* AscendedFanon: Mr. Karate and Nightmare Geese were actually {{fan nickname}}s before Creator/{{SNK}} officially named them as such in later games.
** Yamazaki became a member of the Hakkesshu because he conveniently shared several snake-like aspects with Orochi.
** SNK says that most of Oswald's background (which has not yet been revealed) has already been surmised by the fans.
** Athena's [[UnrequitedLoveTropes one-sided romantic interest]] in Kyo was purely fanon, until ''KOF:KYO'' and the ''[='98=]'' and ''2000'' dramas strongly hinted that she ''did'' harbor some feelings for him. (And then they dropped the ball.)
* FanNickname:
** In order to differentiate Kyo from his clones, fans often refer to his NESTS depiction as "Shin Kyo" ([[MeaningfulName as in]] "True Kyo").
** [[HoYay Yaoiori]] for Iori, thanks to all of his FoeYay with Kyo. The infamous "Yagami is I'm-a-gay backwards" joke didn't help in this regard; his tendency of throwing out ambiguously gay lines in his special intros with Kyo probably helped even less. This is [[ShipTease teased]] to no end by various official/fan works.
** Fathena for Athena's appearance in ''XII'': {{Moe}}ness and chubby legs.
** Yuri's parody of the [[Franchise/StreetFighter Shun Goku Satsu]], the Yuri Chou Enbu, is sometimes called the Shin Yuri Satsu.
** Kim is sometimes nicknamed as The Beijing King, thanks to the MyWayEntertainment fan dub of one of the ''Fatal Fury'' [=OVAs=].
*** Don't forget "WesternAnimation/TomAndJerry" for [[ThoseTwoBadGuys Chang and Choi]].
** Ralf's Neo MAX from ''XIII'' has been christened as the [[RatedMForManly MAN]]retsuken (a play on Ryo's Zanretsuken), due to the [[AwesomenessIsVolatile overflowing abundance of]] [[{{Badass}} GAR]].
** Robert's [[http://www.youtube.com/watch?v=V1U_5rCax8Y Hien Shippu Ryuujin Kyaku Neo MAX]] is alternatively called ''[[VideoGame/TonyHawksProSkater Robert Garcia's Pro Skater XIII]]'' and [[Series/KamenRider Rider Kick]].
** [[SNKBoss Cheesenitz]] and [[UnfortunateNames Goenadz]] for the Goenitz himself, as well as the Goenitzpin, another [[MemeticMutation meme]] spawned in the wake of the Rugalspin thanks to his new HSDM/[=MAX2=] in ''2002: Unlimited Match''.
** Geese is usually called [[SNKBoss Geeser the Cheeser]] and [[JustForPun Geeseter Bunnie]]. As for his Raging Storm DM, there's the Pretzel due to the move's [[SomeDexterityRequired absurd input command]] that was made that convoluted ''just'' for the sake of nostalgia.
** Krauserspin for Krauser Gigatech Cyclone SDM. Again, blame {{MUGEN}}.
*** Also there's Betty [[http://www.youtube.com/watch?v=IMMJkvY4OUc for an]] [[DummiedOut unused DM]] for Krauser in ''[='96=]''.
** Shingo's notebook full of information on his techniques has been known as both the Manga/DeathNote and GameFAQs thanks to his HSDM in ''2002: Unlimited Match''.
* FlipFlopOfGod: Is this series an AlternateContinuity to ''[[VideoGame/ArtOfFighting Art of Fighting]]'' and ''VideoGame/FatalFury''? What gender is Shion? Is Kula Diamond a clone or just an altered human? SNK can't seem to decide.
** To answer the first question: Is Geese Howard [[SchrodingersCat dead or alive]]? There ya go.
** Luise's profile and storyline in the ''Maximum Impact'' series were written to be deliberately different from one another, most likely to prevent spoilers.
* HeyItsThatGuy: Ray Park who is the body actor for Darth Maul in ''Film/ThePhantomMenace'' as Rugal Bernstein in the live action movie.
