No matter what continent they might live in, the most dire enemies for many anime and manga fans are very often other anime and manga fans.
Anime as a whole has the Subbing versus Dubbing debate. Anime adaption vs. original Manga is also a common argument.
Inuyasha: The Inuyasha/Kikyo vs. Inuyasha/Kagome; Inuyasha/Kagome vs. Sesshomaru/Kagome, and Sesshomaru/Rin vs. Sesshomaru/Kagome vs. Sesshomaru/Kagura.
There's also the "loyal" fans who followed the entire series and still loved it, while there are those that gave up watching it when they believed the series had jumped the shark mid-way through, and there are those that bothered to go through the entire series, only to come out hating the entire series that it makes you wonder WHY they wasted watching all 193 episodes?
After you get past the Subbing versus Dubbing debate, AKIRA then has the debate as to whether the Streamline dub or the Pioneer dub is superior. It all boils down to whether one prefers Liquid Snake or Vash the Stampede screaming "TETSUO!!!!"
Several dubs of Ghibli movies have had similarly heated debates: fans in general can't seem to unanimously agree about whether the Streamline dub or the Disney dub of Kiki's Delivery Service, Castle in the Sky, My Neighbor Totoro, and Porco Rosso is superior. (All the more dubious because Carl Macek, who helmed the original dubs for Totoro and Kiki, was dissastified with the original dub of Laputa , which was hastily made by an unknown company and picked up by them for distribution.). Likewise with Porco Rosso.) Hey, even some fans think the new version of Nausicaä of the Valley of the Wind is worse than the American edit of "Warriors of the Wind", despite the fact that is an almost word-for-word faithful adaptation of the original film script.
Fans are divided about Fanservice, Moe, and Harem, and similar appealing-but-not-explicit elements. It has been argued that these elements can cheapen the narrative of any show, and attract antisocial fans who only enjoy series because of their Perverse Sexual Lust for fictional characters. Other fans will argue that such elements can not be avoided in order for a series to get a decent budget, and to get attention from fans. A person's opinion may depend on what (if any) types of fanservice, moe, and harem elements they enjoy.
There was an awful lot of disagreement over the Digimon seasons after Digimon Adventure. Did 02 suck because it downplayed the original team in favor of the newbies? Did Tamers suck because it was too serious, or because it took place in an Alternate Universe? Did Frontier suck because it moved away from the very concept of Mons? And let's not even get into Savers.
Saint Seiya and the "eternal" debate about who is the most powerful gold saint (and now, with the inclusion of more of them, in Lost Canvas and Next Dimension, and even Omega, the reign for supremacy has more candidates/challengers) Fun fact: the author already did many years ago a ranking list with the powers for the characters (at least for the original golden saints from the classic era), but since it just doesn´t have logic in some cases, and in others he favour some no so popular saints, most of the fanbase just give a fuck about his list...and their eternal struggle continues...
Sailor Moon has many a debate, even to this day. Is Usagi a Mary Sue or not? Is Chibi Usa an annoying Usagi clone or a deep, important addition? Is Rei a complete witch or is she just assertive? Is Mamoru better than Seiya for Usagi, or vice versa? Then there is the whole lesbian thing ...
It doesn't help that the series contains a manga (and sister manga series, Codename: Sailor V, which precedes it), an anime, three anime movies (with dubious relation to the anime plot), a live action drama, and several musicals - all with semi-unique canons. For example, while Rei is a calm Ojou in the manga, she's a hot-blooded tsundere in the anime. Then there's all the adaptions for other countries, most of which messed with the various canons to fit the morals of the place adapting the manga/anime/etc..
Also, if the English dub was a horrible anathema for its censorship, or was generally justified and good on its own merits.
Some debates have sprung up on whether or not Code Geass and its Oddly Named Sequel underwent Plot Tumor, Sequelitis or whatever else applies. The ones detesting the sequel said that many of the above apply, while the pro R2 fans defended the second season and sometimes resorted to calling the dissenters Unpleasable Fanbase, just as the others yclaimed the supporters clinged to anything related to Code Geass.
Amusingly, aside from Ship-to-Ship Combat, the fanbase more or less raged and celebrated as one (see the hate for Suzaku and Rolo, the cheers for Kallen Combo and Orange-kun as examples) up to about R2 15, when more cracks started to appear in the base. When the bomb dropped in R2 19 (which was ironic given the literal one in the previous episode) the fan base instantly exploded. The pieces from this continued to break apart and become more vicious right up to the end and after.
