''[[http://www.fanfiction.net/s/5365396/1/One_and_only_Son One and Only Son]]'' is a ''CodeGeass''[=/=]''{{Gundam00}}'' crossover written by [[http://www.fanfiction.net/u/288039/Juubi_K Juubi-K]]. The story develops as this: in 2004 ATB, the [[{{Qurac}} Federal Republic of Krugis]] request aid from the [[TheEmpire Holy Britannian Empire]] and the Emperor sends his Knight of One, Bismarck Waldstein to help to stabilize the region. The operation is successful and Krugis is incorporated in the Empire as Area 7, with Bismarck as its Vice-Roy, who allows it to keep its cultural identity.

There, he is impressed by the courage of a street urchin named Soran, who fights until the end while outnumbered and decides to adopt him as his son. As Alexander B. Waldstein, he is the son of the best knight of the Empire and follows the military career, taking account his friendship with Lelouch and Nunnally, the death of Empress Marianne, his knighting by Cornelia and his training in the military academy.

He is eventually transferred to Japan when Cornelia goes there to replace Clovis and meets Lelouch, though he does not recognize him, while the Euro Universe with its team, led by Hamid (This stories equivalent to Ali Al-Sanchez), who helps the Black Knights fight against Britannia.
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!!'''This fic contains examples of the following tropes, in addition to those already present in the source material:'''

