* ActorAllusion:
** Kirito is one to Creator/BrycePapenbrook: he was once a virtual reality gamer named Shugo Kunisaki of ''Manga/DotHackLegendOfTheTwilight'' who happens to have the same problem with the video game system as Kirito. Kirito's Spriggan avatar also looks like Rin Okumura of ''Manga/BlueExorcist'', another character voiced by Bryce Papenbrook.
** This is not the first time Creator/CheramiLeigh voiced an ultra-{{badass}} ActionGirl [[LightNovel/ShakuganNoShana who mainly fights with a sword]].
** Stephanie Sheh also voiced another adorable [[Manga/KOn Yui]].
** Creator/MichelleRuff has voiced a [[Anime/TengenToppaGurrenLagann sharpshooter]] before....
** Creator/AoiYuuki voices Yuuki in the Japanese version, and the character's personality is similar to another one of Aoi's more well-known roles as [[Anime/SenkiZesshouSymphogear Hibiki]]. Both are energetic [[GenkiGirl genki girls]] who are always ready for anything and both are [[spoiler: [[IncurableCoughOfDeath inflicted with a condition that will soon kill them]]. Unfortunately, while Hibiki is eventually cured of her condition, Yuuki isn't so lucky...]]
** Creator/HirokiYasumoto is known for voicing TheBigGuy. Guess who voices the giant shopkeeper-axeman-bartender?
* BadExportForYou: The English translation for the Western version of ''Hollow Fragment'' is only slightly better than the Asian version's, meaning there are still [[BlindIdiotTranslation numerous grammatical and spelling errors, some of which are bad to the point where the text may be incomprehensible]].
* DoingItForTheArt: According to his [[http://pastebin.com/5wqHvb5c live commentary for SAO II episode 6]], Reki Kawahara actually traveled to Guam and fired a real anti-materiel rifle to get an idea of how it would feel for [[SmallGirlBigGun Sinon]] to fire such a weapon.
* FanNickname:
** ...or rather detractor nicknames:
*** "Waifu Art Online", specially the ''Aincrad'' arc (curiously, this is the one of the few nicknames that is not necessarily derogatory).
*** "Imoto Art Online" for the ''Fairy Dance'' arc. Also in the mix are "Harem Art Online", and "Incest Art Online".
*** The GGO arc (''Sword Art Online II'' for the anime) has been jokingly referred to as "[[MaleGaze Sinon Ass]] Online".
*** "Sword Fart Online" has also been thrown around.
** On to the better ones!
*** The GGO arc is also been nicknamed StarWars Online, on account of Kirito practically being a Jedi and Death Gun being a Vader {{Expy}}.
*** [[LightNovel/OreNoImoutoGaKonnaNiKawaiiWakeGaNai Kirino]] for Leafa, due to both sharing the same [[Creator/AyanaTaketatsu voice actress]], as well as being the main character's little sister.
*** And fans are also calling GGO Kirito as "Kiriko", of course because he looks like a girl. It went official in the DVD extras for ''II'', as he- ahem, "she" is called as such in the extras.
* FlipFlopOfGod: There is a little bit of this regarding whether Kirito and Sachi had romantic feelings for each other or not.
* HeyItsThatVoice:
** The original Japanese version:
*** Creator/KoichiYamadera voices Kayaba. It's also amusing in hindsight, because he's using [[GhostInTheShellStandAloneComplex Togusa]]'s voice for a villain who wouldn't be out of place in that verse.
*** Creator/ToruOkawa is using his [[GhostInTheShellStandAloneComplex Saito]] voice for Heathcliff. There's also just enough of [[TearstoTiara Demon King Arawn]] in there to make you sit up and take note.
*** Creator/NobuyukiHiyama voices Diabel, a charismatic man who was able to gather a large group of people to hunt down the boss of the first floor. [[DeadStarWalking He dies in the same episode]].
*** [[LightNovel/BodaciousSpacePirates Princess Gruier Serenity]] is [[Creator/HarukaTomatsu Asuna]].
*** Creator/MegumiToyoguchi plays an EvilIsSexy guild leader.
*** Creator/TakehitoKoyasu plays Sugou.
*** Creator/AyanaTaketatsu plays Suguha. [[LightNovel/OreNoImoutoGaKonnaNiKawaiiWakeGaNai My Little Sister Can't Be This Cute]] indeed.