Actually, Suzaku is something of a Base Breaker. There are viewers who adore Lelouch and hate Suzaku, viewers who admire Suzaku and hate Lelouch, viewers who respect both, and viewers who hate both. The first group is bigger than the second, but the third seems to be the dominant interpretation of the final episode.
Attesting to this base is the fact that the late-R2 entries for the series CMOA and Narm are often one and the same!
The Naruto fanbase is this way over Sasuke Uchiha, A.K.A. the most divisive character in existence.
And the first paragraph above pretty much perfectly describes the fanbase regarding Part II/Shippuden, with the revelation of Itachi being good and the ending of the Pain Invasion arc probably being the most notable divisions, aside from everything Sasuke has already done.
From the beginning, the identity of Tobi has caused feuds among the Naruto fanbase. This was apparently remedied when he revealed himself to be Madara Uchiha. However, two hundred and some chapters later, the real Madara showed up, proving this to be a lie. Once again, the fanbase exploded with theories. The revelation that Tobi is in fact Obito Uchiha has not done anything to fix this rift. In fact, it has probably made Naruto fans even angrier. It's a rare case where a broken base has effectively REUNITED in its outrage at one particular moment.
The biggest case of Broken Base in the history of Naruto started when Team 7 reunited during chapters 631 and 632. Not only did the shipping war explodeagain after Minato made a comment on Sakura being Naruto's girlfriend (Naruto agreed) and compared her to Kushina just after Naruto and Hinata's situation in 615 (and let's not mention Sakura's sudden reveal of her Regeneration Technique), but the fact that Sasuke said he would become Hokage regardless of what others think of himruined the manga for many people.
Fullmetal Alchemist fandom when it comes to the manga and Brotherhood (the second anime that follows its continuity) versus the original 2003 anime. The latter was a Pragmatic Adaptation that Overtook the Manga, and thus there are huge differences in both plot and character development between the two continuities. While most fans like both to at least some extent, nearly all have a preference one way or the other, and the fandom remains fiercely divided over which is better.
This debate even fuels FMA's Ship Wars. Chances are if you like Het, you're going to find more friends in the Mangahood fanbase, as that version has Ed and Winry end as an Official Couple and heavily implies romantic feelings between Roy and Riza, Ling and Lan Fan, and Al and Mei (at least, from her end). If you are more into Slash Fic, you'll probably like the original anime better, as there's far less focus on (and no resolutions to) heterosexual romance and a lot more material for those wearing Shipping Goggles to interpret as Ho Yay. (Especially in The Movie.) Obviously, there are many exceptions, but that's generally how it aligns. As a result, arguments over which is the superior version can frequently turn into shipping debates, and vice versa.
When the 2003 anime was the most well-known version, though, there were plenty of shipping debates within its fanbase, especially involving Ed's romantic life. The biggest one was over if Ed should end up with Winry or Rose, but there were also a lot of people who paired him with Roy Mustang, Alfons Heiderich, his own brother, even Envy... and the fights over them could get pretty heated. At least everyone could agree that Ed didn't belong with Noah, who was originally planned to be his Love Interest in The Movie.
Brotherhood itself was a bit of a Base Breaker, as even some manga-preferrers thought it was a lackluster adaptation, while others found it to be a great adaptation.
Misty's departure in Pokémon pretty much split the fandom into those that won't have anything to do with any episodes past Johto and those that openly embrace the newer episodes.
Two divides came after Best Wishes started. The people who felt the anime had dropped in quality past its first season enjoy the series for generally feeling like a return to form in pacing and style, while the people who enjoyed the anime and thought that it improved past its first season hate this "step backward".
Generally, Diamond and Pearl vs Best Wishes, due to the sagas being so different from each other.
On that matter, there's a divide between people who like the anime nand people who think it does more harm than good for the games. The latter tend to want a more mature adaptation that's truer to the games, like Pokémon Origins.
There's large debates between adaptations, mostly "Adaptation vs Anime" though "Pokémon Special vs Other Manga" isn't unknown.
On the other hand, every time a new series is revealed, expect half the fans to scream about how such-and-such plot element is lifted directly from an earlier series, while the other half sighs and says "It hasn't even come out yet, shut up and give it a fair chance."
This was especially true when SEED came out, as certain parts of the fandom were writing scathing reviews months before the series even premiered.
Though one would think it to be the one exception Gundam has to this trope, fans view anything involving the Universal Century in three ways. The first is that it is utterly sacred and beyond criticism, with some fans even presenting UC series in a near religious context (no joke, this troper frequented one such MB), while decrying anything non-UC as less than perfect. The second is that UC, much like the original Star Trek, is outdated and vastly overrated, with UC fans often being accused of liking UC series simply because "it's cool" and acceptable to do so while series like Mobile Suit Gundam ZZ (a series that, despite being within UC, is far from perfect) are frequently brought up to annoy said UC fans. And then there's the rest of the Gundam fanbase that watch UC series alongside AU ones and enjoy them like any other series, seeing them as part of a whole as opposed to an entirely different branch.
