* Code Grease - The show itself, after its Pizza Hut ProductPlacement.
* The main character, [[VillainProtagonist Lelouch Lamperouge]]:
** [[MagnificentBastard Ledouche]]
** Leaplouche - [[http://img171.imageshack.us/img171/3509/1214124275618gn4.gif Episode 11's previews for Episode 12 of Season 2 sees him gaining this new title]]. ''Warning: Light spoilers.''
** [[SquishyWizard Failouche]]
** [[AmbiguouslyGay Fabulouche, Gaylouch]]
** [[MemeticBadass Garlouche]] - Lelouche in the AlternateUniverse manga "Knightmare of Nunnally". Think Franchise/{{Batman}} [[XMeetsY meets]] Series/KamenRider.
** The Pimp - By the middle of R2, he's got half of the female student population after him [[EvenTheGuysWantHim as well as a few boys.]]
** [[DracoInLeatherPants Baby Lulu]]
** Not!Lelouch - [[spoiler:The Military Adviser in ''Akito the Exiled'' named Julius Kingsley looks and sounds exactly like Lelouch with the possibility that Emperor Charles might have modified his memories before he was sent back to Ashford Academy with Rolo before R2]].
* ShelteredAristocrat Suzaku Kururugi has several:
** Uzaku - Derisive nickname, from the Japanese word "uzai", meaning loud or annoying. He's the best-known [[TheScrappy Scrappy]] in the fandom, next to Nina.
** Hax, Hack0r - For whenever he pulls physics defying moves out of his ass. Such as running sideways along a wall, or...
** Spinzaku - For his ability to execute truly fabulous, gravity-defying, and unstoppable spin-kicks. See HurricaneKick for the whole description. This one has magnificently grown into a MemeticMutation.
*** There are a variety of other * zaku nicknames, too, based on specific scenes from the second season, though these are not nearly as popular or justified. These include Drugzaku (after he nearly drugs someone during interrogation) and Runzaku (after he flees from a duel), [[spoiler:Nukezaku (after he nukes the Area 11 capital)]] in ''R2'' 18, Laughzaku or Lolzaku (after his LaughingMad moment while [[spoiler:standing in the remains of the capital he nuked]]), Roofzaku/Spin[[MobileSuitGundam zaku MK-II]] / Ceilzaku ([[spoiler: after performing an upgraded version of his spin kick from the ceiling of the emperor's throne room, breaking the spears of the guards ordered to kill Lelouch after he usurps the throne]]). [[spoiler: Oh, and Zerozaku too.]]
** 7-11 - After he becomes the Knight of Seven in R2. Not actually used in the show, but the producers allegedly made him number seven for that reference. Japan had been conquered and renamed "Area 11", and that number became a derogatory term for Japanese.
** Noodle Jesus - Based off of Jesus Yamato, who some people think he [[{{Expy}} resembles in several ways]]. The "Noodle" part is because he was designed by CLAMP (see above).
** [[Manga/AzumangaDaioh Suzakaki]] - Because he always got bitten by cats.
* [[ProductPlacement Pizza]] Butt - C.C., obviously (she's a pizza-junkie and has a nice butt).
** And there is also Cheese Crust, Cash Cow, Coca Cola and so on....
* Nunn-koma - Nunnally [[Creator/RebeccaForstadt has the dub voice of]] [[Anime/GhostInTheShellStandAloneComplex one of the Tachikomas]].
** She is commonly refered to as "Nunners," including on Wiki/TVTropes itself. It may be her most popular nickname.
* Table-kun - The table that was... uh, "molested" by Nina.
* Racist-tan - Nina
** Table humper or Table-molester: Nina, for above Table-kun incident.
* [[spoiler:Genocide-tan, The Euphinator, The Massacre Princess]] - Princess Euphemia following [[spoiler:Lelouch accidentally Geassing her into killing the Japanese]]. The last is actually used in-series. Another popular nickname for Euphemia is [[GundamSEED Lacus Clone]] [[{{Expy}} for obvious reasons]].
* Nani Mai Huni - Miya, background schoolgirl nicknamed after her [[GratuitousEnglish line]] in [[SchoolFestival Episode 12 of R2]].
* Mr. Cellphone Spoiler - Creator/JunFukuyama, Lelouch's voice actor. The nickname comes from the apparent practice of ''CodeGeass'' staff anonymously sneaking spoilers for upcoming episodes onto 2chan. One such poster made his posts via cell phone; when Fukuyama commented on a radio show that his PC was broken and he could only surf the web via his cell, 2channers made the connection.
* Air - Rivalz, whose relevance to the overall plot of the series is next to nonexistant.
* Radner - Gino. Radner was a name considered for Rivalz early in the show's production; upon learning this, fans joked that he was a separate character, who was Rivalz' EvilTwin. When Gino appeared with a silly, friendly personality like Rivalz, but actually plot-relevant, fans declared that he ''was'' Radner.
* Curly/Emperor Curls - Charles zi Britannia, in referring his curly hairstyle, which coincidentally rhymes with his name.
** Chuck - Used occasionally by a few viewers.
** [[spoiler: Emperocket]] - After R2 episode 21
*** [[spoiler: The Emperor Crusher]] - Again, R2 episode 21. [[spoiler: Before fading to nothingness he launches himself at Lelouch and grabs his throat, but the way it looks seems like he's performing [[StreetFighter M. Bison's]] Psycho Crusher. Ironically, NorioWakamoto also voiced M. Bison. Sometimes it's just referred to as the Psycho Crusher.]] Pictures were shooped, videos were made.
