This may have been a factor in the failure of Robert Kirkman's very well-written Irredeemable Ant-Man series. At the time there were two Ant Men; Hank Pym, the original Ant-Man, and Scott Lang, the second to use the name. Irredeemable was about a third, brand-new character, Eric O'Grady. It didn't help that Eric O'Grady starts the comic as an unlikeable dick (he gets better) and fans were still pissed about Brian Michael Bendis having dropped a bridge on Scott Lang. This seems to be decreasing with time as later books (like Thunderbolts and Secret Avengers) have furthered Eric's Character Development resulting in him becoming a snarky and likable Jerk with a Heart of Gold. In fact he seems to be slowly becoming an Ensemble Dark Horse, so much so that fans were enraged when he seemingly died in Secret Avengers.
Pretty much everything about the Avengers Arenabase is broken, but a good segment loathes the new characters from the Braddock Academy out of fear that established characters (such as poor Mettle) will be killed so they can have more screentime.
Quite a number of Cable fans hate Kid Cable, the younger version of Cable introduced during Extermination (2018). The character was introduced by having him murder the older Cable, and is young enough that he's been called a teenager in-universe, when a big part of Cable's appeal is that he's a grizzled old soldier. Not helping is how this younger Cable outright says that Cable "got old" before killing him and repeatedly exclaims that he himself is Cable. Many are counting down the days until the adult Cable returns and Kid Cable leaves, to either grow up into his adult self or die. To make matters worse, the Summers/Grey Family and X-Men forgive Kid Cable for murdering the original Cable, and effectively replace old Cable with him since he's supposedly the same person. As such, the only mourning the original Cable really gets is in a one-shot where it's mostly Hope Summers being angry, and his own mother Jean Grey preventing her from using his time travel device to go back and save him, and the original X-Force crew reuniting to avenge him — and X-Force is presented as wrong for wanting to do this.
Averted with Bucky Cap. When Cap's old sidekick Bucky took the mantle after Steve Rogers' death, his portrayal was done successfully and he was widely accepted by the fans. To the point where Steve Rogers' inevitable return disappointed many fans that had grew accustomed to BuckyCap. Possibly because of this, even after Rogers came back, he declined to take up his shield again and let Bucky continue to be Captain America for a while.
Similarly, The Falcon becoming the new Captain America in 2014 is not particularly hated by anyone. While some fans were disappointed that Bucky wasn't returning to the role, the majority of readers looked forward to Falcap. The problem that many have with it is not with Falcon himself, but rather with the writing of his tenure itself, as Rick Remender's run was not well-received at all, and is loaded with Unfortunate Implications, while Nick Spencer was known to take swipes at any detractors of his run, very unsubtly include political commentary and turning Steve Rogers into a Nazi with a Cosmic Retcon. Many are sad that Falcap never got a fairer shake.
Kade Kilgore's Hellfire Club, main antagonists of Jason Aaron's Wolverine and the X-Men (Marvel Comics). In fairness to Aaron, the classic Hellfire Club members (and most of their direct replacements, too) are long dead or face-turned, but apparently he felt that the best characters to fill their shoes would be a cabal of sociopathic teenagers with a major Show, Don't Tell problem; they spend most of their panel-time talking about evil things that they did which we never see them do. They're typically referred to by derisive nicknames like "Heckfire Clubhouse" or "Hellfire Babies."
When Chris Claremont returned to the X-Men in the early 2000s, he created a number of new antagonists for them to fight, such as the Neo, the Shockwave Riders, Vargas, the disembodied telepath Elias Bogan, and a mutant slavery ring led by an alien named Tullamore Voge. None of these characters were particularly well-received, and most of them got a good deal of unnecessary Character Shilling comparing them favorably to the established villains - Apocalypse considered the Shockwave Riders Worthy Opponents, Bogan was said to be the ultimate head of the Hellfire Club despite never being mentioned before, and so on. It's probably telling that any time a writer other than Claremont has used one of these characters, they're shown being defeated in an amusingly undignified way, and ultimately most of them ended up as cannon fodder for crossovers.