Wing in particular has its own battle lines drawn, generally with three sides. Some old-school Gundam fans dismiss the show as plotless tripe intended to titillate female viewers, using plot elements outright stolen from older, better shows. The Yaoi Fangirls who appear to dominate the fandom only care about the cute boys to the exclusion of everything else, and because they're vocal, the first group and even non-fans tend to paint Wing as a Boys Love series despite the No Hugging, No Kissing and het Ship Tease laid out by Word of God. The last faction are the people who enjoy Wing honestly and are tired of being painted as idiots or drooling fangirls by (or because of) the above two groups.
Oh lordy SEED. Perhaps the biggest example of this trope, even by its own franchise's standards. Even before Destiny came out, SEED was either really loved or really hated, depending upon who you asked. And when Destiny did come out, well, it only grew more intense.
Though not as intense as SEED before it, Mobile Suit Gundam 00 has its own broken base. Much like UC, some fans see it as the perfect Gundam series, to the point that the same practices that got Destiny canned with the Western fanbase (shoddy writing, character derailments galore, Messianic emphasis of main characters, etc.) are often overlooked by the same people in 00. Other fans, obviously, see it as little better than the preceding series and use it to reinforce the belief that Gundam as a whole has jumped the shark. And of course, there's the rest who enjoyed 00 for what it was and think nothing beyond that.
When Mobile Suit Gundam AGE was announced, many fans were upset Sunrise didn't want to make a Grimdark Gundam, based solely on the more "kiddy" art style. These initial complaints have been rendered Hilarious in Hindsight now that AGE's story has been revealed to be among the darker Gundam series.
Gundam AGE isn't out of the woods however, the issue of UNDERSTANDING is often the cause of a basebreaker. People want to see the ending wind up like a Tomino Kill 'em All, without the psychadelic symbolism and more bloodbaths which was actually given to them after two straight series of forced Understanding. Which they got in spades as every single named Veigan died near the grand finale.
Yu-Gi-Oh! has a very broken fanbase, starting within the original series where fans dispute the canon-ness of Noa's Arc, DOMA, and the KC Grand Prix, with many fans arguing that non-manga arcs were never canon and should not have been made. Then after the original series ended, conflicts arose within and around its spinoffs, GX, 5D's, and most recently ZEXAL. There are some who enjoyed GX, some who hated it from the very beginning, and some who watched it through then suddenly began talking about how much they hated it all along. Many GX fans say that it did not end as well as it should have, with some fans complaining that it was cut short to make room for 5D's. Even so, 5D's with its ridiculous motorcycle dueling premise was and is still laughed at and not taken seriously by fans of the original series. But 5D's, small fandom and all, has been generally more liked than GX, leading GX fans feeling like they were left out and that GX became the Black Sheep of the franchise.
The within-fandom hate became so strong that fans of the spinoffs (who felt that their shows were never given a chance) began to call other fans purists (specifically the ones who solely love the "original" series and absolutely refuse to acknowledge the existence of the spinoffs, despite the fact that DM ended ages ago).
There is a small portion of the fandom that dislikes LittleKuriboh's Abridged Series (although they may have liked it at an earlier point in time), on the basis that it "twists" and "makes needless fun of the source material", with most likely unintended disservice to the spinoffs and their fanbases. (e.g. "I just realized what the "D" stands for in "Yu-Gi-Oh! 5D's"! "DONTWATCHIT!" ")
Among that small portion of fandom are the cosplayers and con goers who are tired of having Abridged Series memes quoted/shouted at them by less...considerate...fans, to put it nicely. Then there are the Abridged Series fans who come to believe in false information, because they were misinformed by the man himself.
Manga vs. Anime (which the main differences are in the ending and the general style, of which the anime is more, er, overdramatic) vs. Movies (where the entire second arc is cut and the ending drastically changed)? And do the Light NovelsAnother Note and/or L: change the WorLd and/or the filmL: change the WorLd count as canon or not?
Tenchi Muyo! Are the original OVAs the superior Tenchi series, or is Tenchi Universe better? Is the 3rd OVA legitimately good, okay but flawed, or a complete pile of crap? Is Tenchi in Tokyo a perfectly enjoyable spinoff, or is it a complete waste of time that flanderizes all of the characters? Is GXP a well-done sidestory that fleshes out the OVA's setting, or a fanservice-filled mess of epic proportions? Should Pretty Sammy be considered a Tenchi series? Should the Tenchi Muyo manga be considered canon? The world may never know.
