History YMMV / LogHorizon

** The premise of an MMO being real, with humans having a profound impact on it (and vice versa) was the ambiguous ending to [[spoiler: the game ''Star Ocean: Till the End of Time'']].

** [[https://www.youtube.com/watch?v=0_JAS_bctIY ''Database! Database! Just living in the database!'']] ''Database'' was such an Ear Worm that the second season of the anime opted to keep it as the opening theme, much to the joy of the fanbase.

* EnsembleDarkhorse:
** [[spoiler:Nureha]], one of her rivals for Shiroe's affection, also has a significant following among Japanese readers, though for an [[BrokenBird entirely]] [[TheWoobie different]] reason. She's the one with the ''Courtesan'' (娼姫, literally "whore princess") subclass, by the way.
** After her debut in the anime, Serara is also highly popular among viewers.
** Isaac's popularity exploded, at least amongst the Japanese fandom, after the release of the Black Knight vs. Berserker Drama CD in volume 7's special edition.

** Isuzu and Rundelhaus Cord

* GameBreaker: Basically speaking, [[MaryTzu Shiroe does this on a regular basis]]. His first unmistakable demonstration is [[spoiler: buying the guildhall of Akihabara]]. This is only the first of many such feats and he performs many others... say for example, [[spoiler: unlocking how to promote Landers into Adventurers]]. These things have profound implications that can affect tens of thousands... if not the entire world.

* MarySue:
** [[spoiler:Kanami]]. Readers of her spinoff joke that the only thing missing is for Landers to worship the land she walks on.
** Soujirou manages to fend off a [[spoiler: Royal Guard]], even intercepting it and blocking its blows multiple times, while it's supposed to be impossible to do even once. Bundled with his harem guild, well-liked personality, his rare subclass, and renowned sword-fighting capabilities, people tend to call him [[LightNovel/SwordArtOnline Kirito 2.0]]. More people dislike him after the Black Knight vs. Berserker Drama CD, wherein he effortlessly intervenes in a duel between the two best Guardians on the Yamato server just as they were about to settle it, simply to ''use the space to hang out with his guild.'' Unlike the other guild leaders like Shiroe, Krusty, and even Isaac, Soujiro doesn't really come up with too many strategies on his own for facing enemies, usually just relying on sheer skill and luck. His only [[spoiler:two deaths are both against Royal Guard, who are supposed to be able to one-shot Adventurers, and the second time is against a Royal Guard using a Raid Boss-possessed weapon that boosted the Guard's power even more. Even then, Souji is able to parry and block his attacks for quite a while.]]
* MaryTzu: Shiroe's plans rarely fail and [[XanatosGambit often lead to something]] when they do. Shiroe regularly executes or theorizes exploits that are game breaking, which others find astonishing because they couldn't imagine it themselves [[GenreBlindness (despite how obvious it would be for real world MMO veterans)]]. He is a recognized genius because of these factors, and people want information on whatever he's scheming on the sole merit that it's a Shiroe Plan. He's so good, people in-story wish they had a fraction of the intellect he does. From a Military Science prospective he's demonstrated the genius of Sun Tzu (a battle can be won before it's even fought through planning), Machiavelli (duplicity and subterfuge is justified to achieve a political goal), and Clausewitz (the threat of force is a form of politics)... just to name three major figures out of the dozens he emulates. [[SerialEscalation Economic Science too!]] It's far more detailed in the light novel, but only touched upon the anime to save time, that he's demonstrated insight with John Keynes (father of modern capitalism) and Milton Friedman (a critic of Keynesian Economics with alternative insight) to avoid most obvious pitfalls. Some of the Trade Guild Leaders are amazed at it... despite the fact [[GenreBlindness they should be more knowledgeable]] about those concepts than Shiroe. It somewhat gets lessened due the MMO world's HollywoodEconomics and CastFromMoney being different from 20th and 21st century Earth, but the basic principals are sound. As the story progresses Shiroe will also gain the power of [[spoiler: Combat Clairvoyance]], which obviously needs little explaination to describe how more dangerous it makes him.

