* ActorAllusion: One of the roles of Creator/SumireUesaka in this game is the Fubuki-class destroyer. Not exactly important at first glance, but remember that "Fubuki" is Japanese for "Blizzard". Which brings to mind the RedBaron moniker from another character she played: [[AloofDarkHairedGirl Nonna]] from ''Anime/GirlsUndPanzer''.
* ApprovalOfGod: Bob bookmarks fanart of the girls he is the artist for.
* AscendedFanon: The anime adaptation takes some in-jokes from both the fandom at large and some of the spinoffs and canonizes them.
** Akagi's BigEater status comes front and center, after Fubuki witnesses the '''huge''' platter of katsu (or bauxite) curry she ordered. Kaga gets foisted with this as well come episode 6 (while her serving appears twice as large as Akagi's, it's likely that Akagi was halfway through her plate).
** Ashigara's desperate SingleWomanSeeksGoodMan ChristmasCake status is also referenced by Kisaragi, after rumors of apparently another failed mixer.
** Inazuma's "nanodesu", despite not being used often in the game proper, turns into a proper VerbalTic, used in all but one of her lines in Episode 2 and it gets over-killed in Episode 6 with about 17 instances of it -- the most of out all Verbal Tic-using characters in the episode. And only second to Yuudachi's "Poi~" throughout the entirety of the anime.
** Ooi, while not too far on the crazy side in-game, suddenly goes on a RAEG when Naka takes Kitakami's hand. (Naka's trying to get Kitakami to teach Fubuki.) This may have to do with the [[http://www.pixiv.net/search.php?s_mode=s_tag_full&word=%E3%82%AC%E3%83%81%E3%83%AC%E3%82%BA%E5%A4%A7%E4%BA%95bot Crazy Lesbian Ooi Bot]], an [[NeverTrustATitle actual person]] on Twitter who regularly {{Roleplay}}s Ooi and portrays her as an [[ExactlyWhatItSaysOnTheTin absolutely mad]] ManicPixieDreamGirl who only only loves Kitakami.
** Zekamashi, one of the fan nicknames for Shimakaze, gets used by Kongou in episode 4.[[note]]It comes from how her name is written on her gun cannons, with the hiragana going right to left as was common at the time.[[/note]]
** Raiden, a fan nickname for Inazuma and Ikazuchi, also gets used, again care of [[Main/TheNicknamer Kongou]] in episode 6.
** Nagato displaying a much less serious, far more cutesy and goofy side while in private, as shown in episode 8. Mutsu even teases her about it at the end of the episode.
** After Haruna's second remodel had her with dazzle camouflage, some fans started joking that she wears striped panties. [[http://otakomu.jp/archives/255566.html Cue official art]] confirming that yes, she does.
** Iowa is frequently paired with Kongou in fan art due to their similar personalities. In the browser game, one of her hourly lines has her expressing admiration for the Kongou sisters.
* CastingGag:
** A subtle one in Episode 4 (cris-crossing with ActorAllusion): In order to lure out Shimakaze, the Kongou Sisters begin singing on a makeshift stage in the Naval Base's open grounds, only to be interrupted by Naka, the self-proclaimed IdolSinger of the fleet. Not exactly evident, until one realizes that the StarMakingRole of [[Creator/NaoTouyama the seiyuu for the Kongou Sisters]], was [[Manga/TheWorldGodOnlyKnows an Idol Singer as well,]] and [[Anime/TheIdolmasterCinderellaGirls she also voices/sings for another idol in a different phone game.]]
* ColbertBump:
** Originally [[PeripheryDemographic intended]] to be a niche game catering mostly to the military {{otaku}} population with a modest budget and minimal advertisement, its popularity experienced a '''huge''' surge after its players (including, among others, [[Manga/HellSing Kohta]] [[Manga/{{Drifters}} Hirano]], whose HeroicBSOD on Twitter is most commonly cited as the main reason for the popularity surge) spread the word on Twitter and/or Pixiv.