From the aftermath of The Crossing, teen Tony Stark. Many Iron Man fans were already unsatisfied with adult Tony's Face–Heel Turn as it was, and were even less happy about him supposedly being Evil All Along (to the point that Avengers Forever would Retcon that last bit for the most part), so bringing in an "uncorrputed" younger self from an Alternate Timeline really did not help matters at all. If there are any positives to the cash-grab that was Heroes Reborn, it was that it ultimately allowed Franklin Richards to reset Tony back to his adult, non-evil self. Compounding the Scrappydom for Teen Tony was his "hologram armor", which was basically an in-universe way to justify its inconsistent appearance between issues.
From Marvel NOW! (2016), Riri Williams, the new Iron Man. The majority of fans hate her because she's barely had any appearances, yet is the new Iron Man over other well-established characters. Others hate her because the name is Iron Man, so it's clear she's a publicity stunt. And others hate her because she's said to be better than Tony, which a lot of people think is contrived. And yet more others think there's something inherently fishy about entrusting the story of a Gen Z black girl to a middle-aged white male author in 2016. Took a while for her to be Rescued from the Scrappy Heap.
This was mostly averted with his other 2016 successor as Iron Man, Victor von Doom. Yes, that one. Probably in part because Doom wasn't accepted in-universe like Riri, maintained his own history, it feeling like a natural progression of his character at that point (he'd been an uneasy ally of Tony's and was The Atoner after having his face healed by Reed Richards) and did more unique things with the Iron Man role — such as using his connections to Marvel's villains to better hunt them — he was more accepted into the role despite Tony Stark himself not wanting Doom to fill it. Many were actually sad to see little done with the role and Doom's status quo reset after all was said and done.
When Marvel Comics bought out Malibu, they cancelled several titles and rebooted many others. Mantra was originally a title about a male warrior reincarnated in the body of female mystic and his struggle to cope with his new role. When Marvel took over, the central character was Put on a Bus by being banished to another dimension and the Mantra mantle was passed to minor background character; a teenaged girl who had appeared as a babysitter in a couple of issues. Needless to say, fans were not impressed. In fact, this seems to be the consensus reaction to everything Marvel did to the imprint.
Nova has Sam Alexander. Basically, Richard Rider had been the signature Nova Corpsman for nearly forty years, and he'd recently had an excellent run that concluded with a Heroic Sacrifice in The Thanos Imperative. The people who didn't want him back right away considered it a great conclusion to the franchise... so, of course, three years later, Jeph Loeb (one of Marvel's most widely-loathed writers) debuted a new Nova character. Sam Alexander won a lot of haters right away for his "arrogant hotheaded youth" personality, a far cry from the mature, experienced, and responsible Rider, and for his powers being completely inexplicable (the Nova Force died with Rider). He also got an immediate starring role in Ultimate Spider-Man (2012), which is a Replacement Scrappyseries and only dug him deeper. Gerry Dugan rehabilitated Alexander to some degree, but than when Original Sin revealed what really happened to Rider, old wounds were reopened. Now people don't hate Sam, but most still direly want Rider back anyways. Exasperating the issue is that Sam is named after Loeb's late son, meaning he probably won't be going away.
There are a lot of fans who hate any character in Runaways who took the spotlight after Gert died. No one gets this more than Klara Prast, for being the only character not created by Brian K. Vaughan, for not having a supervillain parent like every other member of the team, for being introduced in a story generally regarded as a Bizarro Episode, for freaking out over the team lesbians, for not having an origin for her powers, for having a punny name. Lampshaded, when Molly remarks that the team eventually gets used to the new recruits by the time someone else dies.
And then there was the new team introduced in Secret Wars (2015), which was almost entirely unconnected to the old team and made up of alternate-reality versions of established characters like Amadeus Cho and Jubilee. Originally advertised as an ongoing series but turned out to be just a four issue mini. It's unclear if this was by designnote Most SW tie-ins were advertised as ongoings even in cases where it was fairly clear from the beginning that they won't be, like Years of Future Past. or because it became one of the lowest-selling SW tie-ins.
