Onmyōdō (meaning "The Way of Yin and Yang") is Japanese-style [[FunctionalMagic spell-casting]]. Methods range from Yin/Yang, [[http://en.wikipedia.org/wiki/Godai the Five Elements]], [[http://en.wikipedia.org/wiki/Shikigami shikigami]], and divination to [=ofuda=] and alchemy. ''Onmyodo'' is a very eclectic blend; while it can be treated as simply ''Rule Magic'', it also has elements of ''Force Magic'' and ''Theurgy''.

Over the centuries, the various arts and practices of ''onmyodo'' gradually became absorbed into UsefulNotes/{{Shinto}} and [[UsefulNotes/{{Buddhism}} Buddhist]] tradition, and also into the disciplines of the ''Shugenja'', and other ascetic groups. Thus, in many anime and manga works, {{miko}} (shrine maidens) are shown as knowing how to summon and control ''shikigami''.

A practitioner of ''onmyodo'' is called an ''onmyoji''. Traditionally, the only ones able to legally practice ''onmyodo'' were appointed by the Imperial government, and were in fact, civil servants of the Bureau of Onmyō. During the Heian period, ''onmyōji'' had quite a bit of political clout, but when the imperial court fell into decline, their status as civil servants was lost. Their original responsibilities included keeping track of the calendar, divination, and protection of the capital from evil spirits. They also watched for auspicious and/or harmful influences in the earth, (earthquake detection).

The most famous ''onmyoji'' is Abe no Seimei, who is roughly analogous to the Merlin of [[KingArthur Arthurian legend]]. Like Merlin, it is said that he was not entirely human. Abe no Seimei is a documented historical personage who lived from about 921 CE to around 1005 CE, the middle of the [[JidaiGeki Heian Period]]. A shrine dedicated to him was built in Kyoto soon after his death, and still exists today.

'''Sub-tropes'''

:'''Gobosei (pentagram)''':In Japanese culture, this is a symbol of magical power, associated with Abe no Seimei; it is a diagram of the "[[http://en.wikipedia.org/wiki/Wu_Xing#Overcoming overcoming cycle]]" of the [[ElementalPowers five Chinese elements]] (Wu Xing).

:'''[[PaperTalisman [=Ofuda=]]]''':In modern Japanese literature, [=ofuda=] are always rectangles of paper with holy or magical symbols/spells written on them. They may be used to create a protective ward, seal a building, dispel evil influences, or even as a weapon against those of malign intent.

:'''Shikigami''':Shikigami are spirits called forth to act as servants for the summoner, similar to a {{familiar}} in Western mythology. In modern representation, a [[EyeOfNewt paper doll]] is used as a focus for the spell, if the shikigami is dispelled, the paper doll remains.

:'''KujiIn and Kuji-kiri''':[[http://en.wikipedia.org/wiki/Kuji-in The Nine Syllable Seals]] and [[http://en.wikipedia.org/wiki/Kuji-kiri the Nine Symbolic Cuts]] are also among Onmyodo techniques, though they were never unique to Onmyodo.

:'''EasternZodiac''': One of the divination means ''onmyoji'' employed. During the Heian era, ''onmyoji'' were also responsible for making calendars. [[note]]Japan used the Chinese calendar until after the opening of Japan.[[/note]] As part of that system, TheFourGods were thus also incorporated into ''onmyodo''.

:'''Feng Shui''': Another Chinese influence amalgamated into ''onmyodo''.
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!!Examples:

