Takeshi Onimaru

From Detective Conan Wiki
Revision as of 03:32, 25 August 2025 by Time Lord Enthusiast (talk | contribs) (Conan vs Kid vs Yaiba - The Decisive Battle Over the Treasured Sword! (Ova: 1): Renaming OVA 1)
Takeshi Onimaru

Takeshi Onimaru Profile.png

Profile
Japanese name: 鬼丸 猛
(Onimaru Takeshi)
Age: unknown
Gender: Male
Relatives: Grandpa Onimaru (grandfather)
Ayame Onimaru (sister)
Occupation: Kendo player
High school student
Statistics
First appearance: Manga: File 990
Anime: OVA 1
Appearances: Chapters: 23
Episodes: 47
Episodes: 20
Chapters: 1
Chapters: 4
Episodes: 2
Movies: 1
OVAs: 2
Openings: 2
Closings: 2
Keyhole number: Volume 93
Actors
Japanese voice: Ryo Horikawa (Kenyuu Densetsu Yaiba; OVA 1)
Kenjiro Tsuda (Episode 917 and Movie 27)
Yoshimasa Hosoya (Shin Samurai-den Yaiba)

Takeshi Onimaru (鬼丸 猛 Onimaru Takeshi?) is the main antagonist in Gosho Aoyama's second series Yaiba and a character that was made canon in Detective Conan manga and anime.

Yaiba

Originally a very serious person, Onimaru could not get along with Yaiba at all and the two quickly became rivals. In order to defeat his hated enemy, Onimaru began training with his family's sacred sword, the Fuujin-ken, until he was possessed by it and turned into an actual demon (the character for oni in his name means demon). He soon took over all of Japan, traveling in a flying castle. His minions include Kumo-Otoko and the Hakki, the Kuroki, the Shiteno, and many completely black oni. Eventually, he switches from the Fuujin-ken to the Maou-ken.

After Yaiba cuts off his horns, he returns to being a normal human. At first he viewed Yaiba as a nuisance, but after training with Yaiba's father Kenjuro, he returns for the final story and now acknowledges Yaiba as a friendly rival. During the Oda Nobunaga Tournament, he has a dove as a pet.

Appearance

Onimaru is a tall man with a bald head, a serious expression, and a thin body frame. After turning into an Oni, he's become bulkier and taller, with a much more muscular body and small horns protruding from his forehead. As a student, he wore the typical black uniform. In his demon form, Onimaru dons a fearsome elaborate armor with the breastplate shaped like a grinning skull, spiked shoulder pads and decorated greaves and bracers trimmed with black fur. He also wears a red cloak and occasionally a black helmet shaped like a dragon's head. He also has a jetpack in the back of the armor. During the Oda Nobunaga tournament he wears a black kimono. He also has a weird dot in the middle of his forehead.

Personality

When he was possessed by the Fuujin-ken, Onimaru turned into an Oni and wanted to take over Japan, and eventually, the world. He became cruel and wanted to kill Yaiba and his friends. However, when Kaguya came to take over Earth, he and Yaiba teamed up to stop her. After Kaguya was defeated, Onimaru said he still planned to beat Yaiba and left. In their final battle, when Yaiba cut off his horns, he returned to his old self and saw Yaiba as a good rival. After that, Yaiba's father, Kenjuro, taught Onimaru kendo.

In Detective Conan, he appears more polite than in Yaiba. He apologized to Ran for bumping into his armor, though he didn't help her get up. He also talked politely with coach and even laughed a little.

Abilities

Before being possessed by the Fuujin-ken, Onimaru was skilled in kendo. In the manga, he was able to defeat the captain of the kendo club with one strike. After he was possessed, he used magical wind powers to fight and later the Demon King Sword. After Yaiba cut off his horns, Onimaru returned to his original self, and Yaiba's father taught him kendo.

Appellations

Detective Conan

Pro Soccer Player Case (Manga: 70, Anime: 10)

The game Conan plays during his investigation is called Onimaru Quest (鬼丸 QUEST ?).

Conan vs Kid vs Yaiba - The Decisive Battle Over the Treasured Sword! (OVA 1)

Onimaru has his oni minions shoot Yaiba and Kaitou Kid with a cannon during their mid-air battle.