Poor Ben Reilly who was disliked because of the revelation that he was the "real Peter Parker" and that the Peter fans had been reading for twenty years was really a clone. After the huge fan outrage Marvel quickly backtracked and reversed that decision. But what plenty of readers actually did like, however, was how Ben acted as sort of a brother figure to Peter, and felt that his slightly more rough-edged personality made for great character interaction between the two, and Ben has since remained somewhat of a fan favorite for those reasons.
Strangely enough, Ben became this for the Scarlet Spider identity itself. While he is the original, he pulled a Heroic Sacrifice. Years later, Kaine would take the Scarlet Spider name and function as an Anti-Hero Substitute for Spider-Man which resulted in him becoming an Ensemble Dark Horse. Ben would return as the Jackal years later as an Anti-Villain before running off to parts unknown and reclaiming the Scarlet Spider identity. However, his downright unlikability and villainous behaviour in his Scarlet Spider series, the development he'd undergone that changed him from a rougher but more back-to-basics version of Peter Parker to a cynical asshole who aped Deadpool's style of writing made him one for Kaine, who still interacted with Ben while using the Scarlet Spider name and costume but existed to be beaten up repeatedly. So people now wanted Kaine back as the Scarlet Spider proper and for Ben to go away.
Kaine, another Spider-Man clone, was a less explicit form of this trope. He wasn't really a replacement villain for an old one, but his Bridge Drop of Doc Ock solidified him in fans minds as an unwanted loser who was biting off more than he deserved to chew in casually offing a beloved, classic Spidey villain with decades of continuity to back him up, and prompted cries for Doc Ock's resurrection and Kaine's axing. Basically, Kaine managed to become a Replacement Scrappy for a character whose role he wasn't even taking over. Thankfully, Dr. Octopus was later resurrected, and Kaine performed a Heel–Face Turn, saving him from the scrappy heap by becoming the second Scarlet Spider, which turned him into an Ensemble Dark Horse.
After the One More Day storyline broke up the Parkers' marriage via a Cosmic Retcon that took the form of a Deal with the Devil, anyone Peter dated would have gotten heat for not being Mary Jane. But the replacement we got was Carlie Cooper, a Relationship Sue named after editor Joe Quesada's daughter. The very same Joe Quesada who had basically just enforced the break up by editorial fiat, by claiming that Peter had to be made a single again arguing that being married made Spider-Man appear "old" and that it expand opportunities for future stories. Mary Jane became a Shipper on Deck for the pairing, and so did everyone else. Reactions were negative, to say the least, as many readers already saw the whole Cosmic Retcon as Quesada getting of a overall very well-liked Official Couple, simply because he personally disliked it, and to immediately follow up with Peter hitching up with, again, a brand new character named after his daughter, was just adding a generous sprinkling of salt to the wounds and raised several questions about his motives for being so set on breaking up the couple to begin with. Also, as pointed out in the Spider-Man Wild Mass Guessing page, all of her Informed Attributescome from other love interests like Mary Jane, Black Cat, and Deb Whitman. Now people are hoping she'll "be like Gwen Stacy" and die. Following the events of Spider-Island, Peter and Carlie broke up. Fans would get their wish at the end of Superior Spider Man, where Carlie was finally Put on a Bus for good.
Carlie's successor as love interest is new character Cindy Moon, alias the heroine Silk and also a Replacement Scrappy. She is commonly criticized as having many Mary Sue traits, such as having Peter's exact power set, but superior in every aspect but physical strength, and being the star pupil of Ezekiel Sims who was never mentioned in any of his previous appearances. Adding to this, there are many fans who dislike the idea of Peter dating a fellow superhuman at all.