* FanPreferredCouple:
** Amongst Shiroe's harem candidates, most tend to ship him with Akatsuki. However, there's a noticeable faction that is rooting for Henrietta, who [[IWantMyBelovedToBeHappy decided not to pursue her feelings in canon]].
** Naotsugu and Maryelle
** Isuzu and Rundelhaus Cord
** Krusty and Raynesia has a following though there are some that consider this more a sibling relationship then romance.
** Nyanta and Serara

* HarsherInHindsight: Minori and Touya's {{EarlyBirdCameo}}s, for those who haven't read the novels, as episode 8 painfully shows.

** Amongst Shiroe's harem candidates, most tend to ship him with Akatsuki. However, there's a noticable faction that is rooting for Henrietta, who [[IWantMyBelovedToBeHappy decided not to pursue her feelings in canon]].

** Amongst Shiroe's harem candidates, most tend to ship him with Akatsuki. However, there's a noticable faction that is rooting for Henrietta, who [[IJustWantMyBelovedToBeHappy decided not to pursue her feelings in canon]].

** ''LightNovel/OverLord2012'' has now shown up on the radar, thanks to a 2015 anime announcement, and is either praised or panned for being a DarkerAndEdgier variation.

** ''LightNovel/{{Overlord 2012}}'' has now shown up on the radar, thanks to a 2015 anime announcement, and is either praised or panned for being a DarkerAndEdgier variation.

** ''LightNovel/{{Overlord}}'' has now shown up on the radar, thanks to a 2015 anime announcement, and is either praised or panned for being a DarkerAndEdgier variation.

** Some of the censorship in the anime, such as the lack of blood, cutting off Naotsugu's perverted lines (courtesy of Akatsuki's flying knees) as a running gag, and hiding Nureha's backstory have caused complaints about the show. However, this is Justified since the show airs on NHK, which is a publicly funded network that caters to children.

** Soujirou manages to fend off a [[spoiler: Royal Guard]], even intercepting it and blocking its blows multiple times, while it's supposed to be impossible to do even once. Bundled with his harem guild, well-liked personality, his rare subclass, and renowned sword-fighting capabilities, people tend to call him [[SwordArtOnline Kirito 2.0]]. More people dislike him after the Black Knight vs. Berserker Drama CD, wherein he effortlessly intervenes in a duel between the two best Guardians on the Yamato server just as they were about to settle it, simply to ''use the space to hang out with his guild.'' Unlike the other guild leaders like Shiroe, Krusty, and even Isaac, Soujiro doesn't really come up with too many strategies on his own for facing enemies, usually just relying on sheer skill and luck. His only [[spoiler:two deaths are both against Royal Guard, who are supposed to be able to one-shot Adventurers, and the second time is against a Royal Guard using a Raid Boss-possessed weapon that boosted the Guard's power even more. Even then, Souji is able to parry and block his attacks for quite a while.]]

** ''LightNovel/Overlord'' has now shown up on the radar, thanks to a 2015 anime announcement, and is either praised or panned for being a DarkerAndEdgier variation.

** Readers of ''LightNovel/SwordArtOnline'' have claimed that a major plot twist of ''LightNovel/LogHorizon'' ([[spoiler: the NPC population is sentient]]) was also in ''Sword Art Online''. It's really a CrypticBackgroundReference, but cited on a few occassions (once in the anime) as a reason why Kirito dislikes having innocent NPC's killed during Boss Raids. Because SAO is mostly a single-person focused story, the matter isn't explored beyond Yui's involvement (and Fina to a lesser degree). Again though: {{Tron}} and {{Neuromancer}} did it first... so it's silly to nitpick.

* HilariousInHindsight: Much of the beginning of Season 2 involves Shiroe trying to figure out how to generate enough funds to pay for the Round Table's upkeep costs for maintaining Akihabara's infrastructure. He then comes across an idea to exploit a hole in the game's logic: mainly, if monsters drop gold, ''where does the gold come from''? His investigation takes him to an underground raid zone where it is rumored that it holds an endless supply of gold. So basically, Shiroe is looking for the fabled [[{{Destiny}} Loot Cave]].