*** Emperor Wakamoto - In reference to his epic seiyuu NorioWakamoto
*** Combining the above two entries gave us [[spoiler: Rocketmoto]].
*** And then the english dub gave us [[http://www.adultswim.com/video/?episodeID=8a2505951e3ac6db011e45a2ac420115 Little Charlie...]]
*** The nickname "Emperor Quaker-Oats" has recently surfaced on the Adult Swim forums, presumably in honor of his hair.
*** Dub-watchers recently started calling him Emperor [[StreetFighter Seth]], for obvious reasons.
*** From a derivative of one nickname, we have Emperor [[Creator/MichaelMcConnohie McConnohie]].
* Ass-Chin - Diethard. Actually used by the staff and cast, including [[Creator/JojiNakata his voice actor]].
* Kallen Stadtfeld/Karen Kouzuki, the local ActionGirl and MsFanservice.
** Wanko, since she is both Zero's Q-1 and his puppy (in Season 1). The Japanese pronunciation of "one" is "wan", which is also the Japanese onomatopoeia of "barking".
*** [[DoubleEntendre Especially]] [[ADateWithRosiePalms funny]] [[DidNotDoTheBloodyResearch if you're a Brit]].
** "Kallen Kasshu", given that her Knightmare Frame has a [[Anime/MobileFighterGGundam Burning Red Hand]]...
*** Making jokes about her being Domon's daughter are par for the course in places. It also helps that Kallen's mother and Rain Mikamura share the same [[Creator/YuriAmano voice actress]].
** Some also call her "Badass Mother" after an [[RuleOfCool awesome]] and [[{{Narm}} hilarious]] line from [[http://www.adultswim.com/video/?episodeID=8a25c392197fafdf011982330e9f01a9 the dub of the first episode]].
** Fanservice Machine - She provides much (though certainly not all) of the show's fanservice.
* NinjaMaid - Lelouch's maid Sayoko Shinozaki, after [[TookALevelInBadass taking a level in badass]] in the second season. AscendedMeme.
** Also Sayokopter, after [[spoiler: her... "particular" exploits as Lelouch's BodyDouble]]. See [[http://www.youtube.com/watch?v=WfFOuJJhiJs&NR=1 this]], as an example.
* Orange-kun - Margrave Jeremiah Gottwald. Used in canon before spreading through MemeticMutation.
** As of R2 the "-kun" honoriffic has been dropped.
** '''STORM OF LOYALTY''' - [[BadAss Self-explanatory]].
* "Kabeko" or "Carve-tan" - The girl who Lelouch Geassed into carving a wall at Ashford Academy every day.
* Code Gay-Ass - A common mispronunciation of the series' name; the correct pronunciation of "Geass" is "gee-ahs." Nowadays, usually invoked for intentional {{troll}}ing. It's also mostly likely in reference to the blatant HoYay in many parts of the show.
** Also, "Code Geese".
* [[spoiler:Marianya]] - Marianne, after the events of R2 episode 20.
* Trollo - Take a wild guess.
* [[spoiler: The other Rolo]] - V.V, after [[spoiler: he's revealed to be Marianne's murderer ''and'' having done so out of jealousy. Since V.V gave the geass to Rolo and both are psychotically devoted to their "brothers"...]]
* [[Film/{{Spaceballs}} Prince Valium]] - [[DullSurprise Odysseus]]. Self-explanatory.
** But it can also be an affectionate nickname, referring to how he is the only person in the show to react to things [[OnlySaneMan in a reasonable, non-over-the-top or melodramatic manner.]]
* Pinkelot - [[spoiler: C.C.'s pink Lancelot]] in the last few episodes of R2.
** [[spoiler: The offical name of C2's machine in those episodes is the Lancelot Frontier...]]
** Someone on the narm page for CodeGeass dubbed it the "[[HelloKitty HelloKittymare]]"; oddly enough, watching the series closely shows that [[spoiler: C.C. has had more than one pink-themed knightmare]].
* Lloyd Aspie - Lloyd Asplund.
* Lulutards - Derisive nickname for the most rabid Lelouch fans.
* Vile-etta [[{{Futurama}} Snu(-snu)]] - for getting Ohgi whipped, and presumably being the X Factor behind [[spoiler:the Black Knights' betrayal of Lelouch]], among other instances of her [[SpannerInTheWorks screwing over Lelouch's plans]]. Snu-snu, screwing over Lelouch, [[IncrediblyLamePun useewutIdidthere]]?
* Lulu Quality - The staff's practice of "playfully" abusing Lelouch throughout the series (see also: TraumaCongaLine). "Playfully" because the writers said that they ''do'' like Lelouch and they wanted him to become a better person, as demonstrated by him learning from his mistakes. Unfortunately, a character with such [[LargeHam large successes]] tends to have [[DiabolusExMachina large failures]].
* Knight Of Fail - Dorothea Ernst -as well as sometimes Monica Kruczewski- for [[EpicFail well..]] being obliterated within seconds by Suzaku, despite being a Knights of the Round and among the best warriors of Britannia.
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