The Endless Eight arc of The Melancholy of Haruhi Suzumiya anime has sharply divided the once-strong fanbase. The main problem wasn't that it was adapted, it's that one small story was adapted into 8 full episodes with the exact same events each time, and that those 8 episodes took up the majority of the second season's episode count. Add in the fact that the fandom were expecting, after being teased that it would happen, that the series' probably most celebrated story arc would be adapted that season and instead got Endless Eight without being told how long it would last, so a lot of fans kept clinging to the hope that EE would end soon and the next arc would start, but with every new Endless Eight crushing that hope, well, you can probably see where some fans are coming from.
Unique in that it managed to not only split the fan base, but the entire cast and directing crew as well. Some people got in serious trouble over Endless Eight and the fan reaction.
Fans of Neon Genesis Evangelion split over which ending is "better": the original TV series ending or the one from End of Evangelion. Or whether these two are technically the same ending.
And this will likely turn into a three-way split once Rebuild of Evangelion ends, as one of the first things the writers said about it was that it would have a different ending.
It turned into a four-way since the manga had a different ending.
Rebuild is its own controversial topic. Plenty of fans who disliked the postmodern-existentialist sermons of the first series appreciate that the Rebuild movies are more subtle about messages. Others think that removing all that "cheapens" or "dumbs down" the work, turning it into a more typical shounen/mecha.
Good luck finding something Eva fans are NOT split over. Topics of contention include: meaning (or lack thereof) of the religious allusions; degree of sympathy (or lack thereof) for the characters (every. single. one.); quality (or lack thereof) of the English dub; and the specific meaning (or lack thereof) of the series itself. And those are just the biggies.
The nature of Shinji'srelationship with Kaworu has been a contentious topic in the fanbase ever since episode 24 of the TV series first aired. Those who see it as romantic now have Word of God on their side, but that's unlikely to stop the fanwank on both ends... especially with the Rebuild movies now underway, which seem to be focusing more on the boys' relationship than the original series did.
Fairy Tail fandom is extremely divided on the subject of Jellal Fernandez. A major player in Erza's backstory, he made his appearance in the Tower of Paradise arc, which concluded with the manga's hundredth chapter, although technically, he'd been around since the second page of the first chapter. He has appeared in every single arc since then, in some form or another, and opinions are very mixed on if this is a good thing or not. One large segment of the fandom thinks that the unfolding drama is interesting, another thinks that he's worn out his welcome and needs to go away for good. Divisions are, unsurprisingly, very often drawn along fandom lines.
Bleach. Either you're for Ichigo/Orihime, Ichigo/Rukia or accused of being one of the two for raising an objection to a non-shipping related opinion given by a rabid shipper.
There's even more: Aizen'sVillainous Breakdown, was it a case of Villain Decay, or was it a believable Villainous BSOD that he only had coming? To elaborate, some say that his extreme arrogance, over-reliance on brute force and complete foregoing of tactics or his Zanpakuto's illusions once embedding the Hogyoku into his chest, as well as the desperate rants that came when he started getting curb-stomped, were not only bland and predictable, but served as a cheap ploy to make The Hero beating him easier—since he wouldn't use anything else that couldn't be beaten with brute force. They claim that he was stripped of everything that initially made him a convincing, interesting villain, because the author was too lazy to write around an consistently smart Final Boss.
However, on the other side, others claim that, only very rarely do villains portray serenity as they fall, and that their calm facade is shattered as reality hits them with a ton of bricks, reasoning that even Aizen isn't any different. They even analyze that, if people take him losing his temper unbelievable, then the author maybe dragged out the Big Bad being an emotionless prick only capable of smirking and prone to making long, unnecessary lectures for too long.
There's some Broken Base reaction to the Thousand Year Blood War arc, as well. Many fans appreciate the Darker and Edgier turn, with protagonists dying for the first time and a set of villains who disregard Honor Before Reason battle tropes. The arc has also been rapidly resolving questions that had been left open for years, making the plot much less predictable. Others feel that Soul Society's reactions have been uncharacteristically stupid, the villains are not as compelling as individual characters as the Arrancar, and Ichigo is approaching Canon Sue status. How well the arc wraps up may determine what the consensus verdict eventually is.
The designs for Squad Zero. Sufficiently quirky and unique, or goofy looking and looking like they stepped out of an entirely different series?