Any Hobgoblin that isn't the original, Roderick Kingsley. Kingsley is a fan favorite for his brilliance, likability, and high success rate. The others? Not so much:
Jason Macendale was an unlikable, one-note Blood Knight and former C-Lister who was almost offensively incompetent. The original Hobgoblin was a powerful mastermind feared by all; Macendale was so pathetic that even the writers came to hate him. He was killed off and occasionally gets mentioned again, but never with kindness.
Phil Urich was seen as only slightly less of a loser. He had a better success rate, but his motive (trying to impress a girl who was blatantly uninterested) was a complete joke and he only got the identity by cheapshotting the original and stealing the gear. It was revealed that the original Hobgoblin was alive and well, and a major storyline had him confront and utterly trounce the pretender.
Doctor Octopus has become a major one among fans after a recent arc concluded with him taking over Peter's body and becoming the new Spider-man, while Peter dies in his, leading up to the new series Superior Spider-Man. This cooled off considerably once it was revealed that both their minds were in Peter's body... only to flare up again when Otto erased Peter from his mind and took full control.
Toward the end of the series Word of God from Dan Slott revealed that this was wholly intentional; the point of the storyline was to demonstrate how fans take Peter for granted by replacing him with the worst possible substitute. It is Peter, not Otto, who is the "Superior Spider-Man" of the title, as admitted by Otto before he voluntarily erases himself and gives Peter full control once more. The storyline still has some detractors, though, mostly due to Arc Fatigue, with some fans feeling everything the series accomplished could've been done in a single arc.
During Kevin Smith's run on Daredevil, Quentin Beck, the original Mysterio, committed suicide. Some years later, when Smith got the opportunity to write a Spider-Man story, he gave the Mysterio costume to an original creation, Francis Klum, who Smith tried to play up as a misunderstood victim who was pushed into villainy after Spider-Man beats him so badly that he's left permanently disfigured. He was so poorly received that Marvel ended up bringing Quentin Beck back from the dead and having Klum implicitly killed off.
Everyone who became Venom who isn't Eddie Brock or Flash Thompson.
When Eddie sold the symbiote in an auction after he found out it was changing him for the worse, Angelo Fortunato won the symbiote and did pretty much nothing apart from wreaking senseless havoc for four issues and then die. Even the fans who do know about Angelo see him as no one who matters, and a total waste overall. He had taken the symbiote solely out of a cocky desire to win him some girlsand his dad's approval, and to be seen as one of the hot baddies of Marvel alongside Magneto and Doctor Doom. Even the Venom symbiote itself drops out and leaves Angelo to fall to his death, simply because he was that pathetic and nowhere near as sufficient as Eddie Brock was.
This would continue once Mac Gargan (formerly the Scorpion) took over the identity of Venom. Not only was he the antithesis of everything Brock stood for — he didn't bother protecting innocents, gave in to the symbiote's violent urges rather than controlling them and was completely selfish — but him getting the symbiote was just a blatant poor attempt to end the massive Villain Decay Gargan had gone through as Scorpion. However in the words of one reviewer; "a loser in a Venom suit is still a fucking loser". He was just a one-note bad guy who ate people a lot and wasn't even threatening because he seemed to exist to get hit with The Worf Effect and didn't even know Peter Parker was Spider-Man, meaning he wasn't even an effective villain to Spider-Man like Eddie was. Nobody liked it and he ended up losing the symbiote after Dark Reign and Siege.
Thankfully averted with his successor Flash Thompson as Agent Venom. Flash was straight-up heroic and returned to the idea of Venom's host fighting its bloodthirsty urges, while also being a darker take on Spider-Man with some complex and nuanced characterisation. Many consider him to be a great character in his own right and he's become a big fan-favorite and the only Venom after Eddie to be liked. However...