*** HiroakiHirata [[Anime/TigerAndBunny (Wild Tiger)]] is Klein.
*** In the second season, Creator/SoichiroHoshi a.k.a. [[Anime/MobileSuitGundamSeed Kira Yamato]] is... ''Death Gun.''
*** Creator/MiyukiSawashiro is Sinon.
*** Creator/HiroshiKamiya kickstarts ''Sword Art Online II'' as [=XeXeeD=]... [[DeadStarWalking and promptly dies within minutes]], setting the tone for the ''Gun Gale Online'' arc.
** The English dub:
*** Creator/BrycePapenbrook as Kazuto "Kirito" Kirigaya.
*** Creator/CheramiLeigh as Asuna Yuuki.
*** Creator/CassandraLee as Suguha Kirigaya/Leafa.
*** Creator/ChristineMarieCabanos as Keiko "Silica" Ayano.
*** Creator/SarahWilliams as Lisbeth.
*** Creator/PatrickSeitz is Agil.
*** Creator/StephanieSheh is Yui.
*** Creator/KaijiTang is Schmidt.
*** Creator/KyleHebert is both Kains and Godfrey.
*** Creator/LauraPost is Rosalia.
*** Creator/XantheHuynh is Sachi.
*** [[Creator/CristinaValenzuela Cristina Vee]] is Alicia.
*** Creator/ErikaHarlacher ([[VideoGame/AtelierAyeshaTheAlchemistOfDusk Ayesha Altugle]]) is Sasha.
*** Creator/LucienDodge is Keita.
*** Creator/ErikKimerer is Ducker.
*** Creator/KirkThornton is Klein.
*** Creator/MichelleRuff is Sinon.
*** Creator/VicMignogna is the Salamander grunt in Episode 19, the Salamander mage in Episode 20, and one of the slug scientists in Episode 21.
*** Creator/AmandaCelineMiller ([[VideoGame/FireEmblemAwakening Sully and Cherche]], [[Manga/SailorMoon Makoto Kino[=/=]Sailor Jupiter]]) is Yulier.
*** Akihiko Kayaba happens to be voiced by Creator/MarcDiraison, best known for his roles as [[Manga/{{Berserk}} Guts]] and [[LightNovel/FateZero Tokiomi Tohsaka]]. Interestingly enough, his role was miscredited to Creator/CrispinFreeman due to the misinformation from the Wiki/{{Wikipedia}} ''and'' Website/AnimeNewsNetwork, possibly due to Kayaba "sounding" like him early on. [[note]][[https://twitter.com/CrispinFreeman/status/360139887279751168 He also mentioned that SAO was dubbed using non-union actors]] and since Crispin [[UsefulNotes/UnionsInHollywood is a member of the SAG and doesn't have Financial Core status]], this cannot be so.[[/note]]
*** According to Danielle [=McRae=], the voice actress of Karma and Painwheel, she will be voicing a few characters in this anime[[note]]Also stated that this will be her first anime role[[/note]].
** The European Spanish dub.
*** Asuna is [[Manga/FairyTail Lucy]], [[Manga/HighschoolOfTheDead Rei Miyamoto]] and... VideoGame/{{Bayonetta}}! (In the "Bloody Fate" anime adaptation)
*** Akihiko Kayaba is [[Series/{{House}} Dr. House]], of all people.
* LifeImitatesArt: Shortly after the final episode of the anime's second season aired, in which [[spoiler:the players of ALO gathered to pay tribute to a dying player]], [[http://kotaku.com/ffxiv-community-holds-massive-vigil-for-a-dying-player-1673823454 a similar event happened in]] ''VideoGame/FinalFantasyXIV''. Of course, this is also an inversion, as this sort of thing has happened in many [=MMOs=] in the past.
