ARIA has Aria Pokoteng, the "Mars cat" that functions as the president of Aria Company. He's not particularly smart or funny, and can only speak using annoying baby talk. This gets even more obvious in the anime adaptation, where his constant loud interruptions often get in the way of the interactions between the other characters. Still, he gets shoved in almost every scene, and the characters in the story can't help but proclaim how cute and interesting he is.
Beyblade: Daichi in the the third and final season. Basically a exaggerated Copy Cat Sue of Tyson with a very irritating voice who gets just as much spotlight, leaving Max, Rey and Kai with less screentime.
Bleach: In the Invading Army arc, the writers replaced both Rukia and Orihime with their own creation Nozomi (Rukia's personality, Orihime's healing powers) so the canon girls ended up going entire episodes with no lines. The writers also rewrote Kon's canon modsoul background to explain Nozomi's existence as modsoul, to give her a zanpakutou despite her not being a shinigami, and to justify her being Kon's Love Interest. The writers also rewrote Yumichika's unique special power to allow her to develop even faster than Ichigo's own unique development speed. She went from powerless to able to one-shot two bankai-wielding captains, absorb the power of multiple lieutenants at the same time, instantly analyze and defeat Kyouraku's shadow-technique that had confused even the Primera Espada, and save Yamamoto's life from an opponent that was too strong for Yamamoto but which Nozomi was powerful enough to fend offnote For comparison, Ichigo's training comprised of 3 days to gain his zanpakutou, 10 days to train with it, 2.5 days to gain bankai, a month's hollowfication training and then 3 months to take on Aizen. Nozomi went from powerless to protecting Yamamoto in a day-and-a-half. Lastly, the writers broke their own rules for modsoul death (instantaneous reversion to pill-state) so that characters could weep over her Heroic Sacrifice as she slowly faded away.
Bubblegum Crisis had Priss Asagiri, who bordered on being a Canon Sue for her ability to stir up trouble and get away with it - though she actually was well liked by fans (having a popular singer as her original voice actress helped).
The first season initially led some fans to resent Suzaku for his Moral Myopia and nonsensical idealism that constantly got in Lelouch's way, with several believing the creators were somehow trying to favor him. However, this too was subverted in time: Suzaku was Rescued from the Scrappy Heap after a lot of suffering and he eventually came to abandon the more annoying parts of his idealism, which made him tolerable or even likable in the eyes of many detractors.
D.Gray-Man has developed their own Creator's Pet in the form of Johnny. Initially a very minor and forgettable character that would appear among the other members of the Science Department. But clearly through the power of the mangaka's love, Johnny's role in the manga increased tenfold after the arc with Noah's Ark, appearing more in the manga than the second main protagonists Lavi and Lenalee. And while he is supposed to be a normal human, he seems to live through several near death experiences and injuries that are fatal to more minor characters, much to the chagrin to the fanbase. When he isn't nearly dying, he is crying or thinking about Allen Walker (the main protagonist) in a very obsessive way. We're also supposed to assume that Allen and Johnny are close friends, though this friendship was never seen developed on screen even though 80-90% of the manga focuses on Allen's life and experiences in the Order. To find a fan who loves Johnny is extremely rare in the fanbase, most seem to simply wish for him to go away and for Hoshino to remember she has other characters.
Dragon Ball Z gives us Broly. Not so much for his anime appearances (Though he does show in 3 movies, getting more ridiculous on each of them), where he's more of a Base Breaker. However, he certainly qualifies for his video game roles, where he keeps on getting more and more absurd stuff to do (Bonus Boss on a game that covers waaay before he even makes sense to show up in? Sure! Super Saiyan 3 transformation? Why not! And have him in every game!). Note Americans love him, so he doesn't count on there, but on other places, especially Japan (where mocking him is a meme), he's this.
Agon of Eyeshield 21 became this to many fans during the World Cup. To elaborate, Agon's original purpose was to be the heel of the series. While every other antagonist was a lovably quirky Worthy Opponent, Agon was a completely unsympathetic Jerk Jock. Unfortunately, it seemed that Inagaki and Murata found his character to be Affably Evil and was thus promoted to Token Evil Teammate, and the was Character Focus of the arc (sharing the position with Gao). Regardless of whether you hated him, loved him, or loved to hate him, pretty much all fans agree that Agon shouldn't have gotten as much attention as he did (even more then the main character).
Jellal from Fairy Tail. It's obvious that the author Mashima likes him, as he's the only character except for Natsu, Lucy and Happy to consistently appear and play a role in every arc of the series. For more details on why he is so hated, check The Scrappy or Broken Base.