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[[folder:{{Anime}} and {{Manga}}]]
* In ''Doomed Megalopolis'', an anime based upon ''Literature/TeitoMonogatari'' (in Literature, below), the villain Yasunori Kato is an onmyoji. He is shown with the gobosei on his gloves and hat. His magic often involves hand signs (usually Kuji-kiri) where the gobosei serves to focus/increase his power. At the beginning of the story, Kato contends with Abe no Seimei's descendants (see literature below). Throughout the anime, many onmyodo based and related concepts are illustrated, including Shikigami, [[PaperTalisman [=Ofuda=]]], and Feng Shui.
* Lin Koujo from ''Manga/GhostHunt''.
* Sumeragi Subaru and Sakurazuka Seishirou, from CLAMP's ''Manga/TokyoBabylon'' and ''Manga/{{X1999}}''.
* In ''Manga/ShamanKing'', onmyoji are high-level shamans; most notably, series BigBad Hao Asakura is an onmyoji (and may in fact be partially inspired by Abe no Seimei).
* Abe no Yasuaki from the game and anime ''HarukanaruTokiNoNakaDe'' is an onmyoji and a disciple of Abe no Seimei.
** Yasuaki's {{expy}} Abe no Yasutsugu from ''Haruka 2'' and Kajiwara Kagetoki from ''Haruka 3'' also use onmyodo, though Kagetoki ditches the more traditional MagicalGesture methods in favour of a gun-like thing that produces InstantRunes.
* Ken Akamatsu's ''Manga/MahouSenseiNegima'' features onmyoji as well as Western mages.
* The protagonist of Gainax's ''Anime/AbenobashiMahouShoutengai'' is drawn to a parallel world where he learns the the art of onmyodo from Abe no Seimei.
** Not to mention the events of the anime only happened because [[spoiler:Abe no Seimei tried to save his best friend and love interest after they both died due to a love triangle. He remade the world into our world, but when he realized events were about to repeat, he just left, presumably returning to his own world]]
* The anime and manga ''OnmyouTaisenki'' revolves almost completely around onmyodo.
* ''AskDrRin'' features an onmyoji named Tokiwa Takashi.
* Abe no Seimei himself shows up in ''New GetterRobo'' as an antagonist of the Getter Team in the latter half of the series. [[spoiler: Apparently, in a straight up battle, Onmyodo > Getter Rays]].
* ''YamiNoMatsuei'' involves a considerable amount of onmyodo-style magic, including extensive use of shikigami and o-fuda.
* Sakura Yamazaki from ''BlueSeed'' is an onmyoji (translated to "faith healer" in the English subs).
* ''OtogiZoshi'' includes a lot of onmyodo complete with Abe no Seimei.
* Isumi of ''Manga/HayateTheCombatButler'' can do nearly anything related to exorcism via this method.
** [[spoiler: Isumi also enchanted Tama via this method to enable him to become a TalkingAnimal.]]
* Nakahito in ''SteelAngelKurumi'' is an aspiring onmyoji, hoping to one day be as good as his older brother. His latent power is given as the reason for his being able to activate Kurumi in the first episode.
* ''Manga/ShonenOnmyouji'' is about the teenage grandson of ''Abe no Seimei'' (see above) and his struggles to become an onmyoji.
* Parodied on ''Manga/KeroroGunsou'' when HighlyVisibleNinja Koyuki [[NewPowersAsThePlotDemands is suddenly able to use onmyodo]] to unseal a cursed dungeon. She's not very good at it, though, and by the end of the episode, all of the Keronians have gotten accidentally possessed.
* Yamigumo Nami of ''SilentMobius'' uses Onmyodo as her form of fighting magic as a {{Miko}}.
* [[HenshinHero Rei Hino/Sailor Mars]] from ''Franchise/SailorMoon'' can use this whether transformed or not, and in particular chooses {{ofuda}} to expel demons with "Evil spirits, disperse!" ''("Akuryo Taisan!")''
* The {{Kekkaishi}} have shades of this; they have [=Ofuda=] which they use to summon Shikigami, when they need to do things such as clean up the mess they make when they fight to sustain the {{Masquerade}}.