* NamesTheSame:
** Creator/YoshitsuguMatsuoka has voiced another character named [[Anime/HanasakuIroha Kirito]] before.
** Episodes 5 and 6 feature a character named [[Franchise/{{Transformers}} Grimlock]].
** [[Manga/KOn This is not the first time]] that Creator/StephanieSheh voiced a character named Yui.
** ''Yuuki'' Asuna. Konno ''Yuuki''. ''Yuuki'' Aoi (who voiced Konno Yuuki). The ''Yuuki''s are written differently in Kanji, but even then.
* OlderThanTheyThink: Most people starting ''Sword Art Online'' will think the series was inspired by the ''Franchise/DotHack'' series when in reality both series started around the same time in 2002. ''Sword Art Online'' was originally meant as an entry for the Dengeki Novel Prize contest but Reki Kawahara didn't submit it because it exceeded the page limit so he published it as a webnovel under the pseudonym Fumio Kunori. It was only after the popularity of his second novel series ''LightNovel/AccelWorld'' that his publishers convinced him to release ''Sword Art Online'' as an light novel in 2009.
* NoExportForYou: Averted with most of its properties, except for the first [=SAO=] game though it has been included in the second game released overseas and the social network game.
* PlayingAgainstType: Oh hey, it's Creator/ToddHaberkorn! Is he voicing TheHero? ...No. Well, maybe he's voicing the comic relief? ...No, that'd be wrong too. Wait, you mean he's voicing the BastardBoyfriend of Asuna?
* PigeonholedVoiceActor: Ever since her role as Asuna, [[Creator/HarukaTomatsu Omatsu]] has played two other swordswomen with long brown hair: Mibu Sayaka in ''LightNovel/MahoukaKoukouNoRettousei'' (although she is a kendo practitioner), and Nagakura Imari in ''LightNovel/AbsoluteDuo''.
* RelationshipVoiceActor:
** From the Japanese version:
*** [[Creator/ToshiyukiToyonaga Keita]], [[Creator/SaoriHayami Sachi]] and [[Creator/TakuyaEguchi Ducker]] are [[Anime/MobileSuitGundamAGE young Flit Asuno, Yurin, and Asemu]].
*** [[TsubasaYonaga Sasamaru]] and [[KenjiAkabane Tetsuo]] are [[Anime/CardfightVanguard Aichi Sendou and Kenji Mitsusada]]
*** Kirito and [[Creator/HarukaTomatsu Asuna]] are [[LightNovel/BodaciousSpacePirates Sandaime and Gruier Serenity]].
*** 70 years later, Kirito (Masaki) would fall for Sachi (Miyuki) again… [[LightNovel/MahoukaKoukouNoRettousei too bad she has a big brother now]], [[BigBrotherWorship and would prefer nobody else]]. Asuna (Sayaka) attends the same school as Sachi.
*** [[Creator/HiroshiKamiya Xexeed]] was a [[Anime/MobileSuitGundam00 Gundam Meister]], and Asuna was one of the BridgeBunnies for his team.
*** Asuna and Xexeed were also [[VideoGame/ValkyriaChroniclesII classmates at a military academy]], and Asuna was one of the titular superpowered being. Coincidentally, [[Creator/SoichiroHoshi Death Gun]] was also one of the enemies they fought.
** The English dub has a ''lot'' of this:
*** [[Creator/CassandraLee Leafa]], [[Creator/ChristineMarieCabanos Silica]], [[Creator/KyleHebert Kains and Godfrey]], [[Creator/SarahWilliams Lisbeth]], [[Creator/CristinaValenzuela Alicia]], [[Creator/LaurenLanda Sakuya]], and [[Creator/MarianneMiller Recon]] as [[Anime/PuellaMagiMadokaMagica Kyubey, Madoka, Tomohisa, Sayaka, Homura, Kyoko, and Kyousuke]], respectively.
*** [[Creator/CassandraLee Leafa]], [[Creator/ChristineMarieCabanos Silica]], [[Creator/StephanieSheh Yui]], [[Creator/XantheHuynh Sachi]], and [[Creator/AmandaCelineMiller Yulier]] were [[Manga/KOn Ritsu Tainaka, Azusa "Azunyan" Nakano, Yui Hirasawa, Ui Hirasawa, and Satoshi Tainaka and Megumi Sokabe]], respectively. [[Creator/TonyOliver Sigurd]], [[Creator/ErikaHarlacher Sasha]], and [[Creator/ErikKimerer Ducker]] also had a few bit parts here and there.