Hayate the Combat Butler. Serious vs Comedy story. Athena/Anti-Athena. Whether Athena leaving is good for the story or not.
The anime of Umineko no Naku Koro ni leaves fans somewhat... polarized. Whether it's an enjoyable anime and a decent adaptation, an enjoyable anime but a mediocre adaptation, or a downright awful adaptation that does not exist (seriously—there are people who do go as far to as to claim the anime never existed), is not an issue you really want to bring up, especially if you've only seen the anime.
The manga VS anime version of The Violinist of Hameln. The tone of the anime is very serious, whereas the manga is a dramedy, and most characters had a personality change. A lot of fans find the anime superior, whereas most fans of the manga will not talk about the TV series. The TV series is not canon, but the OVA is based off the anime, leading many fans of the TV series to likewise hate the OVA and pretend it doesn't exist, whereas fans of the OVA often hate the TV series.
Ultimate Hellsing/the manga VS the Hellsing TV series.
And then there's Alucard's relationship with Integra. Are they lovers? Is it a one-sided crush for either character? Do they end up together? Or are they purely master/servant? The fandom can't fully agree one way or another. It doesn't help that Kouta Hirano (the creator of Hellsing) himself is a fan of Alucard/Integra.
There's also the long standing debate about who's the strongest human - Krillin or Tien. The term is more often used in reference to Krillin, between video games saying so and Yamcha's actual declaration that Krillin's the strongest human in the Buu Saga. On the other hand Tien's battle accomplishments (though fewer as he's a much more minor character) often seem to some viewers as much more impressive than Krillin's. To be fair, there is a good possibility that Tien isn't entirely human, making the statement that Krillin being the strongest human not so farfetched
The character of Broly has a very strong influence on the fanbase, sparking countless debates regarding his level of strength. He also has an astounding number of die-hard fanboys for a non-canon character.
There are still many debates about who is stronger between SSJ3 Goku and Ultimate Gohan. The debate also extends to Super Buu vs Kid Buu.
Not to mention the major divide between the "manga fans" and "anime fans" since the former basically declared Canon Discontinuity ever since the first season of the anime decided to go more into Yaoi panderingFanservice and making up its own story line with roughly the same characters instead of actually adapting the source material (Only one arc was properly adapted without adding filler/original content). This meant the entirely original second season got even more hate since it meant that the "Noah's arc circus" Storyline would never be animated.
The Yaoi and Shota aspects themselves can be a major Base Breaker as well, since the manga had it be a humorous side element, which was never meant to be taken seriously, and is easily ignorable to those who find it too Squicky while the anime focuses more on it which resulted in it being the major "theme" of the second season, isolating any non-fujoshi members of the fandom (of which there are many).
Among Spanish speakers, Spain-Spanish subs vs. Latin America-Spanish subs (Dubs too, for that matter, but subs aim to the same audience, dubs to different ones). The Latin Americans will accuse Spanish dubs of being crappily done (When Latin American subs have an high percent of subs translated from English in a way too noticeable) while Spaniards will retort Latin American dubs use too much slang (While the most praised Spain-Spanish fansub group, AnimeUnderground, is just as bad, if not worse when it comes to using slang and swears) It's because of this subs in Neutral Spanish have showed up, which being more like Neutered Spanish, please nobody and only serve to prove the Golden Mean Fallacy. No wonder quite a few people Take a Third Option and use English subs, which are faster anyway. (But have their own issues...) It happens with basically every show. Latin American Spanish has way too many differences with European Spanish that you might wonder if it is still the same language, unlike American/British English, which is not THAT different.
Latin American dubs vs. European Spanish dubs is a common Youtube comment section topic. Defend Latin-American dubs and you will be labeled as a barbarian who copied the "mother language" and corrupted it beyond recognition. Defend the European Spanish dubs and you'll be accused of being a whiny princess that can't even bother to pronounce names properly. The arguments get more heated on Western productions since that last pronunciation argument is more noticeable, but Japanese dubs have their own fair share of debate. Expect a lot of swearing.
Inside Latin America as well, it is debated which country makes better Dubs, and which one is more understandable. Each country has specific slang and terms that differ from other countries and often in regions of the same country, and attempts to keep the dubs neutral render rather ridiculous results often, with nobody at all understanding most of it. And as imaginable, each place has a different accent, and nobody can point to which is the most neutral. Big battles over which accent, Mexican, Venezuelan or Chilean is more enjoyable never end in agreement. Often, Argentina has its own dubbing, because it is the most different and specific kind of Spanish in the continent, they have trouble understanding the outside versions and the outsiders have a hell of a time trying to make out what that's supposed to mean.
