Takeshi Onimaru

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Takeshi Onimaru

Takeshi Onimaru profile.jpg

Japanese name: 鬼丸 猛
(Onimaru Takeshi)
Age: unknown
Gender: Male
Date of birth: unknown
Relatives: Kumo-Otoko, Hakki, Kuroki and Shiteno (minions)
Occupation: Kendo player
High school student
First appearance: Manga: File 990
Anime: OVA 1
Appearances: Chapters: 0
Chapters: 5
Episodes: 2
OVAs: 1
Keyhole number: Volume 93
Japanese voice: Ryo Horikawa (OVA 1)
 Kenjiro Tsuda (episode 917)

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.


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 Fuujin-ken until he became possessed by it and became 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 for a pet.


Onimaru is a tall man with a bald head and a serious expression, with a thin body frame. After turning into a Oni, he's become bulkier and taller, with a much more muscled body and small horns protunding from his forehead. As a student, he wore the typical black uniform. In his demon form, Onimaru dons a fearsome elaborated armor with the breastplate shaped like a grinning skull, spiked shoulderpads and decorated greaves and bracers trimmed with black fur. He also wears a red cloak and occasionaly 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 on the middle of his forehead.


Detective Conan[edit]

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

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)[edit]

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)[edit]

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 a 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 push a little laugh has both leave the hall.

Swords and techniques[edit]

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


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

Different looks[edit]

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

See also[edit]

Minor Characters
Family & Friends Fusae CampbellMidori MegureAyako SuzukiMisae YamamuraKazumi TsukamotoAsami TsuburayaGenji KojimaCoeurHiroshi YagisawaManami YagisawaTamanosuke ItoMegumi ItoRenge KataokaSayo OhashiMidori KuriyamaChipmunkKatsumasa OguraTaiiGoroLupin (dog)Mrs. TsuburayaMrs. SatoIsokichi KamoiYuzo TomizawaHina WadaYujiro TamakiIchiro TamakiMichiko Yoshikawa
Tokyo Metropolitan Police District Officer TomeJinpei MatsudaWataru DateInspector MomoseMiss TomeParamedic SakaiMasayoshi SatoOfficer NumataTsujimura
Schools Ryujiro UematsuMaria HigashioChiharu MatsubaraNatsuko ShibuyaToya
Others Soshi OkitaSamizu KichiemonHikaru YasumotoChikara KatsumataWaitressTakeshi OnimaruSodesakiSatoru Maeda
Tokyo Supreme Court Reiko KujoSasakiPresiding judge
Medias Naomichi MugikuraKoji YatsukawaMikihiko KamisuwaShimizuKaoru KodaMiyuki TabetaYumi Hikita
Case Aquaintances Tohei BenzakiSeiji AsohKyosuke HagaNatsuki KoshimizuJunya TokitsuMinerva GlassReiko AkibaRokumichi Hado
Hospital Kazumi NakayamaKeiko Okita
Related Lists List of minor recurring anime charactersList of minor recurring manga charactersList of minor recurring movie charactersList of notable case characters