* ActorAllusion:
** Jin-e bringing out [[Series/KamenRiderDenO a regular pocketwatch (with ominously loud ticking)]].
** [[Series/KamenRiderDenO This isn't the first time Takeru Satoh held a sword in such intensity, and played a character with multiple personalities]].
* BeamMeUpScotty: For fans who read fan fiction, it's an accepted phenomenon that Kaoru's favorite scent is Jasmine (and to a lesser extent, Kenshin is often associated with sandalwood, or something), even though the only character in the ENTIRE series to have a scent associated with them was Tomoe and her plum blossoms.
* CreatorBacklash: Watsuki has expressed regret at creating Raijuta. He's often cited as saying that Raijuta is his least favorite character.
* CrossDressingVoices:
** Twice for Kenshin in the Japanese original.
** Yahiko, like Kenshin. In the dubs, it's case by case.
** Soujirou in the original.
** Curiously averted in the Colombian Spanish dub, as all the characters are voiced by people of their respective genders, including kids.
* ExecutiveMeddling: [[WordOfGod In his original conception, Kenshin was supposed to be ''at least'' 30.]] But Nobuhiro Watsuki was told that "30 was too old for a primary protagonist in ShonenJump." So, Watsuki dropped Kenshin's age to 28. (Thus keeping the concept of a more seasoned protagonist than the typical of the {{Shounen}} genre, but also making Kenshin young enough to be "acceptable".) Lampshaded in series, when Kaoru tells Kenshin he "can't possibly be 28", and Kenshin asks "Would 30 make you happier?" and Kaoru replies that it would not.
* HeyItsThatVoice: Yutaro [[Manga/OnePiece is gonna become the Pirate King!!]]
** Since no one is mentioning it: Hiko [[Creator/ShuichiIkeda IS]] [[MemeticMutation A]] [[Anime/MobileSuitGundam CHAR]].
** As mentioned in PlayingAgainstType below, Kamatari [[JunkoTakeuchi shall be]] Manga/{{Naruto}}/[[Manga/HunterXHunter Gon]] and Soujirou [[Creator/NorikoHidaka was]] [[Manga/RanmaOneHalf Akane Tendo]].
** Creator/SteveBlum provides the English voice of Makoto Shishio.
** The English dub is actually chock full of voices that would later become notable. Names like Creator/JamiesonPrice, Creator/MichaelMcconnohie, Creator/MichelleRuff, and others all pop up.
* HeyItsThatGuy: The live-action film involved ''Series/KamenRiderDenO'' as Kenshin. [[MythologyGag Bonus in that]] Takeru Satoh, the lead, recently portrayed another historical assassin, Okada Izo, in the historical drama ''Ryomaden'' (which was apparently why he was chosen in the first place). The director of the film, Keishi Ootomo, was himself the director of ''Ryomaden'' (and, as you will see in the list below, the ''Ryomaden''-affiliated cast is beginning to become a ProductionPosse for this film series).
** More bonus points: Jin-E is played by Koji "[[Series/KamenRiderDouble Kamen Rider Skull]]" Kikkawa, [[TheDragon Gein]] by Go "[[Series/KamenRiderFaiz Aki Sawada / Spider Orphenoch]]" Ayano, and [[TheBrute Banjin]] is Genki "Luna Dopant" Sudo!
*** The sequels add another one to the list, as Chou will be played by Ryosuke Miura, known to Rider fans as [[Series/KamenRiderOOO Ankh]]. [[ActorAllusion His blondness is fabulously spot on.]]
** Furthermore, a majority of the main cast were alumni of the annual [=NHK=] Taiga Dramas (historical dramas of various periods of Japanese history), which include:
*** Emi Takei (Tokiwa Gozen from ''Taira no Kiyomori'') as Kaoru.
*** Munetaka Aoki (Tosa administrator Goto Shojiro of ''Ryomaden'' and Benkei from ''Taira no Kiyomori'') as Sanosuke.
*** Kagawa Teruyuki (Tosa ronin and future Mitsubishi founder Iwasaki Yataro of ''Ryomaden'', as well as Rokuheita from ''Komyo ga Tsuji'') [[MythologyGag as]] Kanryu.
*** Image model Yu Aoi (Nagasaki {{geisha}} Omoto of ''Ryomaden'') as Megumi.
*** Eguchi Yosuke (Sakamoto Ryoma from ''Shinsengumi!'' and OdaNobunaga in ''Gunshi Kanbei'') [[PlayingAgainstType as]] Saito.
*** The aforementioned Koji Kikkawa also counts, considering he played OdaNobunaga in ''Tenchijin'' and now Saigo Takamori in ''Yae no Sakura''.
*** Retroactively counting for appearing in ''Yae no Sakura'' are Go Ayano (Gein, playing daimyo Matsudaira Katamori of Aizu) and Eiji Okuda (General Yamagata, playing pro-Western scholar Sakuma Shozan).
** The casting announcements for the upcoming sequels have added more to this, such as:
*** First and foremost: Tatsuya Fujiwara ([[Manga/DeathNote Light Yagami]], [[Literature/BattleRoyale Shuya Nanahara]], and Okita Soji from NHK's ''Shinsengumi!'') as Shishio.
*** Ryunosuke Kamiki, known for voiceovers in ''Anime/SpiritedAway'', ''Anime/HowlsMovingCastle'' and ''Anime/SummerWars'', as well as Minamoto no Yoshitsune (both as a child and as an adult in ''Yoshitsune'' and ''Taira no Kiyomori'', respectively) shall be Soujirou.
*** Yukiyoshi Ozawa (Kiso/Minamoto no Yoshinaka from NHK's ''Yoshitsune'' and Saigo Takamori from ''Atsuhime'') shall be [[CanonForeigner Ito Hirobumi]], the first Japanese prime minister.