After losing the symbiote off-panel, Flash lost the Venom identity to Lee Price, who is by far one of the two most hated Venom hosts by far (the other being Angelo). This is because Lee was unsympathetic despite the efforts of Mike Costa — he casually abused the symbiote and, much like Gargan, is entirely selfish and is more focused on murdering innocents rather than protecting them. However, unlike Gargan, Lee was only a recently-introduced character much like Angelo Fortunato, and is just some shallow misanthrope with no other personality traits as opposed to Gargan's more lovably-scummy, dark Deadpan Snarker personality. This is very fortunately ended once Eddie Brock finally got back the Venom symbiote, and remains with it now, much to the excitement for Eddie-Venom fans, but to the chagrin of Flash-Venom fans (until he got a copy of the Anti-Venom symbiote).
But just when it seems like Lee would be written out entirely, he managed to pull off one last stunt before being steamrolled into Comic Book Death land: end up being a replacement scrappy for two characters. For the story arc Venom Inc., Lee took the Mania symbiote as his own note Cullen Bunn, Mania's creator, was not even informed of this decision - revolting him greatly and derailing his plans for his character (which, given how fond he was of Mania, he always had a lot of), thus phasing out a beloved Ensemble Dark Horse to shill out a despised character yet again, further alienating Agent Venom fans from the character. Thankfully, on 2019's Free Comic Book Day, Lee was unceremoniously stripped of the Mania symbiote and then finally killed by Carnage. To say the least, all Venom fans not only revelled in Lee's death, but some had grown to appreciate Carnage, Base-Breaking Character as he is, significantly more than previously.
The new Ultimate Spider-Man, Miles Morales, was initially treated like this in-universe. A number of characters such as Nick Fury and Spider Woman felt it was disrespectful of Miles to don the Spider-Man mantle after the death of Peter Parker, but he managed to win both of them over after displaying his heroism during a battle with Electro. However he still routinely deals with cops and civilians who view his actions as disrespectful to Peter's memory.
Not like it didn't happen out of universe as well, however he's more of Base-Breaking Character then purely hated. Some feel he's a very good character and the only good thing the Ultimate Universe has left and other think he's Peter Parker light with nothing really interesting about him. While the character has garnered fans since his introduction, the move is still debated - even after Ultimate Peter Parker's resurrection. And then the race thing comes up.
Tanarus, the guy who's replaced Thor after Fear Itself has got hate immediately, because he looks like a '90s Anti-Hero, his appearance and Thor's death mean that there won't be interaction between Thor and Kid!Loki for awhile, he's not using Mjölnir at all, but a weird staff with a heavy head (indicating to fans that he's not worthy to be Thor anyways, since a worthy person can lift the hammer), and for not being one of the many established people who could take over for Thor, namely Beta-Ray Bill and Thunderstrike. Oh, and the fact that when the announcement was made Thor wasn't even dead yet. Thankfully, this turned out to be wholly intentional on the writer's part, as Tanarus was revealed to be someone's impersonation of Thor who had usurped everyone but Loki's memories of him, and ended up integral to Thor's return. Notably, he really didn't star in most of the comics, Loki taking over that title too until Thor was back.
The first and last seem to be annoying people the most, since the first is clearly so Kid!Loki will have a harder time of it without Thor to protect him and the latter is seen as being too much like the DC reboot's treatment of well-liked characters.
In-universe, Loki loathes Taranus for this very reason. It's even worse for Loki because he's the one responsible for this situation.
The female Thor got this treatment from the very moment she was announced and it's only been getting worse with time:
Initially it wasn't anything against her character (her identity is a mystery at first and nothing about her was revealed), but due to the fact that she's using the Thor name. Unlike Captain America and Batman, that is Thor's legitimately real name. It's like if Dick Grayson just started calling himself Bruce Wayne out of nowhere. Marvel even said that she's not She-Thor or Thorgirl, but Thor. This also lead to confusion regarding solicitations and the like, which still refer to the real Thor as Thor, but also refer to female Thor as Thor.
Then there was the way the original Thor lost his hammer. Jason Aaron apparently thought that having Nick Fury whisper something mean into Thor's ear would be enough to have Thor lose his hammer. Having a beloved character be shoved out of his role through such an Ass Pull method angered some readers.