F-Zero: GP Legend: Ryu Suzaku/Rick Wheeler was considered this by a good deal of the Western half of the fanbase. The show practically pushed the characters from the game into the sidelines to show how cool Rick was, among other things. While the show never got past episode 15 being dubbed in North America, the ending of the series -in which he assumes the mantle of Captain Falcon after the one in the show makes a heroic sacrifice- didn't endear him to fans at all. Nintendo has since scrubbed his existence from record and only acknowledges the F-Zero series up until GX.
InuYasha: The Anime rewrote canon to make Princess Sara the one person who managed to love Sesshoumaru (canon: three people did: Rin, Jaken, Kagura). A pure-hearted girl willingly turns into a demon via Naraku's method (canon: only an evil heart can do this). The demon made stealing Tessaiga look easy (canon: if it was that easy, Sesshoumaru would already have it). Toujikin can't hurt the demon because it's a hate-filled sword (canon: Toukijin's hate is what makes it a powerful youkai-killer). Kagome's sacred arrows make the demon stronger instead of injuring it (canon: impossible, sacred arrows = purification = youkai death). Only Tessaiga could hurt it. Sesshoumaru never met the girl before she became a demon (she was a Stalker with a Crush he once distantly heard the flute of), and spent most of the time dealing with the demon's personal vendetta against him (reason never given). The girl randomly starts fighting the demon control, asking Sesshoumaru to save her which Sesshoumaru (randomly compassionate) does by defying Tessaiga's barrier (canon: he can't do this) to injure the demon and free her soul. In short, creator heaven, canon hell.
Keroro Gunso: Joriri, an anime exclusive character. An annoying, one note joke, poor role model who apparently taught many lessons to the young Keroro and friends. Did we mention he wasn't mentioned until 150 + episodes in? Fans tolerated his presence in the fan favorite flashback episodes...until he appeared in the present, bumming it in the base. That officially graduated him into Creator's Pet territory.
Magical Record Lyrical Nanoha Force is a rather bad case of both the protagonist and the villains being this: on one hand, Tohma is a newcomer to the world of Nanoha, but the Remember the New Guy way with which he is introduced, and the fact that he's instantly liked by pretty much every member of Nanoha's team, certainly reek of author bias.
Much less ambiguous is the case of the Huckebein, the villains of the piece: they are a bunch of Villain Sues with New Powers as the Plot Demands who have been wiping the floor with Nanoha and her friends ever since their introduction, and show no sign of stopping anytime soon. Only the introduction of the AEC Weapons gave the good guys a slight edge, and even so, the Huckebein are still at an overwhelming advantage. They are also very unsympathetic, slaughtering entire villages and communities while claiming they only do it to survive - but the delight they take in killing simply doesn't mesh with the Woobie, Destroyer of Worlds image they're supposed to project. Despite this, the author spends more time focusing on the Huckebein and their escapades than writing about Nanoha and Tohma, and he seems to be genuinely shocked that the readers don't like them.
The manga adaptation of Mobile Fighter G Gundam did this towards Allenby Beardsley, the pilot of the Nobel Gundam. The manga's artist/writer ended up showing her in a much more favorable light, striking many more Sailor Moon-related poses and even getting a brand new Mobile Fighter (in the anime, she just got a second, normal Nobel Gundam, in the manga, she gets the Super Nobel Gundam, which runs the Sailor Moon motif into the ground) while turning the much more calm and motherly Rain Mikamura into a Tsundere. This is really evident as there's not much weight into Domon and Rain's relationship and the ending where the two defeat the Devil Gundam feels incredibly tacked on, unlike the anime, where it was awesome.
Itachi Uchiha from Naruto hit this trope running and never looked back. He was already skirting it just by being an Uchiha, the clan having dominated the plot for a very long time. The manga's author is on record saying Itachi is his favorite Akatsuki; unlike other 'powerful' characters, especially Akatsuki, Itachi has never been humiliated in a fight or ultimately revealed to be incapable of dealing with another character just to hype the latter. Other characters have praised him on more than one occasion, calling him a genius and a hero, and recently he was literally resurrected just so he could have the spotlight one last time. He has all the qualifications, and is considered two thirds of the fandom to be a Scrappy with a very, very Vocal Minority which loves the Character Shilling he gets. There are three main camps in the fandom. People who think he's awesome, people who hate him, and people who originally didn't really have strong opinions either way until he started getting a ton of unnecessary Character Shilling, at which point they got sick of him.
When Hashirama Senju says you’re a greater shinobi than him, you just might be a creator’s pet.
Or when the "God of Shinobi" praises how incredibly wise you were at seven.