*** Yusuke Iseya ([[ThirteenAssassins Kiga]], [[SukiyakiWesternDjango an alternate-universe Yoshitsune]] and Takasugi Shinsaku from ''Ryomaden'') shall be Aoshi.
*** Min Tanaka (Tosa councilor Yoshida Toyo from ''Ryomaden'') as Okina.
*** Tao Tsuchiya was cast as [[PluckyGirl Misao]], and she once played the young Sakamoto Tome (the {{Tomboy}}-ish older sister of Sakamoto Ryoma in ''Ryomaden''), [[ActorAllusion so it might just fit]].
*** And it was recently revealed that Hiko Seijuro XIII will be portrayed by no other than Masaharu Fukuyama, Sakamoto Ryoma of ''Ryomaden'' himself.
* HilariousInHindsight: Watsuki-san [[WordOfGod noted in his character profiles]] that he based Kurogasa/Udo Jin-e on the historical assassin Okada Izo. Fast forward today where (as detailed above) Takeru Satoh, who played Izo in ''Ryomaden'', plays Kenshin. This comes full circle when the film incarnation of Jin-e, who was based originally on Izo, claims to be a more genuine assassin than Kenshin-as-Battousai. Trippy? You bet.
** Back in ''Series/KamenRiderDenO'', Takeru Satoh played Ryotaro, who is the nominal Franchise/KamenRider, a living anomaly referred to as a Singularity Point. How does one mark a point? '''With an X.'''
** He was known for saying [[ByThePowerofGrayskull "hen]][[HenshinHero shin"]], now he goes by Kenshin. Not hilarious but definitely silly.
* LyingCreator: Watsuki has admitted (in the sidebars titled "Watsuki is a Liar"), among other things, that "rurouni" is a word he made up.
* OneHitWonder: "Kimi ni Fureru Dake de" by Curio.
* PlayingAgainstType:
** Shishio Makoto is voiced by Masanori Ikeda, an ex-IdolSinger from TheEighties. [[http://www.youtube.com/watch?v=1Eitvlx9Ibw This is his most popular hit, "Night of Summer Side"]]. Compare Ikeda's singing [[http://www.youtube.com/watch?v=Cw85i8Iahew to Shishio's voice]] now. Huh.
** Honjou Katamari is voiced by Creator/JunkoTakeuchi. Yes, by [[{{Naruto}} Naruto Uzumaki]] and [[HunterXHunter Gon Freecs]].
** Seta Soujirou is voiced by Creator/NorikoHidaka, whose most famous role is as [[TsunDere Akane]] from ''Manga/RanmaOneHalf''.
* PortmanteauSeriesNickname: "[=RuroKen=]" for Rurouni Kenshin.
* RoleEndingMisdemeanor: Or at least a variant of it, involving associated musicians. Music/LArcEnCiel's "Fourth Avenue Cafe" was used as the fourth ending song for four episodes, but when the band's former drummer got busted for drugs, the resulting controversy caused the producers to pull the song and switch back to the third ending for another seven episodes.
* ShoutOut: Episode 45 of the anime was entitled "As If in Flight" (翔ぶが如く, Tobu ga Gotoku), which was also the title of the 1990 NHK Taiga Drama detailing the life of Saigo Takamori (an Ishin Shishi leader from Satsuma who was among the proponents of the Meiji Restoration, later to be dismissed and rebelling in the fatal 1877 Satsuma Rebellion). The long-running series theme of the agents of the Restoration being dismissed/eliminated by the Meiji government ([[IronicEcho and how Shishio is going to rub in the government's face all their crimes and actions against the Shogunate]]) was [[InvokedTrope discussed in detail]].
* WhatCouldHaveBeen:
** The author originally intended for Usui to be a Franchise/{{Terminator}}-style manhunter, pursuing Kenshin relentlessly through darkened city streets. Instead, we got [[AnticlimaxBoss the]] [[InformedAbility above]].
** Henya was originally going to be introduced as a villainous character during the Kanryu arc; also, he was originally going to be in an aerial battle with Kenshin, but Watsuki changed this because he felt Kenshin would have been too strong an opponent.
** According to Watsuki, Raijuta was originally supposed to ''be'' as imposing as he looked, but VillainDecay gradually set in.
** The manga was originally going to be much shorter than it turned out to be, revolving around the Jinchuu arc.
** It was originally going to be revealed that Hannya had been stepped on in the womb like the Film/TheElephantMan, explaining his featureless death-mask of a face. Watsuki realized the UnfortunateImplications of that idea, and altered the backstory to Hannya having intentionally mutilated his face so that he could easily disguise himself as just about anything.
** There was a pilot chapter in which Megumi (a rather weak-willed woman barely holding the family together), Kaoru (a tomboy {{Tsundere}} serving as the acting dojo-master), and Yahiko (a brat of a kid who feels like he has to be the man of the family since his father died) are siblings.
** There's also a proto-story of Kenshin meeting DamselInDistress Chizuru, who gifts him a ribbon to tie his hair back up when he loses his original ponytail tie in a fight. Chizuru lives on in cameo form at the end of the controversial second OVA, [[spoiler: as the girlfriend of Kenshin and Kaoru's son Kenji]].
** Watsuki mentioned in his notes his concept for a fourth arc of the story which would revolve around Kenji competing against Yahiko and Tsubame's son to inherit the reverse blade. Interestingly, Kenji Himura would most likely been the antagonist of the arc, from what Watsuki had stated about his concept. That, plus the fact that the story would have been set in the beginning of Japan's move towards nationalism and militarization makes one wonder what the story would have looked like…
* WordOfGod: Watsuki himself has said that the series ended the way it did specifically because it was a shonen series.
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