One Piece. Try suggesting that maybe Boa Hancock, Perona, or Jimbei will be the next crewmate...or any character for that matter, and watch the fireworks.
This is pretty much over now that we know that at least two of them definitely aren't joining.
Or which filler arc was the best...though a general agreement is that the Apis arc sucks.
Depending on what forum you're on, hatred for Ace can run deep. Same goes for the monster trio. There's a sort of divide between Straw Hat lovers and Supernova (minus Luffy and Zoro) lovers as well, in certain places.
Fans are also divided on Strong World's (the 10th movie) place in canon. It was written by Oda and a Chapter 0 was created to tell the main villain's backstory. Considering Brook's in the crew and it's pre-time skip, it takes place between Thriller Bark and Saboady Archipelago. But some fans use Zoro's injuries in the former to "prove" that Strong World isn't canon. It's a mess.
For the anime recently, filler vs. padding has been an ongoing debate.
On one side, you have the folk who appreciate the fact that the producers have been rolling with the one-manga-chapter-per-episode ratio recently; destroying the need of forcing out more agonizing filler arcs, like the previous mentioned Apis arc, to extend the anime's gap from the manga.
The other half of the fanbase isn't as appreciative, and finds that animating just one manga chapter per episode doesn't equate to being enough material to make a well-directed episode without having to stretch out certain scenes, or force in filler moments that overlap with the manga material.
Nanoha FORCE and Magical Girl Lyrical Nanoha Vivid mangas. ViVid was well received, but a significant minority of readers who had been fans of StrikerS and the sci-fi direction the franchise had gone in looked down on it. Force, meanwhile, is rarely viewed with better than neutrality; it has almost completely ditched the Magical Girl elements, has a male protagonist (which set the Bishojo and Lolicon fans up in arms) and set off a Lensman Arms Race of Story Breaker Powers, which angered the science fiction half of the fandom.
Regarding ViVid, it seems the Broken Base around it has been fixed. The catch is that they're fixed against it, due to it's lack of plot and underagedFanservice. It's telling the scanlations for both ViVid and FORCE are months behind.
The first split in the fanbase actually happened when StrikerS came out. Either you loved the new focus on the franchise's sci-fi elements or you hated that the Magical Girl half of the series was reduced to a few bells and whistles.
Though still other fans feel that the sci-fi elements were interesting in principle, but the execution was sorely lacking.
Super Dimension Fortress Macross versus Robotech wars sometimes occur. A bad example flared up on the MacrossWorld forums after AnimEigo announced they had squared the circle and cut the Gordian Knot and gained a license to release the original Macross on DVD. Numerous Robotech fans descended on the MW forums to complain that this somehow spelled the end of Robotech. Flame wars became frequent.
Many Robotech fans express frustration with Robotech fans who approach Robotech as thought the Masters and New Generation segments don't exist. Some Robotech fans are demanding more Rick Hunter and Macross era characters, perceiving them as the true core of the Robotech franchise. They bashed Robotech: The Shadow Chronicles due to its almost exclusive focus on mostly original characters with some supporting New Generation (Mospeada) characters. Other fans strongly feel that although they may consider the Macross Saga of Robotech their favorite, those characters have told their story and it is more appropriate for them to move aside in favor of newer characters and plots.
Slayers has had several variations of the broken base: the first is the third anime season, Slayers TRY: in the late 90's/2000's when it came out, it deviated in formula and story from the first two seasons (darker plot, downplayed humor, and one villain to chase as opposed to a multitude), and the main characters become peripheral to Guest Star Party Member Filia and antagonist Valgaav. Because of this, it's either the most well-loved season or regarded as a piece of crap - it's even referred to as such by some professional reviewers.
Then when the fourth and fifth seasons, which had been shelved for a decade, were finally released, divisiveness was cast on both of them on whether they were a welcome addition or completely unnecessary; the quality of its story is also a hot-button subject.
When the light novels came out, out comes a split between those fans and anime fans, not just for the story, but for characterization - the Idiot Hero Gourry in the novels acts stupid for fun and is a jokester, while he's a borderline Idiot Savant in the anime with a good heart; Zelgadis is colder but more dignified, Amelia is far more mature, and Lina doesn't run on a Hair-Trigger Temper and is nowhere near the bully or near-God-Mode Sue she is in the anime (and to go with that is if she's still a landmark example of a female protagonist or a case of both Creator's Pet and Designated Protagonist Syndrome). There's also the movies, which also have a different dub than the TV series...