** Adverted with the Odyssey Knights, a group of people who are very much so not okay with being trapped in a computer game. Although, as previously stated, they are not the protagonists. It comes up again when [[spoiler: Landark]] makes his brief return, but his status as a minor villain means that this quickly gets swept aside to focus on other things.

** Adverted with the Odyssey Knights, a group of people who are very much so not okay with being trapped in a computer game. Although, as previously stated, they are not the protagonists. It comes up against when [[spoiler: Landark]] makes his brief return, but his status as a minor villain means that this quickly gets swept aside to focus on other things.

* AngstWhatAngst: The protagonists and other former members of the Debauchery Tea Party take their unexpected imprisonment in a video game surprisingly well, and complain that most of the other players are getting too worked up over it. There ''are'' many players who angst about it, but those players are not the main characters. It helps that their actual lives are not directly threatened; they respawn when killed. The players are more concerned about incertitude and social troubles than surviving.

** The episodes/arcs that usually revolve around the junior members of the Log Horizon guild are found to be quite fatiguing for some people, and just want the spotlight to move on from what they see as [[FlatCharacter less interesting characters]] to follow along with, and would rather see more of Shiroe's adventures, or perhaps pass the spotlight onto characters that they've felt have gotten the [[OutOfFocus short end-of-the-stick in screen-time]] such as Nyanta and Crusty. Doesn't help that Minori suffers from major DieForOurShip regarding her [[TeacherStudentRomance ''crush'']] on Shiroe.
** As mentioned in BrokenBase, Akatsuki's side-story in Season 2 was this for some.

** The animation studio switch from Satelight (season one) to Studio DEEN (season two) split the fan-base as to whether it was an overall upgrade or downgrade. Or, you may even be in the third camp stating that nothing feels different.
** Akatsuki's side-story in season two where she goes after the Christmas killer is very hit-and-miss amongst the fans. Some found that the arc [[ArcFatigue didn't need to drag on for four episodes]], and were getting impatient, because what they truly wanted to see was the action going on in Shiroe's raid on ''Elder Tail's'' gold stash. Others were fine with it, stating that this is what Log Horizon is best known for building up the problem before finally dealing with it, and eventually got to what everyone was begging for; an action-packed final episode of the arc dealing with the murderer. Akatsuki's CharacterDevelopment seen throughout this arc is also a huge plus for some people as it was something that was constantly asked for all throughout season one due to her EnsembleDarkhorse status.

* TheyChangedItNowItSucks: Some fans have complained about Shiroe taking significant damage in their first battle, instead of only trivial amounts in the novel... even though his dwindling health is only used as a cliffhanger for the InMediasRes opening scene, and isn't brought up when the full battle is shown.

** Adverted with the Odyssey Knights, a group of people who are very much so not okay with being trapped in a computer game. Although, as previously stated, they are not the protagonists. It comes up against when [[spoiler: Landark]] makes his brief return, but his status as a minor villain means that this quickly gets swept aside for to focus on other things.

** The episodes/arcs that usually revolve around the kids of the Log Horizon guild are found to be quite fatiguing for some people, and just want the spotlight to move on from what they see as [[FlatCharacter less interesting characters]] to follow along with in order to see more of Shiroe's adventures, or perhaps pass the spotlight onto characters that they've felt have gotten the [[OutOfFocus short end-of-the-stick in screen-time]] such as Nyanta and Crusty.

** The episodes/arcs that usually revolve around kids of the Log Horizon guild are found to be quite fatiguing for some people, and just want the spotlight to move on from what they see as [[FlatCharacter less interesting characters]] to follow along with in order to see more of Shiroe's adventures, or perhaps pass the spotlight onto characters that they've felt have gotten the [[OutOfFocus short end-of-the-stick in screen-time]] such as Nyanta and Crusty.

* HilariousInHindsight: Much of the beginning of Season 2 involves Shiroe trying to figure out how to generate enough funds to pay for the Round Table's upkeep costs for maintaining Akihabara's infrastructure. He then comes across an idea to exploit a hole in the game's logic: mainly, if monsters drop gold, ''where does the gold from''? His investigation takes him to an underground raid zone where it is rumored that it holds an endless supply of gold. So basically, Shiroe is looking for the fabled [[{{Destiny}} Loot Cave]].