And Sasuke basically goes from wanting to destroy Konoha and everyone in it to wanting to protect Konoha and everyone in it because Itachi's sacrifice would be meaningless. Yes, that's right, Itachi pretty much made everything Naruto spent the entirety of Part II working towards, sacrificing himself, disobeying orders, taking beatings, and begging people Sasuke wronged to forgive him completely and utterly meaningless.
Hell, even Sasuke himself could count. Having fangirls in-universe from the outset of the series, being treated and looked at considerably more highly than the main character despite being an aloof jerkass (although he did get better for a time), his defection causing so much emotional turmoil that neither Naruto nor Sakura could ever truly accept that he'd become an enemy even when he was out to destroy Konoha, and of course the way his interactions with Itachi both started, turned Up to Eleven, and then finally ended his quest for revenge means his entire descent into darkness is likely set to be handwaved out of mind aside from lingering trust issues on the part of comparatively minor characters. Not to mention being one of the characters in the series who often shoot new powers out of their ass whenever the plot deems necessary.
Basically, the fanbase is being asked to wade through a lot of crap for the sake of the Uchiha brothers. It's no wonder they're two of the biggest Base Breakers in the franchise.
Hinata is adored by the Animators and thus winds up getting more moves and abilities in the filler sagas and anime that she didn't have before and doesn't wind up using again. Heck in the Anime of the Pein Arc, in her "fight" she actually manages to land hits on Pein something no one else was able too and momentary disable the spikes embedded into Naruto almost freeing him. Compare to the Manga where she got blown out of the way effortlessly by him. Contrast that to Sakura who the Animators seem to have a Vendetta against.
Pokémon often has a problem in balancing the screen time of the titular creatures. Ash used to be criticized for his overuse of Pikachu back in the day but Piplup is the most blatant Creator's Pet, being constantly forced as the secondary mascot of the series while Dawn's other Pokemon rarely get a chance to shine. Still, for what it's worth, Piplup's over-exposure on the show has also cemented him as the very definition of the Butt Monkey when it comes to the Pokemon themselves.
May's Squirtle in the Battle Frontier arc had elements of this as well. Despite being an untrained baby, it knew moves that it shouldn't, won battles that it shouldn't, and stole screentime away from all of her other Pokemon. And among long-time viewers, it certainly didn't help that Ash used to have a Squirtle of his own, except his wasn't a Marty Stu and had a much more interesting personality.
Even if he's been eclipsed by Piplup and Squirtle, the original God Mode Chu still had a bit of this. Being the most overexposed character in the history of the world and not following the rules of the video games rubs many people the wrong way.
Paul was also what brought on another Creator's Pet; the Chimchar he previously owned. Due to Ash and Paul being rivals, Chimchar was what really connected the two; Paul being who released Chimchar and Ash taking him in. It was sure to be a major storyline seen throughout Sinnoh, and Chimchar was indeed well-liked at first as people enjoyed watching him grow as a strong member of Ash's team against what Paul wanted him to be originally; even evolving to his final stage, Infernape. The problem is, his screentime was too much and he became an eyesore to watch as he went on to continously beat 2 Pokemon each of the remaining 4 Gym Leaders and defeating 3 of Paul's 6 Pokemon in their league match.
The second half of Sinnoh, Chimchar/Infernape might as well have been Ash's only Sinnoh Pokemon. People were sick of Chimchar/Infernape because he took the spotlight away from the rest of Ash's Sinnoh team and others of Ash's Sinnoh Pokemon had to continuously struggle just so Chimchar/Infernape would come in and wreak the place. Turtwig, after having a good showing in his baseform, perhaps got the worst of it after evolving. Only ever beating Candice's Sneasel as a Grotle and getting endlessly Curbstomped as a Torterra outside of Team Rocket skirmishes.
As of the X & Y series, many older fans are beginning to view Ash, Pikachu and Team Rocket as this, due to their overexposure and the fact that the anime has become too predictable.
Sailor Moon SuperS and its insane focus on Chibi-Usa. The fact she's a creator's pet is made more apparent from an interview done with the show runners from that season. Their favorite character? Chibi-Usa. In fairness, Chibi-Usa did get more focus during the manga version of the story arc, but she wasn't bumped into main character status like the anime. Every episode features her in some way. Even the Day in the Limelight episodes for the other characters has at least one scene where Chibi-Usa talks about what she's learned from that episode's plot. Even The Movie had more focus on her. There's a reason the fanbase has come to call her the Pink Nightmare.