Kendo Tournament Murder Case (Manga: 990-993, Anime: 916-917)

Ran and Onimaru.

In contrast to his prior demonic characterization, in the manga canon Takeshi Onimaru appears as an honorable, polite, and serious young man, albeit frightfully massive and skilled at kendo. He apologizes to Ran when she runs headlong into his hard chest protector and winds up on the floor. He does not help her up though, and seems more concerned with refusing an honorary citizenship, which Momiji set up for him so he would leave the tournament so Heiji could win, he feels he does not deserve due to his perceived lack of worthiness. Overall, his character appears to more purely embody a Makoto-type samurai mentality who likes fighting strong opponents. As he discusses the citizenship with the manager, he seems polite and even gives a small laugh as both leave the hall.

The Million-dollar Pentagram (Movie: 27)

Swords and techniques

  • Fuujin-ken (風神剣 Wind God Sword?)
  • Maou-ken (魔王剣 Demon King Sword?)

Trivia

  • His surname means Demon Purity and his first name means terror or shock which gives him a more terrible and dark look.

Different looks

Detective Conan (episode 10).
Detective Conan (OVA 1).
Detective Conan (episode 917).

See also

Supporting Characters
Family & friends Fusae CampbellMidori MegureShiro SuzukiAyako SuzukiTomoko SuzukiRuri UjoMisae YamamuraKazumi TsukamotoAsami TsuburayaGenji KojimaCoeurHiroshi YagisawaTamanosuke ItoMegumi ItoRenge KataokaAnnoSayo OhashiMidori KuriyamaMaroKatsumasa OguraTaiiGoroLupinMrs. TsuburayaMrs. SatoIsokichi KamoiYuzo TomizawaHina WadaYujiro TamakiIchiro TamakiMichiko YoshikawaMina KatsumataShinobu OoeSakura Toyama
Law enforcement Officer TomeInspector MomoseFemale forensics memberMasayoshi SatoOfficer NumataTsujimuraReiko KujoSasaki
Schools Ryujiro UematsuMaria HigashioTakuma SakamotoChiharu MatsubaraYumi SekizawaNatsuko ShibuyaToya
Media Naomichi MugikuraKoji YatsukawaMikihiko KamisuwaKaoru KodaMiyuki Tabeta
Case aquaintances Tohei BenzakiTeiji MoriyaNarumi AsaiRay CurtisKyosuke HagaNatsuki KoshimizuJunya TokitsuMinerva GlassReiko Akiba
Others Soshi OkitaSamizu KichiemonHikaru YasumotoChikara KatsumataTakeshi OnimaruShimogasa TwinsSatoru MaedaOsamu KenzakiHiroki OiKeita KanekoGenki IshikawaGomeraDetective SamonjiNight Baron
Related lists List of minor recurring anime charactersList of minor recurring manga charactersList of notable movie charactersList of notable case characters
Yaiba
Main Characters Yaiba KuroganeSayaka MineMusashi MiyamotoTakeshi OnimaruKojiro SasakiJubei YagyuShonosukeKagetoraGerozaemon GerodaNamako-OtokoKaguya
Secondary Characters Kenjuro KuroganeRaizo MineShizuka MineFuji MineNadeshiko YamatoMoroha KuroganeMichiko KuroganeSoshi OkitaKumo-OtokoList of minor Yaiba characters
Manga Yaiba Manga Volume 1-1011-2021-24Other volume formats
OVA adaptations Yaiba (pilot OVA)Conan vs. Kid vs. Yaiba - The Grand Battle for the Treasure Sword!!
Kenyuu Densetsu Yaiba List of episodesStaff
Yaiba: Samurai Legend List of episodesStaff
Games Kenyuu Densetsu Yaiba (Super Famicom)Kenyuu Densetsu Yaiba (Game Boy)Kenyuu Densetsu Yaiba (Sega Game Gear)List of games
Crossovers The Kendo Tournament of Love and MysteryThe Scarlet School TripList of crossovers
Related Articles Swords used in YaibaYaoyaEkoda High SchoolPlay It AgainK∀ITOEnglish Yaiba Manga