* AnnoyingYoungerSibling: Michael Trinity. And what Carline thinks of Nunnally UpToEleven, [[SarcasmMode of course]].
* ArmorPiercingQuestion: Of Type 2, when Princess Marina asks Alexander if he's a boy named Soran and he [[BerserkButton really gets angry]]. But thanks to Mena, they solve the misunderstanding which is not a misunderstanding, they are cool now.
* BerserkButton: See above for Alexander. Same with Cornelia when she ripped on Soran, because he didn't do anything to impede Euphemia to create the SAZ. She felt bad afterward.
* BewareTheSillyOnes: The Skirted Devils are a force of girls that fight in sailor-fuku uniforms and the intelligence reports says that they're one of the most vicious anti-Britannian groups.
* BreakHisHeartToSaveHim: An odd example: Villetta is breaking both hers and Graham's hearts, but she is willing to restart their relationship should Villetta survive the war
* BreakUpToMakeUp: Another odd example between Graham and Villetta after they reunite. Villetta feels that she needs to regain her honor because of what she went through as Chigusa, but Graham doesn't care and loves her either way. But she plans on fighting in the upcoming war to regain her honor and asks Graham if he could wait for her. Of course he says yes.
* BigBadassBattleSequence: The finale of its equivalent of [=R1=].
* BigDamnVillains: [[spoiler:Jeremiah]] saves both Lelouch and Cornelia from [[spoiler:Carline]].
* BloodKnight: Hamid, but he [[FreudianExcuse has reasons]].
* BootCampEpisode: Part of Alexander's CharacterDevelopment, his training in the Benedict Arnold Military Academy is described with detail.
* BreakTheCutie: Soran saw Marianne's corpse and a traumatized Nunnally before Cornelia covered his eyes.
* CallMyName: The last thing that [[spoiler:Alexander]] says is "LELOUCH!".
* ChildProdigy: Jacque Saint-Clare.
* ChristmasEpisode: Chapter 19.
* CoolBigSis: Cornelia is this for Alexander.
* DeadlyDecadentCourt: Carline, she discuss with Nena which siblings they should kill.
* DeathByChildbirth: How Alexander’s mother died in the ''official'' version.
* DownerEnding: [[spoiler:The Black Rebellion is quelled, Lelouch is captured and Alexander fails to protect Cornelia and is defeated by Hamid.]]
* EstablishingCharacterMoment: Hamid has his one when he hijacks a Ganymede prototype in Tal Afar, wreaks havoc between the Krugisian military and then shoots the dog.
--> "Sorry guys, but the bastards win every time. And I'm the biggest bastard of them all!"
* EvilVersusEvil: [[spoiler:Hamid versus Luciano. You cheer for them kill each other.]]
* ForWantOfANail: During the incorporation of Krugis, Bismarck adopts Soran, who was a street boy [[spoiler:and had a brother who likes to call himself Hamid.]]
* FusionFic: Characters of {{Gundam00}} added to CodeGeass universe.
* GambitPileup
* GetAHoldOfYourselfMan: Kati Mannequin to Saji, [[spoiler:after he discovers his sister killed Euphemia.]]
* GrayAndGreyMorality: The EU is not perfect, but it’s [[ALighterShadeOfGrey the lighter shade of gray]] of the setting. Lampshaded by Hamid:
--> “Even the last bastion of freedom and democracy has dirty work that needs doing”.
* GoodRepublicEvilEmpire: Krugis and Britannia. Krugis is portrayed as being pacifists TokenGoodTeammate to Britannia, but which extent of this reflects the Krugisian society is up to debate [[note]]Some readers are even suspecting that Krugis is under AlternateHistoryWank thanks to the Britannian incorporation.[[/note]].
* HairTriggerTemper: Michael.
* HannibalLecture / ReasonYouSuckSpeech: [[spoiler:Carline]] delivers a particular jarring one to Cornelia, when she wonders whether she wanted to make Euphy Empress with the blood of the world.
* HeroAntagonist: Lelouch, especially [[spoiler:after Euphemia's death. Since, differently from canon, she didn't go nuts and it wasn't him who killed Euphemia, Zero tries to set her as a martyr against the Britannian occupation and rally the Japanese.]]
* HeroOfAnotherStory: Basically the entire point of the fic, even if Soran is on the Empire's side.
* HeroicBSOD: Alexander suffers a bad one with Empress Marianne’s death. His father had to tell a GetAHoldOfYourselfMan speech to him.
* HiddenDepths: Bismarck. Starting by the beginning with the fact that he was MarriedToTheJob and never had a son, he is a very honorable man.
* HonorBeforeReason: Hamid chastises the Britannians for this trait.
** And in Fukuoka, it's shown he's NotSoAboveItAll.
* ICantBelieveAGuyLikeYouWouldNoticeMe: Pretty much Shirley. She gets complimented by it by Mena.
* IdenticalLookingAsians: This was the Chinese strategy to place its troops on Fukuoka.
* InnocentProdigy: Alexander. The [[spoiler:Luluko incident]] only deepens this trait.
* ItsNotYouItsMe: Villetta after she reunites with Graham in spades.
* KilledMidSentence: [[spoiler:Euphemia.]]
* LargeHam:
--> "Get ready for a surprise! [[spoiler:HEEEEEEEEEEEEEEEEEEEEEEEE'RE'S HALLELUJAAAAAAAAH HAAAAPTIISMMMMMMMMMMMMMMAH!"]]
* LoveHurts: Hinted at between Kallen and Lelouch when Kallen appears in the big finale. Same with Graham after reuniting with Villetta and Soran failing to protect Cornelia.
* LoveIsAWeakness: What Graham thought of love during his interactions with Villeta, but Soma makes him realise how wrong he is.
* LoveTriangle: Between Graham, Ohgi and Viletta. See above.
* MaleGaze: Neil and Allejujah Haptism (the latter with teasing of his evil side).
* MeaningfulRename: From Soran to Alexander Bismarck Waldstein.
* MoralityChain: Lelouch realizes, after geassing Hamid to reveal his motivations, how important Nunnally is to him, or else [[NotSoDifferent he would be just like him]].
* TheMourningAfter: Graham to Viletta. [[NotQuiteDead However...]]
* PlayingTheVictimCard: Nena, when she accusses Alexander of harassing her. Thanks to Mena revealing the truth, it ends fair for him.
* PretextForWar: [[spoiler:Britannia will use the European interference in Japan to wage war against them]].
* PunchClockVillain: The Knight of Rounds, by canon, but Bismarck here takes UpToEleven.
* RagsToRiches: The entire point of Soran's adoption.
* ReasonYouSuckSpeech: Hamid to Kallen, on her terrorist activities.
* ReligiousStereotype: Before the Britannian incorportation, East Krugistan was basically filled with fundamentalists, compared with Central Krugis' moderate monarchs and West Krugis' pro-democractic stance.
* TheRival: Hamid to Alexander, to the point of their confrontation in Fukuoka is almost a BigLippedAlligatorMoment.
* SecretKeeper: Lelouch knows about Alexander's past.
* SexySantaDress: Milly as usual, in the ChristmasEpisode.
* ShipTease: There is lot of indications of Shirley/Alexander.
** And it seems those indications [[RelationshipUpgrade are evolving]].
* ShootTheShaggyDog: Selim was the only one from Hamid’s team to make it alive from the Knightmare hangar in Tal Afar and then Hamid kills him without remorse.
** Luciano does this to [[spoiler:Kinue, however he gave her a dose of [[LetThemDieHappy Refrain before she died.]]]]
--> '''Luciano''': Accept this, the limit of the Vampire of Britannia's compassion."
* ShoutOut:
--> '''Hallelujah''': "[[Videogame/TeamFortress2 What's that Siegy? Kill them all? Good Idea!]]"
* ShowerOfAwkward: Alexander accidentally sees Cornelia naked and ran away, and then he accidentally stumbles upon a plan of the guys to steal panties from the girls.
* SmittenTeenageGirl: Shirley towards Alexander.
* [[SerialKillerKiller Terrorist-Killer Terrorist]]: Hamid.
* TheWikiRule: [[http://codegeassfanon.wikia.com/wiki/One_and_Only_Son Has its own wikia.]]
* ThreeAmigos: Alexander, Suzaku and Rai.
* TokenMinority: Cyrus Abdullah, ''for some reason that has to be explained yet'', is currently the only non-Britannian Knight of the Round. He still gets a lot of racism, though.
* UnderTheMistletoe: Alexander and Shirley.
* UndyingLoyalty: [[spoiler:Alexander refuses to abandon Cornelia when Lelouch requests his services and then he has to use his Geass to make him forget it.]]
* VillainousValor: Hamid displays this in the season finale, even considering that's to save his own skin, [[spoiler:charging alone at the Britannian forces to ensue their withdraw is an action that demands a lot of courage.]]
* YouCantThwartStageOne: [[spoiler:The Black Rebellion fails, but with an important difference: most of the Japanese staff managed to evacuate.]]
* WHAMEpisode: Chapter 15. [[spoiler:Euphemia dies, but in a different way than canon, and we discover that Hamid and Soran are siblings.]]
* WiseBeyondTheirYears: Nonnette believes that Princess Marina is very wise when it comes to war issues.
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