*** [[Creator/BrycePapenbrook Kirito]], [[Creator/KirkThornton Klein]], [[Creator/ChristineMarieCabanos Silica]], [[Creator/KyleHebert Kains]], [[Creator/PatrickSeitz Agil]], [[Creator/StephanieSheh Yui]], [[Creator/CassandraLee Leafa]], [[Creator/AmandaCelineMiller Yulier]], [[Creator/DerekStephenPrince Kibaou]], and [[Creator/CheramiLeigh Asuna]] are also [[Manga/BlueExorcist Rin Okumura, Shiro Fujimoto, Shiemi Moriyama, Ryuuji "Bon" Suguro, Igor Neuhaus, Kuro, Noriko Paku, Yoshikuni, Reiji Shiratori, and Yuri Frederick Egin]], respectively.
*** [[Creator/BrycePapenbrook Kirito]], [[Creator/MichelleRuff Sinon]], [[Creator/PatrickSeitz Agil]], [[Creator/CassandraLee Leafa]], [[Creator/KyleHebert Godfrey]] and [[Creator/StephanieSheh Yui]] are [[LightNovel/{{Durarara}} Masaomi Kida, Anri Sonohara, Simon Brezhnev, Saki Mikajima, Horada, and Miria Harvent]], respectively.
*** [[Creator/CassandraLee Leafa]], [[Creator/KyleHebert Kains]], [[Creator/BrycePapenbrook Kirito]], [[Creator/ErikKimerer Ducker]], [[Creator/SarahWilliams Lisbeth]], [[Creator/KaijiTang Schmidt]] and [[Creator/ErikaHarlacher Sasha]] are [[NurarihyonNoMago Yuki-Onna, Aotabo, Kappa, Inugami, Sannokuchi, Akifusa Kekain and Wakana Nura]] respectively.
*** [[Creator/ErikKimerer Ducker]], [[Creator/StephanieSheh Yui]], [[Creator/LucienDodge Keita]], [[Creator/SarahWilliams Lisbeth]], and [[Creator/AmandaCelineMiller Yulier]] are [[LightNovel/AccelWorld Haruyuki, Chiyuri, Takumu, Yuniko, and Megumi]]. If you listen carefully, you can catch [[Creator/KyleHebert Kains and Godfrey]], [[Creator/KaijiTang Schmidt]], Yolko (Natalie Hoover), Diabel (Sean Chiplock) and [[Creator/ErikaHarlacher Sasha]] providing additional voices as well. Bonus points for being based on another Reki Kawahara work, too.
*** [[Creator/CheramiLeigh Asuna]], [[Creator/ChristineMarieCabanos Silica]], [[Creator/StephanieSheh Yui]], [[Creator/SarahWilliams Lisbeth]], [[Creator/MichelleRuff Sinon]], [[Creator/CassandraLee Leafa]], [[Creator/XantheHuynh Sachi]], [[Creator/AmandaCelineMiller Yulier]], [[Creator/KyleHebert Kains and Godfrey]], [[Creator/PatrickSeitz Agil]], and [[Creator/LauraPost Rosalia]] were once [[VideoGame/{{Neptunia}} Plutia/Iris Heart, Nepgear, Histoire and Abnes, Uni, Nisa, Gust, Falcom, MAGES., CFW Judge, Copypaste, and Arfoire]].
*** [[Creator/CheramiLeigh Asuna]] and [[Creator/PatrickSeitz Agil]] were once [[Webcomic/AxisPowersHetalia Liechtenstein and Germany]].
*** In a rather dark example, [[Creator/ToddHaberkorn Sugou]] and [[Creator/CheramiLeigh Asuna]] are also [[Manga/FairyTail Natsu and Lucy]], [[Manga/SgtFrog Keroro and Natsumi]], and [[Manga/SoulEater Kid and Patty]].