The Slayers has Pokota, a Bratty Half-Pint trapped in a Ridiculously Cute Critter form and who has an angsty backstory. His personality was said to be based on a character who appeared later on in the Light Novels. This might not have been so bad (though he IS still annoying), but Pokota just so happens to be a Black Mage on par with Lina Inverse and a Magic Knight wielding a replica of the Sword of Light. These two things, plus his bratty behavior and the fact that the plot of Slayers Revolution all but revolves around him definitely makes him a contender for being a Creator's Pet. The worst thing is that while many "guest stars" in the Slayers anime do share similar traits (Filia could be annoying and Xellos has power levels equal to that of a GodModeSue), Pokota largely isn't *funny* in a comedy show and yet gets a lot of screen time, a strong sign of a Creator's Pet.
Lina herself, at least to the Light Novel illustrator. Because of the prominence of the prequel novels, Lina gets a ton more artwork than her allies do (there are virtually no new art pieces featuring Zelgadis and Amelia, other than a throwaway cameo in the fifth Slayers Smash novel), and recently, the artist has upped Lina's fanservice status to the point that her nipples are visible in every drawing, regardless of how modest her outfit is.
Sonic X: Chris Thorndyke. From the second episode onward, Sonic was reduced to a minor supporting characterwho hardly speaks, while all the attention was on Chris. Characters will only be praised for saving the day if Chris played a part in it, however little (and he'll always be given even praise by the one who did all the work). The way he obsesses over Sonic makes even Amy's attraction look perfectly normal. He also completely usurped Amy's role of Shadow's conscience in the Sonic Adventure 2 adaption, so that he could hog more of the spotlight at the expense of not allowing Amy to show her Hidden Depths.
Berry Shirayuki (a.k.a. Berry Sue) from the Tokyo Mew Mew A La Mode manga. This was not helped by invoking the very rare instances of replacing a shoujo series' star character without giving the series an explicit Retool. Not helped was that the manga was not written by the original creator and gelled so badly with the original that most people relegate it to Fanon Discontinuity.
Yu-Gi-Oh! 5Ds: Crow, commonly hated for being a Canon Sue due to his Common Marty Stu Traits—childhood friend of The Hero and The Rival, Game Breaker deck, a flying D-Wheel, and is adored by the children of the city. His importance to the series and the hatred he got from the fans would only increase as he became the Fifth Signer and got a Blackwing-themed Dragon to go with the position, both events retconning the backstory that is the basis of the entire series. As of the second season Crow was the third-billed hero of the show second only to Yusei and Jack, but his character was nowhere near as explored or developed.
To twist the knife more, he's also a Replacement Scrappy to the former third-billed hero Aki, a Dark MagicalAction Girl with a much deeper character arc and more interesting backstory. Aki was Demoted to Extra once Crow arrived and her character arc became weaker and lost focus as a result. The end credits are almost mocking of this—in a montage of the heroes Yusei, Jack and Crow are listed as their positions on Team 5Ds (Third Wheeler, First Wheeler, Second Wheeler) while Aki is listed as "Benchwarmer". Furthermore, several of the episodes where Aki got to shine again still somehow involved Crow in their plots.
The production crew members' Twitters have shed a bit more light on this: turns out Crow wasn't a Creator's Pet at all! Rather, his deck was a marketing executive's pet. After his first appearance, nobody predicted that the Blackwing cards would sell as well as they did, and when the numbers came in, the card company execs ordered the anime crew to make him a main character. This ended up torpedoing a lot of things the creators intended to do, including a rematch between Rua and Bommer that would've presumably resulted in Rua getting his dragon a season earlier than he actually did as well as a full backstory for Demak, who ended up a Generic Doomsday Villain in the final product. No matter what side of the Crow debate you're on, it wasn't the creators' fault at all; they were probably as annoyed as his haters.
Yu-Gi-Oh! GX: Johan/Jesse Anderson was the first undisputed Creator's Pet (not to mention Marty Stu) of the franchise, stealing the spotlight from Judai's friends and becoming the secondary protagonist during the third season. It was hinted that Johan may have known Judai before, and he was The Chosen One of something, however neither point was elaborated on. Thus in essence, Johan became Jaden's best friend in only a few episodes, but there was no real reason given why he was so important. A major part of the season revolved around the protagonists getting sent to an alternate dimension and trying to find a way home. And they did...by having Johan get his ultimate monster Rainbow Dragon. Oh yes, and when he and Jaden dueled the Big Bad, Johan performed a Heroic Sacrifice to send him home. From there on the series focused on Jaden and his friends getting back to the alternate dimension to save Johan who had been left behind. He would return in the 4th season, where once again teamed up with Jaden to duel the main villain again.
It should be noted that if any other character had dared showing up so suddenly just to be perfect he or she would have been hated instantly. Johan on the other hand is very popular.