Battle for Dream Island has Loser in its fourth season. Despite being loathed by the fans for ruining some of the most promising characters for this season, he is nothing short of worshipped by the other objects, and is both Cary and Michael's favorite character.
Cartoon Fight Club by Animation rewind has TeenGohanFighter, also known as Gohan6425, and more recently, TheSSUltimateGoku. One of the most hated members of the vs community, he is known to be extremely rude, insulting other people at every turn. He also treats his opinions as facts and insults anyone who disagrees with him. He is also hated for his poor grammar, constant mispronunciations of characters' names, and poor mathematics skills. He is by far the most hated member of Animation Rewind, yet the head of Animation Rewind treats him like a king who can do no wrong. He has been allowed to co-host two fights with the head, and the head even allowed him to be the chief admin of Animationrewinds Deviantart group. In both of the fights co hosted by TeenGohanFighter, the head kept talking about how TeenGohanFighter is the single most unbiased person on all of YouTube. Many people have asked the head to fire TeenGohanFighter, but the head keeps him employed, despite him being hated by both the show's fandom and other members of the show. Hated by fans? Check. Given unwarranted praise and attention? Check. Talked up by others? Check. Liked by the writer? Check. It's so bad, the head brought him back to co-host a third fight instead of firing him, despite a whopping 22% of the votes in this poll asking which researcher people think should be kicked off the group being for him, far higher than anyone else.
The Furtopia Darwin's Soldiers RPs has Dragore, who fits this trope perfectly. He is a major Mary Sue and a scrappy with a big role, adored by the creator and steals the spotlight.
Lupis from the rebooted Furtopia RP is even worse. He literally hijacks the entire story and the plot shifts from a focus on the terrorists to the rogue scientists, who were originally in the background.
Diedrich of Gaia Online gets a lot of hate from users who find his personality quirks obnoxious, and are sick of seeing him shoehorned into one event after the other.
A rather large part of the Happy Tree Friends fanbase view Lumpy as this. While he has his fans, it doesn't help that there were only two TV episodes Lumpy didn't appear in. In some of these he didn't have much of a role other than just to be there. This is only justified by the fact that the writers seem to work on a "take the dumbest character in the series and throw him into jobs that require brains and see what happens" system.
Ronnie the Skeleton on The Irate Gamer. He is a Jewish stereotype who was hated from his first appearance, where he was given an extremely Overly Long Gag regarding talking non-stop on the telephone. It seems none of his fans or non-fans like him, yet Bores is attached to him so much that he'll put him in any possible place, like having this already hated character do things like host a Christmas Special and save his life.
One of the recurring complaints about Marvel Super Heroes: What The—?! concerns the fact the ugly and obnoxious M.O.D.O.K. appears in nearly every episode. Despite this, Marvel still gives him a frequent amount of scenes.
MLB Trade Rumors publishes a number of articles based on players' agents despite the fact that the comments for them are the lowest on the site. Simply put the viewers don't care who represents who (with the exception of super agent Scott Boras, or recently when Jay-Z became an agent).
Porn example: Sara Stone on Naughty America. After being gone a few years, she returned to the biz with a "exclusive" deal with the site. As expected, she had a couple new scenes... then more and more and more... to the extent that if there was a possible sub-site/genre she could be placed in (ex. threesomes, cowgirl as in the occupation, cheating wife, etc.) you could best believe she was there, sometimes two scenes of her per week. This isn't to say that she was actually bad in said scenes, but the viewers called the site on it and eventually the frequency died down along with the exclusive deal.
Certain Neopets rank low in popularity, but seem to be favorites among the creators. The chia (currently ranked 31/54) and blumaroo (36/54) both pop up far too frequently on the site in the form of NPCs, special items, location art, and the like. On the other hand, the chia was the first Neopet created.
The biggest example on the site is probably AAA, the game master. Not only is he an insufferable prick, but his challenges also directly cut into the various plots on the site, forcing them to be rushed. Considering that the plots and their associated puzzles were some of the highest draws on the site, many fans cried foul.
Since his Flanderization kicked in, Mr. Goodman has become one of the most hated characters from SuperMarioLogan, even more so than Jeffy, due to him rarely, if ever, suffering any consequences for his actions, always getting away with essentially extorting Mario. However, Lance, the older brother of Logan Thirtyacre, has stated that Goodman is his favorite character, and Logan has also stated that Goodman is one of his favorite characters as long as he does not have to hold back on inappropriate jokes with him.
Zapdramatic desperately wants the viewer to sympathize with Ted Hartup from Ambition. Keep in mind the guy starts out trying to get his kids back from his ex-wife by going to her office strapped with dynamite to hold the entire floor hostage by threatening to "blow us all to hell" while ranting that he's a victim of some kind of conspiracy, and after he's arrested starts regularly escaping from jail (the first time including assaulting a police officer) and at one point threatens the player with a gun (and even accidentally kills them if they say the wrong thing.) Zapdramatic soon tries to paint him almost like some kind of Hannibal Lecter-style intellectual who's always right and regularly abuses ten-dollar words. Early on, the player has to interrogate him and rule that he's perfectly sane, which in the world of Ambition, means that he's excused of every criminal act he commits because he's an innocent victim being played by sinister outside forces, instead of being criminally responsible for his actions like it works in the real world. It gets even better when Duke Crabtree forces you to go along with a plan to frame either Ted or Yale for a murder. Trying to frame Ted locks the player into a no-win scenario while the game chastises them for trying to frame poor, innocent Ted.
Bonus points for there being strong evidence that Ted is Zapdramatic's Author Avatar.
Sir Basil Pike Elementary has Janina, who seems to be a stand-in for Zapdramatic's daughter, in a series that was apparently made to help her cope with bullying. Only the series does nothing to make Janina at all likeable, with her constantly spying and butting into other people's problems and snarking at them. She's supposed to be a big up-and-coming musician, but her only song can't decide whether it wants to ripoff "Enter Sandman" by Metallica or "Animal I Have Become" by Three Days Grace, isn't very good, and comes with a very confusing music video.
The Ultramarines are "The GREATEST of them ALL!" as the 5th Codex tended to portray them, with outright impossible feats under their belts and a massive chain of victories that never seems to end. They are also hilariously obnoxious, generally acting like ultra-goofy paladins ripped straight out of a high fantasy parody with an impossibly inflated opinion of themselves and their entire chapter. All of this is epitomized in the shrill-voiced Glory Hound that is Cato Sicarius, who won't stop at anything to get himself more glory and inherit the Chapter, and who is obsessed with himself and telling everyone what he'd do in a given situation. Only Uriel Ventris and Marneus Calgar have noticed all of this, and the latter utterly despises it because the combination of obnoxious underlings and zero difficulty in doing anything (he personally punched out a massive Eldar Titan on-screen like a man would swat a fly) is driving him nuts. Particularly because, if the various hints are correct, he's the one to blame for it all.
Kaldor Draigo is just as Sue-ish as the base material, at least in terms of skill. He can trash entire armies of daemons all by himself, and literally punches out a Daemon Primarch gone One-Winged Angel in a millisecond or so. However, this is justified by way of him being entirely convinced he can do all of this and more, and since the Warp runs on belief and has imbued him so thoroughly, he can. And he's so convinced of this all because he has lost his goddamn mind from Warp exposure and isolation. He's less of a brave paladin fighting the perils of the Warp and trouncing them flawlessly every time, and more of a hilariously incoherent Almighty Idiot stuck in Power Armor who thinks he's a brave knight when he isn't just doing weird shit for absolutely no reason.