role in New X-Men in particular, once her creators Craig Kyle and Chris Yost took over the title, you could be forgiven for thinking was written by a thirteen-year-old girl. She's portrayed as having New Powers as the Plot Demands, usually something related to animalistic senses, that enable her to figure things out before anyone else, as well as ten times the competence of the other kids with none of their charm coming with the territory of being inexperienced teenage superheroes. As the final punch to the gut, she hooks up with the hot bad boy character after his original love interest is clumsily written out. And it didn't do her any favors that the original main characters of the series were either unceremoniously killed off, written out or demoted to extra to make room for X-23 being the primary focus. This is ironic, given that she was initially an Ensemble Darkhorse when she originated on X-Men: Evolution. Perhaps it's the fact she has poor characterization these days while being a regular (always a failure of a combination for any character).
For reference, any time Craig Kyle (one of her creators) has done writing for comic books, she is a main character. The only exception is his Amazing X-Men, wherein he can't use her, since All-New X-Men, the flagship X-Men book written by Brian Michael Bendis (both of which have priority over Amazing), is already using her and she absolutely cannot appear in Amazing X-Men.
Chris Claremont, while a beloved writer, is quite notorious for this, particularly with female characters. On several different occasions, he has championed the cause of one X-woman or another, often putting them to the forefront, and continually using them on different books. This isn't entirely negative, as many of the women turned into great characters, but started rubbing fans the wrong way when Sage was shoved down fans' throats upon his return to the X-Books. Suddenly this character (who'd only been "Sebastian Shaw's Secretary/Assistant" before this) was everywhere, getting constant cover appearances, saving the day, and becoming central to several stories. Despite no fans really liking her, Claremont used her again and again in subsequent books, as every time he got taken off one series, he'd transplant her to his new one. This got most egregious when the mainstream Sage ended up in Exiles, which almost always used Alternate Universe versions of mainstream characters.
The same thing in regards to Claremont's writing of Psylocke, as he had her placed on the Exiles and had her actually usurp leadership of the team away from Blink, who is a very big Ensemble Darkhorse.
Steve Englehart became notorious for his over-use of the character Mantis in his The Avengers run. She appeared, beat the snot out of all of the Avengers at once, and then immediately became the central character in a huge Myth Arc that took up years of storytelling. Then, when he was out of Marvel, he created a Captain Ersatz for her in DC. Then another company. Then tried to use her again at Marvel. To date, he is the only writer to ever seriously use her as a major character (a few writers have gone on record that they hated the character behind-the-scenes, and didn't see what Englehart saw in her) — her next-biggest appearance is likely as a seventh-tier "Home Base" character in Guardians of the Galaxy.
Orlando becomes this in The League of Extraordinary Gentlemen: Century, where he/she usurps all of the attention away from Alan and Mina, the only two original members of the League left.
The Silent Hill comics had more than their fair share of problems, but worst of all was the addition of Christabella, a Creepy Child who commands an army of monsters and constantly spouts off curse words and wisecracks in a manner befitting Freddy Krueger. Not only does her inclusion run completely contrary to the plot and mood of Silent Hill, but Dead/Alive ends with her give complete control over the town, when most readers would have preferred to see her fed to the Slurper.
At least she was forgotten when Tom Waltz took over the writing chores of the comics.
In the Sonic the Hedgehog comic, a character was introduced named Tommy Turtle, a childhood friend of Sonic that had never been mentioned before, but had once taught him a valuable life lesson. He died in his first appearance while performing a Heroic Sacrifice to save Sonic, but about a year later was revealed to not have actually been killed and was brought back. Unfortunately, after bringing him back, the writers didn't seem to have any real idea what to do with him, and attempts to make him more relevant (such as having him become infested with nanobots, causing him to develop Transformers-esque abilities) ended up just appearing ridiculous and making fans hate him. In Sonic Grams while Archie staff admitted that they knew a lot of their fans hadn't liked the character, they'd hoped they could change their tune, showing the clear divide between the staff at Archie at the time and the people actually reading the book. In the end writer Ian Flynn said when compiling a list of the comic's most unpopular characters, Tommy still ranked very high among the fanbase despite efforts to make him popular by previous writers. Tommy was therefore killed off (performing anotherHeroic Sacrifice) and hasn't been seen since.
Different writers have met criticism over over usage of certain cast members. Ken Penders was noted for his expansion of the Echidna brotherhood, which by the end of his run had its population and story background bloated to a convoluted rate. This treatment did not seem mutual with later writers, who decided to limit their numbers and had numerous Echidna characters Killed Off for Real. Ian Flynn however has been noted for his recent usage of Sally Acorn, reestablishing her as an active Freedom Fighter and love interest for Sonic and giving her a fairly notable role in nearly every arc (ranging from main character to prominent supporting character). Granted in both cases there are still a fair amount of supporters, though it's obvious the fanbase is very polarized by their heavy usage in the comics.