* [[spoiler:Tsuchimikado Motoharu]] of ''ToAruMajutsuNoIndex'' is a highly-skilled onmyoji, and is even descended from a famous clan of them. However, having undergone the Power Development Curriculum, using these abilities causes a backlash in his body, and is potentially fatal for him. Luckily, his ability, Level 0 Auto-Rebirth, allows him to bypass this for a limited number of times.
* Keikain Yura of ''Manga/NurarihyonNoMago'' come from a onmyouji family specialising in shikigami and hunting youkai.
* [[spoiler:Abe no Seimei himself]] and [=ofuda=] magic (used by the Octobrist Organisation) also appear in ''Manga/{{Drifters}}''.
* It's a very large part of ''Manga/InuYasha,'' as pretty much the main form - if not only form - of magic used by humans. Even BigBad Naraku sends doppelgangers of himself pretty much by the Shikigami method (if you actually manage to beat him, you'll probably be left with a small wooden doll around which the doppelganger was built.)
* This is the form of magic used by Nanami, and by most supernaturally empowered human characters we see, in ''Manga/KamisamaKiss.'' Nanami tends to get very creative with her tailsmans, even using one concerning ''traffic safety'' to kill a a couple of demonic thugs.
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[[folder:{{Film}}]]
* The films ''Tokyo: The Last Megalopolis'' and ''Tokyo: The Last War'' are adaptations of the novel ''Teito Monogatari'' (see Literature below).
* The films ''Film/{{Onmyoji}}'' (I & II) are a fictitious account of Abe no Seimei based on the novel series of the same name (which also inspired a manga adaptation, also of the same name).
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[[folder:{{Literature}}]]
* In the 1985 bestselling novel ''Literature/TeitoMonogatari'' written by occult specialist Hiroshi Aramata, the protagonist Yasunori Kato is a master onmyoji. The first part of the novel revolves around a battle between his forces and the Tsuchimikado Family. The Tsuchimikado Family is descended from the clan of Abe no Seimei and its leader, Yasumasa Hirai, is the direct descendant of Seimei. Yasunori Kato also claims to be a descendant of Abe no Seimei (his first name, Yasunori, is derived from Seimei's teacher, Kamo no Yasunori) but is branded a heretic and a demon for going against the Japanese Empire. The bestselling, award winning occult novel is widely considered the first modern fantasy work to ignite popular interest in onmyodo mysticism in the Japanese media.
* Baku Yumemakura's ''Onmyoji'' novels, first published in 1988 (in the wake of ''Teito Monogatari'''s success), brought the popularity of onmyoji to new heights.
* Natsuhiko Kyogoku's ''Kyogokudo'' mystery novels, which started being being published in 1994, are also major contributors to the boom. The protagonist of the series, Chuzenji Kyogokudo, is a bookstore owner who functions on the side as a part time onmyoji. The first volume of the series was translated in English as ''The Summer of Ubume''.
* ''ShonenOnmyouji'' chronicles the life of Abe no Seimei's youngest grandson and his journey in becoming an onmyouji. There is also an anime adaptation.
* The villain in the [[ComicBook/TheSandman Sandman]] story ''The Dream Hunters'' is an onmyoji.
* ''LightNovel/TokyoRavens'' is set in a world where [[UrbanFantasy Japan reactivated the Onmyo Bureau back in World War 2]], with the entire cast being onmyoji, [[{{Familiar}} shikigami]] or both. Apart from featuring just about every traditional depiction of onmyodo, {{Magitek}} is available such as mass-produced {{Ofuda}}, robotic shikigami, and even [[AbnormalAmmo ofuda missile pods]].
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[[folder:VideoGames]]
* Abe no Seimei [[GenderFlip herself (!)]] appears, mystical powers intact, as a playable character in ''[[VideoGame/OtogiMythOfDemons Otogi 2: Immortal Warriors]]''. Cue pentagrams and shikigami.
* Keiya Tenpouin from the ''VideoGame/EvilZone''.
* ''VideoGame/FinalFantasyTactics'' includes a Job called Onmyoji (translated as "Oracle" for the English release of the game).