** Kisaragi's appearance in the anime [[spoiler: and being sunk in episode 3]] has resulted in loads of fan artwork of just her, when before she mostly showed up in group artwork or as a background character.
* CommonCrossover:
** The series overlaps quite well with ''Manga/ArpeggioOfBlueSteel'', despite the latter being a much older series, due to their shared reference pool of World War 2 IJN warships.
** There's also frequent crossover fanart with ''VideoGame/ToukenRanbu'', since both games were made by the same company and hosted on the same website, not to mention that most people consider ''Touken Ranbu'' to be ''Kantai Collection'''s SpearCounterpart.
** On a more individual level, there's a fair amount of fanart pairing(in one way or another) Nagato with Franchise/{{Godzilla}}. Not as surprising as you may think.[[note]]IJN ''Nagato'' was used as a target for atomic tests after the war, and actually survived the first nuke.[[/note]]
* CreatorThumbprint: Several artists use recurrent design elements for their characters, even if they are otherwise very different from one another.
** Shizuma Yoshinori (Nagato, Yamato, Shimakaze, Yukikaze...): Almost every shipgirl drawn by him wears distinctive [[CombatStilettos "Rudder Stiletto" high-heel shoes]]. Other main traits are being eye-catching/fanserice and later on, the designs working in traits of the actual ships (like the bows being the Akizuki class' stomach protection, with Iowa combining the two. The only one with a significantly different shoe design is Akitsushima and they are rudder ''wedges'' rather than the usual stilettos. He also has a thing about sentient turrets, demonstrated with the Rensouhous and the Long 10cm-chan. Coincidentally, all but two of his ship girls feature exceptional stats. The Yamato-class [[InfinityPlusOneSword need little introduction]]. The Nagato-class were the strongest battleships available before the Yamato-class appeared and PowerCreep kicked in. Shimakaze has above-average stats on par with destroyers who have second remodels; Yukikaze has ridiculously high luck apart from having similar maximum stats as the former; Amatsukaze has excellent durability and evasion; and the Akizuki-class have tremendous Anti-Air. Iowa is only second to Yamato-class in firepower and armor, while having superlative LOS and AA...as a ''Fast Battleship''. Only Tokitsukaze features generic Kagerou-class stats, while Akitsushima compensates for her poor stats with her unique gear (A sentient Flying Boat).
** Ayaki (Tenryuu, Murakumo, Nenohi...): Every ship girl drawn by this artist wear some form of [[AntiGravityClothing Floating Headgear]]. Additionally, all but one of them wear bladed anklets in their unremodelled form. They also tend to take on rather dynamic poses and rather eye catching outfits.
** Shibafu (Fubuki-class, Kitakami, Mogami, Ise-class, Akagi, several others...): Unfortunately, the shipgirls drawn by him [[OnlySixFaces only feature the same few faces or so]] as well as relatively BoringButPractical designs. He compensates this with consistent art as well as the tendency for some of his shipgirls to be obsessed with being fitted planes, even discounting his Aircraft Carriers. In spite of his limited style, some of his characters are quite popular and a few being effective yet gotten early.
** Kuuro Kuro (Nagara-class, Ryuujou, Hiyou, Akitsu maru): His shipgirls are usually Shinto-themed. His Nagara-class feature ''[[ZigzagPaperTassel Shide]]'' and all but two of his Aircraft Carriers are [[{{Onmyodo}} Onmyouji]]. Only his IJA shipgirls are removed from this theme. Akitsu Maru ends up being a ''Buddhist''-styled Onmyouji and Maruyu is as removed from the theme as it is possible. He's a very firm believer in BuxomIsBetter with most of his designs being noted for curves (more so after his ArtEvolution, which produced a FanservicePack effect on his older designs)
** Bob: His shipgirls are ColourCodedForYourConvenience as he usually draws whole classes. The Tone-class (2 girls) are Green, the Sendai-class (3 girls) are Orange and the Myoukou-class (4 girls) are Purple. Shouhou is his only shipgirl who is "alone". Zuihou, part of the same class, is drawn by another artist.