Characters of TRY: is Valgaav a Jerkass Woobie who had the right to be angry at those who slaughtered his race, or was he just an emo,crazy villain who wanted to nuke the world and have it reborn with no thought of what might happen? Is Filia a strong yet naive, funny addition to the team, or is she a Holier Than Thou bigot who refuses to help and can't learn at all?
The prequel novels have been running since the early 90's. Mind that the original series ran from that time until 2000, and the prequel is still running. There's debate now on if it's still a good read or old hat that needs to be dropped, and there's also a vocal minority that wants the main storyline to continue, which Word of God stated that he won't do.
Planetes fandom, while mostly remaining genuinely civil, is still rather sharply divided over the anime/manga lines. While both sides generally admit both incarnations' strong points, many manga fans feel that anime is too melodramatic and tries to hide from the serious issues raised in the original behind the curtain of Wangst and slapstick. Anime fans, OTOH, often find the manga too cerebral and filled with Contemplate Our Navels moments, leaving it somewhat dry.
The Persona 4 anime. Things went well until we reached the anime renditions of the Shadow Kanji fight and the Horrible Camping Trip. Much, MUCH wank has ensued.
Fan opinion of Chuunibyou Demo Koi ga Shitai!'s Nibutani, while initially overall positive for being a beautiful girl without apparent defects, immediately started to split after the events of Episode 4. On the one hand some fans like her true character comparing it with Ami from Toradora! thinking she may become a Lovable Alpha Bitch. On the other hand some people now think she is just a Bitch in Sheep's Clothing and don't like her betraying Yuuta's expectations (who actually accepts this quite fast).
Some Patlabor fans prefer the comical TV series. Some prefer the much more serious movies. Other fans like the original OVA which is somewhere in-between the two. Don't even get us started on Wasted XIII which is either a great science fiction mystery-thriller or a boring, cliched film that has nothing to do with Patlabor outside the last five minutes.
There's a lot of debate over the various subs and dubs as well, one of the biggest centering on the original English dub of the TV series which is either a terrible atrocity or oddly fits the screwball cast.
Cardcaptor Sakura: The romance between a elementary school aged girl and her teacher. Fans either loved it (and found it fitting with the series' moral) or found it absolutely disgusting and/or disliked the sugary way it was treated.
Among translators of anime/manga/visual novels: keeping or not keeping the Japanese Honorifics? Some think it reinforces the Japanese flavor, and that it gives informations on relationships between the characters that would be Lost in Translation otherwise. Others think that keeping them gives the impression of a lazy, half-assed translation, and that the aformentioned information can generally be translated in another way or is given by the context anyway. The issue gets even more complicated when said honorrifics are used in nicknames (like, say, "Kei-chan"). Add to that the sibling terminology (nii-san/nii-sama, tō-chan/otō-san/otō-sama, etc.) and some cases where honorifics are added to common nouns, and no two translators can agree on what to do. Even official translations aren't protected from it.
Pretty Cure has one of the most broken fanbases ever. For every fan of one series, you have another fan that despises it.
The anime is despised by a faction of fans for its shortcuts and cheap animation tactics, along with whitewashing several character. Others don't mind the anime, or consider it their gateway into the series.
The controversy over the South Korea character note which lead to him being abruptly dropped from the anime due to internet protests by Korean netizens caused a rift, along with some ongoing debate as to whether he isn't that bad of a stereotype or highly offensive and shameful.
The very setting of WWII is of course, subject to controversy even among fans. Is the series better when it's focusing on the war and "more historical" stories, or was it better for Himaruya to divert his attention to other eras? A quite heated debate.
FUNimation's dub broke the fanbase even more, with groups of fans declaring it and anyone involved in it or that viewed it racist due to the heavy rewrites and offensive humor injected into the script (which had included references to the Holocaust and other genocide where there originally weren't any, repeated jokes about Italy and France lacking proper hygiene, jokes of famine, etc.). Other fans criticizing the dub weren't so much concerned over the content rewrites, but the characters' voices becoming heavily-accented and nothing like the original actors'. And yet at the same time, there are many fans of the dub, which causes the ongoing feud to barely die down.
The very existence of female nations in the series. Fans argue whether Himaruya is being unintentionally sexist in not including more of them, intentionally misogynistic, if there should even be more women, or if the male nations are more worthwhile to focus on and if the female ones are just "useless" filler.
Ship wars make up a big part of the broken fanbase, along with staggering amounts of alternative character interpretation by fans.
The existence of Nyotalia is major grounds for disputes, with fans arguing over whether it should exist and if it would potentially steal focus away from the canon nations. There is also the debate over whether the Nyotalia girls are more feminist and appealing than the ones in canon, or if they're incredibly flat characters or just seen as fanservice. Nekotalia (stories surrounding the nations' cats) is either seen as cute or earns accusations that Himaruya is pandering too hard to fans of moe content. Even the Mochi side strips can earn much debate and arguing.