When her book actually started, things got even worse, as some saw it as having veryunsubtle and heavy-handed feminist messages and insulting subtext directed at anyone who disliked the change.
A stranger case involves the identity of the new Thor, Jane Foster. The series blatantly teased that she was actually Roz Solomon, and many people would have preferred they went that route, as many felt the revelation that she was Jane Foster was a twist for the sake of a twist and for diversity reasons. This subsided with the first issue of The Mighty Thor, which actually went in-depth in its portrayal of Jane Foster as a cancer patient.
Jane Foster once again came back with vengeance this time now replacing Brunnhilde as the new Valkyrie moving foward and also becoming the new All-Mother of Asgard replacing Freyja after she abdicate the throne. When Marvel announced a new solo series but with Brunnhilde not starring in it after Jason Aaron decided to unceremoniously killed her off not just Brunnhilde but the entire Valkirye race in War of the Realms for the sake giving Jane another book.
The entire Inhumans race and franchise was this to mutants and the X-Men for much of the 2010s, due to Marvel trying to replace the X-Men due to not owning their film rights. Originally a small, xenophobic race of genetically modified humans who gained superpowers through exposure to terrigen crystals, it was revealed that millions of people around the world have latent Inhuman DNA and are now gaining superpowers as a result of mass exposure to said terrigen. Terrigen also, incidentally, sterilizes mutants and created an "M-Pox" plague. The combination of the Inhumans occupying the X-Men's place as Marvel's superpowered minority allegory, their push into the mainstream while the X-Men were downplayed, and the M-Pox subplot resulted in vocal dislike of the Inhumans, who gained a small number of fans but much, much more detractors. After Disney/Marvel reacquired the film rights to the X-Men, the X-Men were given a massive push while the Inhumans were Put on a Bus and relegated to occasional supporting roles at best.
With the real Wolverine dead, Marvel seems to really want to make Sabretooth into the new Wolverine. While X-23 is the one actually using the codename, Sabretooth is the one who is actually filling the role Wolverine usually does; the token killer on a team who threatens violence on his enemies, but at the same time tries his hardest to ensure that no one else follows his path — including the bad guys — and is also The Atoner. However, fan reaction has been polarised, at best. Many detractors point out that the guy is a bloodthirsty murderer and his high body count. Others point out that, unlike Logan and X-23, Victor didn't want to be redeemed — his morality was flipped literally by magic. And the fact that this change in direction to his character could only be achieved through such a contrived reason (even for comic book standards) means it's hard to take him seriously as a character.
Another part of this also stems from the fact that there already are heroic Sabretooths; they just tend to be alternate universe versions who don't have nearly as much blood on their hands. These versions are liked, and the mainstream Sabretooth is seen as a poor imitation of them.
Avril Kincaid, the latest person to take up the name Quasar, quickly became this. A lot of the hate came from the fact that not only did she displace the more popular original male Quasar, Wendell Vaughn, but also the alien female Phyla-Vell, the daughter of Captain Marvel. Coming off at a time where many of Marvel's mightiest were being replaced with many a Legacy Character, she just felt like a random cash-in. Things got worse with the lead-up to and release of Secret Empire, where Avril was being boasted as the only person who could smash a powerful barrier designed to keep alien threats out of Earth and being put in a Convenient Coma to raise tension because of it.
Nadia Pym (later Van Dyne) got hit with this hard when Marvel announced she would be getting her own solo series just months after her very first comic appearance, when Janet Van Dyne, the originalWasp, still hadn't gotten one after having been a reasonably steady Avengers character for over fifty years. While some fans have been won over by the solid mentor/mentee Happily Adopted relationship the two Wasps have, some still decidedly consider Nadia to be a thief.
Unfortunate Implications, while Nick Spencer was known to take swipes at any detractors of his run, very unsubtly include political commentary and turning Steve Rogers into a Nazi with a Cosmic Retcon. Many are sad that Falcap never got a fairer shake.