* HeyItsThatVoice:
** Athena had Reiko Fukai in ''[='94=]'', Moe Nagasaki in ''[='95=]'', Tamao Satou in ''[='96=]'', Yukina Kurisu in ''[='97=]'', Creator/HarunaIkezawa (a.k.a. [[Manga/KeroroGunsou Momoka]]) post-''[='98=]'' (Ikezawa also voices Foxy), Robyn Gryphe in the English localization of ''Maximum Impact'', Lily Kong in the English localization of ''Maximum Impact 2'', and Miwa Gardner in the English localization of ''XII''.
** Rugal's main voice actor is Toshimitsu Arai, who also voices Heidern. Other [=VAs=] are Creator/BanjoGinga (in the ''[='94=]'' Dengeki Bunko drama CD) and NorioWakamoto (in ''2002'' only; notable in that this is a rare occasion where the fans preferred the original seiyuu ''over'' Wakamoto).
** Jeff Manning (the announcer of the original ''VideoGame/SuperSmashBros.'' and ''[[VideoGame/TatsunokoVsCapcom Tatsunoko vs. Capcom]]: [[UpdatedRerelease Ultimate All-Stars]]'') voices Andy, Ralf, and Shen Woo in the English version of ''XII''.
** While Satoshi Hashimoto, the voice of Terry Bogard, [[ClassicallyTrainedExtra is more recognized for his work in theater]], did you know that he once [[Anime/TransformersRobotsInDisguise led the Autobots]]?
** His brother Andy [[Creator/KeiichiNanba is also]] [[VideoGame/GuiltyGear Axl Low]], who ironically shares a passing resemblance to Billy Kane.
** Shingo is {{Takehito|Koyasu}} [[VideoGame/GuiltyGear "Eddie"]] [[TakehitoKoyasu Koyasu]] [[PlayingAgainstType ...]] All of a sudden, the fact that [[Anime/MobileSuitGundamSEED Mu La Flaga]] [[CatchPhrase "]][[MemeticMutation CAN MAKE THE IMPOSSIBLE, POSSIBLE!]][[CatchPhrase "]] makes ''perfect'' sense.
*** PlayingAgainstType: Yeah, usually when you speak of Koyasu, you think of a cool-headed, suave character. Him doing a HeroWorshipper HotBlooded junior dude like Shingo? Uncalled, but he did it awesomely enough. (And using a tone relatively close to his normal speaking voice!)
** Iori [[KunihikoYasui is]] [[Anime/AfterWarGundamX Rukusu]]. In a bit of an inversion; Yasui's role as Iori is arguably his best-known role, so expect the comparisons to come ''this'' way, not vice versa.
** Igniz is voiced by NorioWakamoto. Nothing more needs to be said.
** [[TheOtherDarrin As of]] ''KOF [[BulletHell Sky Stage]]'' and ''XIII'', Mai [[Creator/AmiKoshimizu is]] [[Anime/CodeGeass Kallen]] and [[Manga/SchoolRumble Tenma]].
** Joe and Gai [[NobuyukiHiyama are]] [[Anime/GaoGaiGar Guy Shishioh]], [[Anime/TengenToppaGurrenLagann Viral]], [[Manga/{{Bleach}} Ikkaku]], [[Manga/YuYuHakusho Hiei]], and [[VideoGame/TheLegendOfZeldaOcarinaOfTime Link]]. (Hiyama is the [[PigeonholedVoiceActor go-to guy]] for HotBlooded characters.)
** Yamazaki and Gato [[KoujiIshii are]] [[Manga/AzumangaDaioh Kimura-sensei]]. Could you imagine them talking about their "waifu"?
** K' (Yuuki Matsuda) is [[Anime/{{Beyblade}} Ralf/Robert Jurgen of the Majestics]], [[Manga/{{Gravitation}} Ken-chan]], [[Anime/TenchiMuyoGXP Tarant Shank]], [[Manga/KatekyoHitmanReborn G.]], and [[Franchise/DotHack Pilocchio]]. Matsuda also voiced various minor characters in SNK drama [=CDs=] before being called in to portray K'.
** [[MemeticMutation "]]'''[[Anime/TengenToppaGurrenLagann WHO THE HELL DO YOU THINK]] MAXIMA [[Creator/KatsuyukiKonishi IS]]?'''[[MemeticMutation "]]
** [[ShihoKikuchi Whip]] is [[VideoGame/{{Tekken}} Jun Kazama, Kunimitsu]], [[Anime/{{Stratos4}} Ayamo Nakamura]], [[Anime/{{Beyblade}} Hilary/Hikari Tachibana]], and [[Franchise/TokimekiMemorial Miharu Tatebayashi]].
