Please note that this is the Nurarihyon no Mago Wiki's article on the character, if you are looking for the article on the species then you should head to Gyūki (species).



(牛鬼, Gyūki)

  • Umewakamaru (梅若丸, Umewakamaru)

Personal Data


Gender Male Male


Astrological Sign Sagittarius December 6


Yōkai (Gyūki)

Height 185 cm
1.85 m
6.07 ft
72.835 in
Weight 83 kg
182.984 lb
Fear Type

Fear Icon Presence Presence


Nura Clan

Voice Actors





Nurarihyon no Mago Chapter #1


Nurarihyon no Mago Episode #1


Nurarihyon no Mago: Great Profuse Hyakki War


A Fierce Grand Soccer Rally - The Nura Clan W Cup

Appears in

Anime, Manga and Game


Shikigami Summoning

Gyūki (牛鬼, Gyūki) real name is Umewakamaru (梅若丸, Umewakamaru) is a high-ranked subordinate of the Nura group, and one of its board members. He is the chairman of the Gyūki Clan and the kanji for his name means "bull."

Appearance Edit

Gyuki's hair is grayish at the top and has black tips, with two wavy horizontal lines across the top. The right half of his face is covered by his long hair. A few strands of loose hair that hang on the left side of his face are usually hooked behind his left ear. He has a bit of stubble running across his jaw and chin.

He usually wears a purple colored shihakusho lined with white cloth and a green haori.

When he was younger, Gyuki (or at that time, Umewakamaru) sported a ponytail but still kept the right half of his face covered.

He is shown to be quite muscular.

Personality Edit

Gyūki is frequently described as the type who ruminates over things much like a cow ruminates its meal. He is a careful and meticulous planner, and his plans always have the Nura Clan's best interests at heart. He is generally a quiet and calm person who listens to all the facts before passing judgment, and his opinion is regarded highly. Once he reaches a conclusion, he will see it through to the end. He is greatly effected by people who acknowledge him - hence his loyalty toward Nurarihyon and the eventual change in his opinion of Rikuo.

Despite his appearance, he has performed humerous actions such as forcing down sake into the throats of other yokai while drunk during the New Years party.

History Edit

Young Umewakamaru

Young Umewakamaru

The Gyūki who is part of the Nura Clan was once a human named Umewakamaru (梅若丸, Umewakamaru) and was born into a house of nobles. At the age of seven, after his father's death, he began serving at the temple on Mt. Hiei to pray for his father's soul, and it was during this time that his mother left him there and went off on her own. Though Umewakamaru showed a great aptitude for studies and learning, his peers at the temple became jealous and injured him several times. After receiving the news about his mother's illness, his desire to see her prompted him to sneak out of the temple and begin making his way to the capital. At Ootsu, he was tricked by a pair of yōkai who claimed that his mother was ill and staying with them on Mt. Nejireme. As a result, he was eaten by the same yōkai which had devoured his mother. However, through the power of his hatred and will, he was reborn as a yōkai after his death - destroying the yōkai which had killed his mother and himself in the process. That yōkai was the previous Gyūki, and over time the yōkai who had once been Umewakamaru became known by the same name.

In the past, prior to joining Nurarihyon's Hyakki Yakō, Gyūki had built up his clan to become one of the strongest warrior factions in the yōkai world. When they battled the Nura Clan, they lost, but Nurarihyon was so impressed by Gyūki that he asked the latter to become part of his Hyakki Yakō. An undetermined amount of time later, Nurarihyon decided to attack Osaka Castle to save Yōhime - an act which Gyūki warned him would be incredibly dangerous. Even so, Gyūki was still among the invading Nura Clan who arrived as Nurarihyon's support to battle Hagoromo Kitsune's forces - where Gyūki fought against the Great Tengu of Mt. Kurama.

He was shown on several occasions to have played with Rikuo when the latter was a child.

Synopsis Edit

Gyūki Arc Edit

Along with Hitotsume Nyūdō and Sorobanbō, he masterminds the Kyūso Clan's attempt at relieving Rikuo of the title of Third. When this proves unsuccessful, he lures Rikuo and the Kiyo Cross Squad to Mt. Nejireme and there tests Rikuo to see if the latter is capable of leading the Nura Clan. Once Gyūki acknowledges this to be true, he attempts to commit an honorable suicide but is stopped by Rikuo, who thanks him for always thinking of the Nura Clan. At the subsequent Nura Clan board meeting, he is cleared of all traitorous charges thanks to Rikuo's judgment.

Shikoku Arc Edit

Gyūki frequently appears meeting with Rikuo and Mokugyo Daruma concerning the movements of the Shikoku yōkai, as well as working out countermeasures against them.

Kyōto Arc Edit

Nurarihyon requests that Gyūki travel to Kyōto following Rikuo's departure. Arriving after Tsuchigumo devastates the Nura Clan's forces, Gyūki takes Rikuo to a secluded location to recover and train. Gyūki strikes a deal with the Great Tengu of Mt. Kurama to assist in Rikuo's training, but the tengu takes matters into his own hands when he feels the training is taking too long. Gyūki is amazed when Rikuo first uses matoi against the tengu's subordinates.

Abilities Edit

Techniques Edit

  • Hallucination is a technique which show hallucination of the people defeated by the enemy who will appear one after another and makes the enemy lose his will to fight, Gyūki can also make the hallucination says what he thinks.

Relationships Edit

Quotes Edit

  • "I won't deny that the path our commander follows is that of the beast... but that's what keeps things interesting!!"

Trivia Edit

  • Despite not officially being listed as part of the "Rikuo faction," Gyūki not only has a "fear" jacket, but also persuaded (forced) Gozumaru and Mezumaru to wear the jackets as well.
  • He ranked 12th in the character popularity poll with 302 votes.