"2Ptalia", which spawned from Himaruya's alternative colorings/personalities for characters, was spun off into its own series of character redesigns by different fanartists. Where the base breaking comes in? Some laud the fans' 2P recolorings as Better Than Canon and bash the originals, while others will bash the 2P versions and insist that they're mockery of the original.
England's name. It's common to hear fans call him "UK" and even canon uses it sometimes. It's not uncommon to see fans get mad about others using it though, especially since there are other characters that embody UK countries.
To add to the ever-present Subs vs. Dubs debate, there is the curious case of Science Ninja Team Gatchaman and its multiple English adaptations. While Battle of the Planets is lambasted for turning the franchise into a joke and being one of the early examples of Macekre, there are just as many fans that will defend the flaws present (or love it in spite of such) and insist that it is the superior dubbed adaptation by the fact it came first, had a high budget, and was a source of much '70s childhood nostalgia.
7-Zark-7, the robot added into the first adaptation, is widely hated, although there are a group of fans that will defend him and see him as just a legitimate character, to chagrin of the fans that don't like him.
G-Force: Guardians of Space (the second English adaptation) has less of a vocal fanbase, although its fans can go head-to-head with those of the BOTP faction. In discussions, users from each group can stand the chance of relentlessly bashing the adaptation (and its fans) that they didn't grow up with, while defending the flaws present in the one from their own era. With G-Force, the debate becomes a matter of if it only ruined Gatchaman further with the corny names chosen for the characters and the infamously rushed dub job. On the opposing end, G-Force fans will say it's the closest to the source material (before ADV's dub) and that alone makes it better than Sandy Frank's version. This base breakage even goes as far back to Usenet fandom days, when BOTP fans became angered that Cartoon Network opted to run the "inferior dub job" rather than what they knew best as kids.
ADV's Gatchaman dub is not without its own splitting of fans. While closest to the source material, it took some very creative license with dialogue, adding in some "groovy" slang, profanity, and changing some lines that had been considered iconic to fans. Either ADV's dub gave Gatchaman the justice it finally needed with all episodes translated, or ADV did fans a disservice by bothering to make a new dub and sticking it alongside the more well-regarded Japanese track. A few fans of the older English adaptations also became ticked off, as this meant that the DVD releases of their versions wound up halted.
The Gatchaman sequels seem to get a lackluster reception in general, although the arguments come in as to whether they were even needed or not. Villains such as Gel Sadra and Count Egobossler, while having their own fans, appear to be regarded as poor followups to Berg Katse.
The dub of said sequels, Eagle Riders, has a small group of fans, but is a lot more openly criticized than even G-Force, with the detractor nickname for its creative team having long been "Evil Writers".
Is Red Impulse too irredeemable of a Jerkass for how he treated Ken? Can he be seen as sympathetic at all? It all depends on the fan you ask, and they have very passionate difference in opinion on how the character should be seen.
Jun is either a painfully sexist portrayal of a female character and voted as a "least favorite", or not that bad considering the era with her own share of fans defending her. Reception of her also seems to vary by the episode, due to different writers' interpretations of her.
To put it briefly, fans can even argue over whether the original incarnations of the Gatchaman characters are the best versions, or whether or not their dubbed counterparts were better or worse people for the differences made in some of their personalities and voices. Dubbed versions of Joe seem to get the most controversy, although with Jun, fans seem split between considering her English counterparts as stronger characters and between feeling that they tried a little too hard.
Most recently, this trope is invoked with the existence of Gatchaman Crowds. There are fans that don't mind it being an In Name Only reboot of the franchise and that enjoy it on its own terms, while other fans insist it's a cheap cash-in on the title and that it threatens to ruin the reputation of Gatchaman. The lead character, Hajime Ichinose, has also shaped up to be a Base Breaker in her own right, with fans either finding her adorable or obnoxious.
And it doesn't stop here. The "Homura was wrong" field is further divided between those who think Homura lost her mind or became evil (with some going so far to use it as "proof" that she was Evil All Along) and those who think that she was put in front of a Sadistic Choice ( Let Madoka save her, with the risk that the Incubator attempt something against her again without Homura being able to do anything about it and Madoka being unable to stay with her family, or take matters in her hands, allowing Madoka to live a normal life and keeping the Incubators in check at the cost of everyone thinking she became an evil god?) and so Kyubey and/or the Magica Quartet is to blame for putting her in such a situation in the first place.