** Kula and Lilly [[YumiKakazu are]] [[VideoGame/FinalFantasyVII Yuffie]] and [[Anime/{{Vandread}} Dita]].
** Rock and Ramon [[Creator/EijiTakemoto are]] [[VisualNovel/AceAttorney Reiji Mitsurugi (Miles Edgeworth)]], [[Manga/BoboboboBobobo King Nosehair]], [[ThePrinceOfTennis Renji Yanagi]] and [[Anime/DigimonSavers Banchou Leomon]].
** Xiangfei [[Creator/MamiKingetsu is]] [[Franchise/TokimekiMemorial Shiori Fujisaki]].
** Hinako [[Creator/AyakoKawasumi is]] [[Manga/OutlawStar Melfina]] and [[VisualNovel/FateStayNight Saber]].
** May Lee [[Creator/TomokoKawakami is]] (or rather, ''[[AuthorExistenceFailure was]]'') [[Manga/{{Bleach}} Sui-Feng]] and [[Anime/RevolutionaryGirlUtena Utena Tenjou]].
** Angel ([[TheOtherDarrin well, her first seiyuu anyway]]) [[Creator/MinaTominaga is]] [[Manga/RurouniKenshin Yahiko]] and [[Manga/FruitsBasket Ritsu Sohma]]. Her ''second'' seiyuu (Mayumi Shintani) is [[Anime/{{FLCL}} Haruko Haruhara.]]
** K9999 [[Creator/NozomuSasaki is]] [[Manga/{{Akira}} Tetsuo]]... [[CaptainErsatz no, really]].
** Kusanagi [[Creator/MitsuoIwata is]] [[Manga/{{Akira}} Kaneda]]. [[ActorAllusion He and K9999 even have a]] ''Akira''-esque intro in ''2002''.
** Nameless [[Creator/DaisukeOno is]] [[LightNovel/HaruhiSuzumiya Itsuki Koizumi]] and [[VideoGame/FinalFantasyXIII Snow]].
** Tizoc (Hikaru Hanada) is none other than [[VideoGame/GuiltyGear Sol Badguy]] himself (well, only in ''GGXX''[='s=] Story Mode).
** Hyena [[Creator/BinShimada is]] [[Anime/DragonBallZ Broly]] and [[Anime/MobileSuitZetaGundam Paptimus Scirocco]]. Let that one sink in for a while.
** Raiden (in ''XII'') [[DaisukeGouri is]] [[VideoGame/{{Tekken}} Heihachi Mishima]]. [[AuthorExistenceFailure A moment of silence, please...]]
** Perhaps as call back to her previous work with SNK ([[AsHimself a cameo role]] in ''[[TheAnimeOfTheGame Fatal Fury: The Motion Picture]]'', Cham Cham in ''VideoGame/SamuraiShodown''), Moe is voiced by seiyuu Reiko Chiba. Fans of ''Series/KyoryuSentaiZyuranger'' might remember her as Mei a.k.a. Ptera Ranger.
*** As a bonus, Kyo's other partner Reiji is voiced by Creator/TetsuInada who's done a ''Franchise/SuperSentai'' role or two (most famously Doggie Kruger of ''Series/TokusouSentaiDekaranger''; would be kind of amusing that Kyo in ''[=EX2=]'' is flanked with two Sentai warriors). Aside of that, he's also [[VideoGame/DynastyWarriors Lu Bu and Huang Gai]], [[VideoGame/MarvelVsCapcom3 Ar]][[VideoGame/GhostsNGoblins thur]] ([[MemeticMutation Huzzah!]]), [[Manga/{{Bleach}} Komamura Sajin]], and [[VideoGame/SuperRobotWars Elzam von Branstein AKA Ratsel Feinschmek]]--'''[[VideoGame/SuperRobotWarsOriginalGeneration TRO]][[MemeticMutation MBE]][[http://uk.youtube.com/watch?v=pYsz3ytMQ3Y !]]'''