*** [[Creator/ChristineMarieCabanos Silica]], [[Creator/CristinaValenzuela Alicia]], [[Creator/SarahWilliams Lisbeth]], [[Creator/LauraPost Rosalia]], [[Creator/LaurenLanda Sakuya]], [[Creator/MichelleRuff Sinon]], and [[Creator/KaijiTang Schmidt]] are [[VideoGame/{{Skullgirls}} Filia, Cerebella, Peacock, Valentine, Squigly, Eliza, and Republican Double]], respectively. In addition, Schmidt, Sasamaru (Bobby Thong), and [[Creator/ErikKimerer Ducker]] also spend time moonlighting as members of the Black Egrets.
*** [[Creator/BrycePapenbrook Kirito]], [[Creator/ErikaHarlacher Sasha]], [[Creator/CassandraLee Leafa]], [[Creator/AmandaCelineMiller Yulier]], Diabel (Sean Chiplock), [[Creator/GrantGeorge Xexeed]], [[Creator/LucienDodge Keita]], and [[Creator/KaijiTang Schmidt]] are also [[VisualNovel/{{Danganronpa}} Makoto Naegi, Kyoko Kirigiri, Aoi Asahina, Toko Fukawa and Junko Enoshima, Kiyotaka Ishimaru, Leon Kuwata, Hifumi Yamada, and Yasuhiro Hagakure]], respectively.
*** [[Creator/BrycePapenbrook Kirito]], [[Creator/ChristineMarieCabanos Silica]], [[Creator/KyleHebert Kains and Godfrey]], [[Creator/DerekStephenPrince Kibaou]], Yolko (Natalie Hoover), [[Creator/PatrickSeitz Agil]], [[Creator/StephanieSheh Yui]], and [[Creator/ToddHaberkorn Sugou]] are also [[VisualNovel/SuperDanganRonpa2 Nagito Komaeda, Chiaki Nanami, Kazuichi Souda, Fuyuhiko Kuzuryuu, Sonia Nevermind, Nekomaru Nidai, Mikan Tsumiki, and Teruteru Hanamura]], respectively.
*** [[Creator/CheramiLeigh Asuna]], [[Creator/MichelleRuff Sinon]], and [[Creator/CristinaValenzuela Alicia]] are also [[VideoGame/AbsoluteDespairGirls Komaru Naegi, Jataro Kemuri and Yuta Asahina, and Monaka Towa]], respectively.
*** [[Creator/BrycePapenbrook Kirito]], [[Creator/CassandraLee Leafa]], [[Creator/LaurenLanda Sakuya]], and [[Creator/KaijiTang Schmidt]] are also [[VideoGame/TalesOfGraces Asbel Lhant, Sophie, Little Queen, and Raymond Oswell]], respectively.
*** [[Creator/BrycePapenbrook Kirito]], [[Creator/StephanieSheh Yui]], [[Creator/KaijiTang Schmidt]], [[Creator/AmandaCelineMiller Yulier]], [[Creator/PatrickSeitz Agil]], [[Creator/ToddHaberkorn Sugou[=/=]Oberon]] and [[Creator/MichelleRuff Sinon]] are [[VideoGame/FireEmblemAwakening Henry, Tharja and Kjelle, Owain, Sully and Cherche, Basilio, Male Morgan, Noire and Female Avatar]], respectively.
*** [[Creator/CheramiLeigh Asuna]], [[Creator/StephanieSheh Yui]], [[Creator/AmandaCelineMiller Yulier]], [[Creator/CristinaValenzuela Alicia]], [[Creator/PatrickSeitz Agil]], [[Creator/LucienDodge Keita]], [[Creator/ToddHaberkorn Sugou[=/=]Oberon]], [[Creator/CassandraLee Leafa]], and [[Creator/MichelleRuff Sinon]] are [[Manga/SailorMoon Minako[=/=]Sailor Venus, Usagi[=/=]Sailor Moon, Makoto[=/=]Sailor Jupiter, Rei[=/=]Sailor Mars, Kunzite, Zoicite, Jadeite, Calaveras, and Luna]], respectively.
* WhatCouldHaveBeen: According to Danielle [=McRae=], [[https://www.facebook.com/permalink.php?story_fbid=577081022331865&id=257517404288230 she originally was going to voice]] Yulier, but that role was given to Amanda C. Miller instead.
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