* DevelopmentHell: ''Kancolle Kai'' was originally scheduled to be released sometime in 2014. Then it was pushed back to spring 2015. Then to November 26, 2015. Then to February 18, 2016. To add insult to injury, the final delay was announced one month before the scheduled release. While it was finally released in February 2016, many fans fear that the repeated delays have hurt the game's chances. That worry turned out to be unnecessary, as the franchise's sheer popularity have made up for its shortcoming well enough to becoming one of the top-selling PS Vita game at its release.
* FanNickname: [[FanNickname/KantaiCollection Now has its own page.]]
* FandomNickname: Players are referred to as admirals. Unsurprisingly, given the game's premise.
** New players are sometimes called newfaces or newface admirals, from one of Kongou's {{Engrish}} lines.
* FollowTheLeader:
** ''[[http://warship-girls.wikia.com/wiki/Warship_Girls_Wiki Warship Girls]]'' is Chinese game for the Android with a similar premise like Kantai Collection. However, unlike Kantai Collection which features mostly WW2 IJN warships, ''VideoGame/WarshipGirls'' features WW2 Warships from all sides of the War, and is also slated for an English release, which debuted at [=E3=] 2015. However, as of July 2016, due to bad blood between developer [=moeFantasy=] and disturber Patch Games, plans for an english have been put on hold.
** In the US, another Kantai clone is [[https://www.kickstarter.com/projects/blackchickenstudios/victory-belles Victory Belles]], an upcoming Free-to-Play rpg collection game & warship sim for the Web and iOS by American developer Black Chicken Studios. Victory Belles takes it UpToEleven for not only having all WW2 Warships from all sides but having the ship characters voice by actual voice actresses from their respective countries (eg. British ships voiced by British voice actors and Russian ships voiced by Russian voice actors.), thus averting FakeNationality.
* GeniusBonus: The signal flags beside Kashima's beret stands for "[=UY=]", which in Naval parlay means "I am carrying out exercises. Please keep clear of me." Fitting, since she is a Training Cruiser. [[note]][[https://cdn.awwni.me/rptj.jpg Others have interpreted this]] as a reminder to the Admiral [[StopPokingMe to stop flirting with her.]][[/note]]
* IronyAsSheIsCast: Creator/SumireUesaka is well known as a Russophile, yet the role of Verniy was given to Creator/AyaSuzaki. The official 4koma has Fubuki (whom Sumire Uesaka voices) communicating with the suddenly converted Verniy (Hibiki's second remodel) with (supposedly) good Russian, only to reveal that Verniy cannot really speak Russian apart from rudimentary words.
* NamesTheSame: Granted, they are named after the actual warships, so same names are to be expected. However, there is a special case with the upgraded Hiryuu, who shares an exact name with a spaceship from ''VideoGame/SuperRobotWarsOriginalGeneration''.
** PlayedWith in the official 4koma. One possible reason why Fubuki is able to speak fluent Russian (as mentioned in the IronyAsSheIsCast above) is because a previous incarnation of Fubuki (a Harusame-class destroyer) was active during the Russo-Japanese War.
** Amagi shares her name with the unfinished and ultimately scrapped battlecruiser Amagi, who was historically Akagi's sister ship. Some fanartists portray Akagi fawning over Amagi as a result of that, while in 4koma it goes with 'confusing linage' gag[[labelnote:Note]] Unryuu-class girls are technically Hiryuu's children, and it was previously noted that Akagi and Hiryuu are cousins.[[/labelnote]].
* NoExportForYou: The only way to play the game is to register on the Japanese-language segment of the DMM website, which itself is inaccessible to non-Japanese IP addresses. This means to even ''register'' for the game, a prospective non-Japanese player will have to jump through a lot of hoops to do so (usually by using VPN), never mind getting to ''play'' the game, which then requires newly registered members to win a lottery for one of the limited slots per server. And competition is ''steep'' for server slots.