*** Another ''Franchise/SuperSentai'' alumnus in the series: Athena was voiced in ''[='96=]'' by Tamao Sato, who in the previous year had played [[Series/ChourikiSentaiOhranger Momo Maruo a.k.a. OhPink]].
** Mariko Suzuki, a.k.a. [[VideoGame/{{Xenosaga}} KOS-MOS]], voices Jun Kagami.
** AiNonaka is the seiyuu for Mui Kurosaki. [[VisualNovel/{{Clannad}} Where's the starfish, then?]]
** Creator/SawaIshige voices Sinobu Amou.
** Mignon (Miwa Yasuda) is [[Anime/BlueGender Alicia Whistle]], [[Manga/GakuenAlice Ruka Nogi]], and [[VisualNovel/{{Kanon}} young Yuichi Aizawa]].
** Luise's seiyuu, Hiroko Tsuji, voices Mature in the main series.
* TheOtherDarrin:
** Jun Hashimoto (Andy Bogard's seiyuu in ''KOF '94'') was replaced by Creator/KeiichiNanba in the following game; Nanba has voiced Andy in all subsequent games.
** In ''XII'', Matsuo Matsuo now voices Chin instead of Toshikazu Nishimura.
** Several characters had alternate voice actors/actresses in the ''[='94=]'' Dengeki drama CD:
*** Kyo: Creator/RyotaroOkiayu.
*** Benimaru: Creator/HikaruMidorikawa.
*** Daimon: Creator/RyuzaburoOtomo.
*** King: YumiTouma.
*** Mai: Music/MegumiHayashibara.
*** Ryo: Creator/AkiraKamiya.
*** Yuri: Creator/SakuraTange.
*** Takuma: HochuOtsuka.
*** Rugal: Creator/BanjoGinga.
*** Terry: Creator/TakeshiKusao.
*** Jow: Creator/KazukiYao.
** Katsuhisa Namase voiced Joe in ''KOF '94''. NobuyukiHiyama has taken over the role since.
** Robert Garcia: Kazuhiro "Kay" Inage was replaced by Mantaro Koichi, who voiced Robert from ''KOF '96'' to ''2003''. When Robert popped up as a SecretCharacter in ''XI'' (which was based off of his appearance in MascotFighter ''VideoGame/NeoGeoBattleColiseum''), Inage returned to voice Robert, and continues to do so in ''XII'' and ''XIII''.
** Bunsyu Shinoya takes over for Ralf in ''XII''. In English, Scott Casey in the ''Maximum Impact'' series, Jeff Manning in ''XII''.
** In English, Clark went from Sean Michaels (''Maximum Impact'') to Eric Kelso (''XII'').
** Kim is voiced by Kazuhiko Nagata in ''XII'', succeeding Satoshi Hashimoto (Hashimoto still voices Terry, though).
** Akoya Sogi (who has voiced Mai from the beginning up to ''XI'') has been replaced by Creator/AmiKoshimizu as of ''KOF Sky Stage''. Given that Sogi has apparently retired, it's a safe bet to assume that Koshimizu will take over in all subsequent appearances. This could also be the reason behind Mai's absence in ''XII''.
** For Kyo, Andrew Roth (his English VA in the ''Maximum Impact'' series) was replaced by Peter von Gomm come ''XII''.
** Between ''[='94=]'' and ''[='98=]'', Athena's voice changed as much as her clothes, with one for every game. In order: Reiko Fukai, Moe Nagasaki, the aforementioned Tamao Sato, Yukina Kurisu, and lastly Haruna Ikezawa, which was the one who stuck. It can be presumed that this was because SNK was testing out seiyuu for her.
* TalkingToHimself:
** Brian Battler shares a seiyuu with Kensou, Eiji Yano. Yano was also the announcer for ''2002'', as well as Krizalid's voice in ''2001''.
** Toshimitsu Arai, the voice of Rugal, also voices Heidern, as well as Original Zero and Saisyu (only in ''KOF '95'', though).
** Jeff Manning voices Andy, Ralf, and Shen Woo in the English version of ''XII''.
** Satoshi Hashimoto voices both Terry and Kim.
** Hiroyuki Arita, the voice of Chang, also voices Silber in ''XI''. Yoshinori Shima, [[TheOtherDarrin his original seiyuu]] from ''[='94=]'' and ''[='95=]'', also voices Clark, Eiji, and Goenitz.