To be fair of Sally, up until Ian took over, Sally had been through a major Chickification during the comic's Dork Age, so trying to reestablish her as an Action Girl once more through heavy usage is probably sensible. However, Sally, under Ian's and everyone else's pen, gets rather consistent flak for over usage at the expense of other characters and being a rather clear-cut case of Positive Discrimination. She garners complaints for being blandly lucid and hyper competent (with her flaws being much more superficial than the other characters' flaws), and for her role as The Straight Man to Sonic. The fact that Ian released a blog consisting of nothing but how awesome a character Sally is doesn't help much.
If you want to get technical with the usage of Knuckles and the echidna expansion, consider the following: Ken Penders has stated, flat out, that he doesn't use characters that people created and, in turn, considers things that people do to his own characters non-canon. He has admitted that the first character that he used that wasn't his or already pre-established was Mina Mongoose in issue 150note which isn't actually true, as he'd apparently forgotten his use of Mammoth Mogul early in the Knuckles comic and proclaimed that, if he were to return to the comic, he would automatically make all of Ian Flynn's work non canon because they went against his pre-established ideas. If that doesn't scream "Creator's Pet", nothing will.
Here's one more: Penders has stated that Archie can his characters again if certain conditions are met, one of them is making his Mobius: 25 Years Later story the canon future of the book. Aside from that story having Knuckles be the one the ultimately kills Eggman and the Sega characters getting married off, it's also a prequel to The Lara-Su Chronicles, a story that Penders is working to get published through a different company and stars Knuckles' daughter. Thing is, Penders can only publish TLSC if it doesn't resemble the Sega-Sonic art-style and isn't tied directly to the Sonic books. So the condition about25YL is nothing than forcing his vision on the book for personal reasons.
Drift from IDW's Transformers comic hit this status before he even debuted because the promotion of the character was so obnoxious. He was hyped up at conventions as "The Wolverine of Transformers," which struck many fans as odd because Grimlock has a lock on that role. Drift has a Weeaboo vibe thanks to the rising sun motif and Gratuitous Japanese on his car mode, as well as being described as a "drift-racing Transformer" created because he filled a niche no other character could (never mind the Loads and Loads of Characters in Transformers and the fact that at least one drift racer already existed). He boasts Implausible Fencing Powers, an annoying arrogant smirk that never goes away, and copious shilling from fan-favorite Kup. He debuted alongside the Wreckers, a group of well-loved badasses, with no explanation except that everyone thinks he's so awesome. There are even instances of characters asking where he is when he's off screen. Oh, and did we mention that he's some sort of mysterious wild card who is not really an Autobot but is trusted by Kup and company anyway? Essentially, he's a heavily promoted character who is cool because the comic tells us he's cool and lets him curb stomp scary Insecticon drones (while wearing that Primus-damned smirk) and impress the actually likable characters. The similarity to The Simpsons parody of Creator's Pets has led Transformers fans to start a meme of quoting "The Itchy & Scratchy & Poochie Show" in reference to Drift, hoping desperately that his home planet needs him and that he dies on the way back.
Shoehorning Drift-chan in the children's "I Am Optimus Prime" Robot Heroes book sure doesn't help his case any either. And he does nothing, he's just there because we're supposed to believe he's awesome. The Transformers Wiki even gives as picture captions, "He's your horrible fancharacter." and "Seriously, you made this guy up when you were eight."
One of the biggest problems with Drift is that he's not only writer Shane McCarthy's awesome fancharacter, he's also become editor-in-chief Chris Ryall and editor Denton J. "Doubledealer" Tipton's pet character. Hence his inclusion in the children's book "I Am Optimus Prime" (ensuring kids reading the book would remember the awesome character that IDW invented) and under Tipton's penmanship, ended up having his horrible advice taken by Perceptor over the veteran, experienced Kup's more sensible advice, abandoning science in favor of becoming a dull "sniperer".
And yet, to everyone's great surprise, his role in the new ongoing More Than Meets The Eye has managed to overcome a lot of the hate he generated under less competent writers. He get's some holes punctured in his incessant moralizing, his spiritualism is written with a more humorous air, his backstory get's some nuance to it, and has some horrible consequences of his well intentioned actions coming back to bite him in the ass and leave him cast adrift. Even the Transformers Wiki admits he's a much more tolerable, if not outright enjoyable, character.