** The January 29, 2014 update was a rude awakening for many foreign players, as the most prevalent method used to play the game (the API link) no longer worked, since DMM had the game purge its API lists every 90 minutes. This meant that anyone who wanted to play via API was now essentially playing on a timer, and they had to hop on VPN to renew their API link when the time was "up". The other choices were playing on the VPN full-time, which carried its own associated risk, mainly a chance of getting banned for using a single IP (as DMM would technically see a single IP used by multiple accounts), or purchasing a private VPN to play the game on. In any case, this caused a ''lot'' of grief for non-Japanese players, causing some of them to drop the game outright rather than face the hassle of renewing every hour and a half. However, said API renewal forced a lot of players to log in simultaneously, overloading DMM's log-in servers, and essentially making the game inaccessible to everyone for hours on end. It was quietly removed in a subsequent update.
** However, API links is no longer a concern. A not-so-recent method involving cookie editing allows any foreign player to play the game properly.
** Since Koreans hate this game, the anime series is not available on Korea[[note]]Aniplus, a Korea-based TV channel, release Kancolle anime only in Singapore and Indonesia and not in their own country.[[/note]]. It isn't available in China, Taiwan, Hong Kong. Merchandise from this game isn't available in those countries, too.
** However, in Singapore and other Southeast Asian countries, basically territories which suffered greatly under Imperial Japan, merchandise and Cosplays of the game's various ship girls are rather popular.
* PromotedFanboy: Jiji, the artist for the Italian ships, has done fanart of the game before. Just don't look for it at work.
* ScheduleSlip: Some fleet girls representing ships from the [=IJN=], the Kriegsmarine, and the Regia Marina, that actually existed during WorldWarTwo have yet to appear in the game. The most blatant case thereof would be that involving ''[[http://en.wikipedia.org/wiki/Japanese_aircraft_carrier_Shinano Shinano]]'': Kadokawa had already released [[http://danbooru.donmai.us/posts/2312428 Alpha Art of her in supplementary materials ''way back in 2013'']], but she has yet to make her appearance as of the Spring 2016 event. And with the debut of the United States Navy into the game (which is known in itself to have a gaggle of Aircraft Carriers, for starters), the wait is expected to become longer.
** When the Shoukaku sisters were given their second remodels, the developers promised they would be able to operate jet aircraft. To further the hype, the [[http://kancolle.wikia.com/wiki/Ne_Type_Engine Ne Type Engine]] was released as part of the November 2015 ranking rewards. Now, eight months later, there are still no jets available.
* ShrugOfGod: The developers are ridiculously closed-lipped about the origins of both the player-controlled fleet girls and their opponents, the Abyssal Fleet, which leads not only to fans making their [[WildMassGuessing own theories]], but even to the '''official print spinoffs''' not agreeing on where they came from.
* SleeperHit: The game was originally meant for the very niche market of military {{otaku}}, but thanks to some {{Colbert Bump}}s from big names in the manga and anime industries (the most notable example being [[Manga/{{Hellsing}} Kohta Hirano's]] epic meltdowns about the game on Twitter) it got a lot more popular than intended.
* TalkingToHimself: With LoadsAndLoadsOfCharacters and only a limited pool of voice actresses, a lot of conversations in the anime tend to become this.
* VaporWare: Of all the fleet girls introduced since 2013, including supplementary materials, ''Shinano'' is the one who falls squarely in this trope. see ScheduleSlip entry.
* WhatCouldHaveBeen:
** The temporarily playable Fleet of Fog ships. Let's just say, if the marriage(temp) system, which was confirmed for eventual implementation before the Arpeggio event started (and was eventually implemented some time after it ended), with the concept for it being leaked out some time before that, had instead been implemented before the event started...
** [[http://otakomu.jp/archives/64.html If the game had failed to take off,]] it would have gone out in a TorchTheFranchiseAndRun fashion with the Bombing of Kure as the final Event, which was planned to coincide with the 68th anniversary of [=VJ=] Day.
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