** Toshikazu Nishimura voices Chin and Heavy D! in ''[='94=]'' and ''[='98=]''. Josh Keller (who voices Chin in the dub for ''XII'') also voices Duo Lon and Kensou in the same dub.
** Hanzo has the same seiyuu as Ryo in ''[=MI2=]'', Masaki Usui, who also voices Goro Daimon.
** Lilly Kane shares [[YumiKakazu a seiyuu]] with Kula.
** Haruna Ikezawa voices Foxy in ''2001'' and ''2002 Unlimited Match'', in addition to Athena.
** Richard Meyer is voiced by Kong Kuwata, who also voices Geese Howard and Duck King.
** Eric Kelso voices Takuma, Clark and Benimaru in the English version of ''XII''.
** Monster Maezuka voices Takuma, Ralf, Benimaru, and Choi.
** Masahiro Nonaka voices Kyo's [[JustifiedTrope clones]], Kyo-1 and Kyo-2. Subverted with evil, magical doppelganger Kusanagi, who is instead voiced by Creator/MitsuoIwata.
*** However, ''KOF [[BulletHell Sky Stage]]'' seems to be using Nonaka instead of Iwata for the voice of Kusanagi, which of course plays this trope straight again.
*** In ''XII'', he shares an Englsh VA (Peter von Gomm) with ''Ash'' of all people.
** King shares her seiyuu (Harumi Ikoma, who also is the announcer in ''KOF '96'', ''KOF '98'', ''KOF XI'', and ''KOF XII'') with Blue Mary. Ikoma also voiced King's brother [[SpellMyNameWithAnS Jean/Jan]] in ''KOF: Kyo''.
** Greg Irwin voices Joe and Robert in the dub of ''XII''.
** Kazuhiro "Kay" Inage (who voiced Robert in ''KOF '94'' and ''[='95=]'') also voices Lucky. Mantaro Koichi (who voiced Robert from ''KOF '96'' to ''2003'') was also the announcer in ''[='97=]''.
* ThrowItIn: Hyena's lines were devised in a collaborative effort between the seiyuu of Hyena, Alba, and Soiree (who consequently became good friends through the experience).
** Krauser's Gigatech Cyclone was actually taken from the [[EverythingsBetterWithSpinning spinning supers]] (i.e. the Senpuuken/Hadou Senpuukyaku) utilized by he and Terry in the ''VideoGame/FatalFury 2'' [[TheAnimeOfTheGame OVA]]. His [[{{Bishonen}} youthful beauty]], lack of a mustache and [[BeautyIsNeverTarnished scars]], as well as an ''authentic German-sounding voice'', the other hand, were not retained, despite being well-received by fans.
* WhatCouldHaveBeen: Beside the various prototype designs of characters (many of which can be seen as Strikers in ''2000''), many plot points were shafted or altered:
** Orochi Iori was originally planned to be the final boss of ''[='97=]'' (remnants of this manifest as Iori being a BonusBoss in said game if you beat Orochi with Kyo).
** Kyo and Iori were going to be dropped from ''[='99=]'' to put emphasis on K'.
** The biggest "what if?" would have to come from ''2001''. One could only imagine what direction the series would have took if SNK hadn't gone bankrupt after ''2000''.
** Even better, this series wasn't even originally a [[FightingGame fighting game]]; it was going to be a [[BeatEmUp beat 'em up]] in the vein of ''VideoGame/FinalFight'' and ''[[VideoGame/StreetsOfRage Streets of Rage]]'' called ''Survivor'' with Terry, Robert, and Ralf as playable characters.
** Athena's appearance in ''XII'' [[http://snk.wikia.com/wiki/File:Athena_rejected_artwork.jpg was originally conceived to be not quite as loli/moe as the final result.]]
** Rugal was originally planned to [[DittoFighter mirror special moves of the characters and use them against them]]. Hardware limitations killed this idea. Rugal's Reppuken, Kaiser Wave, and [[AttackReflector Dark Barrier]] are relics of this idea.