* Player character Sayo-chan / Pocky from the ''VideoGame/KikiKaiKai'' / ''Pocky & Rocky'' series uses ''[=ofuda=]'' as ranged weapons.
* Akari Ichijo from ''VideoGame/TheLastBlade'' is a BunnyEarsLawyer example, who uses her [[ZigzagPaperTassel gohei]] as a weapon, can summon a variety of youkai to attack her opponent and uses her shikigami basically to cheat death (whenever she's hit with a finisher, she replaces herself with it). For bonus points, the home port of the first game has also an alternate version of Akari which is actually a tanuki impersonating her.
* Gensokyo is the ClapYourHandsIfYouBelieve mystical setting of the ''VideoGame/{{Touhou}}'' series, where many forms of magic co-exist. The {{miko}} Hakurei Reimu and Kochiya Sanae use [=ofuda=] and there are some on Fujiwara no Mokou's pants, probably as flame retardant; Reimu also has her smiting Hakurei Ying-Yang Orbs. Rumia is a {{Youkai}} with a sealing [=ofuda=] in her hair which she can't touch. Patchouli Knowledge prominently uses elemental magic based on Eastern elements (wood, metal, etc.). Yakumo Yukari has a kitsune shikigami named Ran; Ran has her own nekomata shikigami in the form of Chen.
** Many of Sanae's spellcards are also based off of onmyodo, most notably her pentagram-filled cards in ''Mountain of Faith'' and her "Nine Syllable Stabs" card in ''Subterranean Animism''.
** The {{Tanuki}}-woman, Mamizou Futatsuiwa, has a huge number of spells involving paper doll shikigami. They come in human-shaped, dog-shaped, bird-shaped, and frog-shaped varieties. She uses them as bullets, as familiars that shoot bullets themselves, or as both at once. She also has an attack where she summons copies of herself, presumably more shikigami familiiars.
* Several characters, including Abe no Seimei, [[GenderFlip her]] rival Ashiga Doman and his disciples from ''{{Kuon}}'' are identified as onmyouji and can use various kinds of magic.
* Some of this makes appearances in ''{{Okami}}''; notably, ''[=ofuda=]'' "prayer slips" are used by Rao in the Ghost Ship to dispel powerful curses and destroy ghosts.
* Chinnen's stage in ''VideoGame/PowerInstinct Matrimelee'' has onmyoji Yabeno Hikomaro, shrine maiden Kotohime, and three backup monks (referred to only as the Bouzu Dancers) dancing in the background to a surprisingly catchy tune. The song, and [[http://www.youtube.com/watch?v=PumFnlu9EIY the unlockable music video for it]], became something of a meme.
* Kanetsugu Naoe uses onmyodo in ''SamuraiWarriors''. His [[PaperTalisman [=Ofuda=]]] shoot FrickinLaserBeams.
* Onmyodo is the magic system in GirlsLove VisualNovel ''AkaiIto'' and its sequel ''AoiShiro''. Pretty much anyone capable of supernatural feat use Onmyodo to some degree, but Sakuya tops everyone by [[DidYouJustPunchOutCthulhu using it to kill an evil god]].
* Onmyodo, amongst other magic systems, consistently appears throughout ''Franchise/ShinMegamiTensei'' franchise. It's usually in the form of the OneHitKill HolyHandGrenade Hama spell. Notable users include Abe no Seimei (a descendant with the same name) in ''Raidou Kuzunoha Vs. The Lonely Marebito'' and Raidou himself to an extent.
* The Kanna class in ''VideoGame/MapleStory'' identifies herself as an onmyoji.
* In the first ''VideoGame/FatalFrame'', talismans can often be founding sealing doors. Getting rid of them requires going to a certain place and photographing a spirit, causing the talisman to burn and the door to be unlocked. A similar mechanic is found with voodoo dolls in the third game. (The second game just went ahead and had invisible "ghostly power" sealing the doors.)
* In ''VideoGame/Disgaea4APromiseUnforgotten'', Onmyo Monk is an unlockable class.
* Onmyoji appear as recruitable leaders of Jomon (a FantasyCounterpartCulture for Japan) in the ''VideoGame/{{Dominions}}'' series. They are typically strong in Astral magic and always appear with one summoned shikigami in battle.
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