** Believe it or not, it was planned for Terry to actually ''die'' at the climax of ''[='99=]''. Luckily, head management disagreed and brought him back in ''2000'', avoiding what would have been a shocking PlayerPunch and the ensuing barrage of InternetBackdraft. However, the "what if" aspect of his death was played up for the remainder of the saga to the point that Blue Mary told Terry how his teammates ([[ShipTease or more specifically, her]]) were worried about him in the team's ''2000'' ending.
** Kim was supposed to debut in the first ''Maximum Impact'' under the alias of "Mr. Taekwondo", akin to "Mr. Karate". Instead, [[DistaffCounterpart Chae Lim]] took his place, and Kim popped up in the sequel as his good 'ol regular self. Chae Lim herself was chosen over the likes of Jhun Hoon, May Lee, and ''Buriki One'' character Seo Yong Song.
** Originally, Chang and Choi were going to be paired up with another dangerous criminal to from the "Fugitive Team". Kim was a last-minute addition, thus setting up to whole "rehabilitation" plot.
** King's Surprise Rose super move from ''Art of Fighting 2'' was her original DM in ''[='94=]'' but was scrapped for some reason. King's designer then came up with the Illusion Dance DM and it was well received.
** Ralf (and presumably Clark) was supposed to have a moveset revolving around grenades back in his ''KOF'' debut as a ShoutOut to ''Ikari Warriors''. This was scrapped due to a possible case of [[GameBreaker game breaking mechanics]]. Averted in ''XII'', which gives him explosives in addition to most of his trademark moves.
** Heidern's moveset and their names were so strange that the designers were going to make him an alien as explanation for his "abilities." However, the lead designer became attached to the character, giving him a tragic backstory instead and keeping him as a human.
** Saisyu was supposed to have died during his EarlyBirdCameo in ''[='94=]''. His appearance in the following game was a last-minute addition.
** "Chris of the Flames of Destiny" was originally going to have black flames, but the idea was dumped as they would have been too hard to notice in his rather dark stage.
** [[FanDisservice One of Orochi's early designs was that of a naked Chris using an energy ball to attack...]]
** [[http://game.snkplaymore.co.jp/official/kof-xiii/blog/archives/2010/08/post_28.html According to the Developers' Blog]] for ''XIII'', Chang, Malin, Momoko, and Oswald were meant to be in the game. Chang was reduced to a cameo in the India stage, whereas the other three cameo in endings (the Women Fighters Team, Psycho Soldiers Team, and Ash Crimson, respectively).
** Vanessa was supposed to be playable in ''[='99=]'', but didn't make it in time. She makes an EarlyBirdCameo as a Striker in the ''[='99=] Evo'' console release.
** The Neo MAX supers in ''XIII'' were at first created as extensions to normal supers, but because of testing feedback they were eventually changed into stand alone supers. A few Neo MAX supers in the final build still look like they were supposed to follow up on normal supers, some of them only effective gameplay-wise when used as such.
** Adelheid was apparently meant to be playable in ''XIII'', based on some full-body and winpose sketches by Eisuke Ogura.
** If [[http://snk.wikia.com/wiki/File:Adel_and_rose_99.jpg unused]] [[http://snk.wikia.com/wiki/File:Adel_and_99_2.jpg concept]] [[http://snk.wikia.com/wiki/File:Magaki_unused.jpg art]] for ''[='98=]'' and ''[='99=]'' is any indication, it might have been intended for Adel, Rose, and Magaki to join the series as early as the NESTS Chronicles. In particular, one of Rose's prototype designs is shared with that of Whip.
** Foxy, who made her debut in ''2001'', originally wasn't meant to be playable. When it was decided that she'd be added to the roster, it was intended for Diana to join her, although this didn't pan out because of time constraints and Diana remains to this day an NPC.
** Raiden's first playable entry in the KOF series (prior to ''XIII'') was going to be in ''2003'', but the developers eventually decided on using Tizoc instead.

!Misc. tidbits
* The Japanese version's introduction for ''[='98=]'', "Cipher", as well as the ending theme, "Zero", had a sound clip in it with rather vulgar language in it: "Pay dat shit like he just got yo motherfuckin' check and he's gonna pick it up at the bank." In all foreign releases of the game and OST releases, except for the 15th Anniversary CD, this clip has been edited out and replaced with static.