Spider Demon (son) (蜘く蛛も鬼おに「兄あに」 Kumo oni: Ani?) was a member of the spider family.

Older Brother Spider Demon anime 1 1 1


The Spider Son Demon’s body takes the form of a giant spider possessing a human head, its face is similar to that of the Demon Mother and Big Sister, and has the same facial features of red dots, pure white skin, and short white hair like his “younger brother” Rui, except that his eyes possess dark red, almost black sclera, with deep blue irises and pupils.


The spider demon son is sadistic and cruel. In the spider demon mother flashbacks, he openly mocks the physical and verbal abuse she suffered from Rui and the spider demon father, while sarcastically calling them “mother” and “father”, which shows that likes to play the role of ‘family’.


At one time, the Spider Demon Son became a demon and took refuge in Natagumo Mountain. When Rui arrived on the mountain, he chose the Spider Demon Son to be his big brother, having him modify his own body to fit.


Arch of Mount Natagumo

As Zenitsu Agatsuma panicked at the sight of several humans transforming into spiders, the Demon Son of Spider descended from his house, causing the terrified Demon Slayer to flee. The Demon Son warns the young man that he had already lost, telling him to watch his hand. He noticed that the Demon Slayer had been bitten by a spider and poisoned, and would become a spider himself in half an hour. Pulling out a watch, the Demon Son explained to his opponent the various effects of the poison, as well as the times they would occur. Zenitsu panicked upon hearing this, running and climbing a tree, for which the Spider Demon both berated him and questioned his decisions. He continued to tell the young man that he had nothing to fear,

As Zenitsu continued to complain, the Demon Son was bewildered, and was also confused when the youth fainted and fell from the tree. However, the Demon Slayer quickly recovered and charged at the Son Demon, who spewed acidic venom at his attacker. Zenitsu dodged this mid-air attack, then landed on the ground, while the Spider Demon contemplated this new change of circumstance. He ordered his spider minions to attack Zenitsu as the young man prepared another attack, which was dodged, prompting the Demon Son to spit venom at the Demon Slayer again. Although this was also dodged, the demon brother confirmed that Zenitsu could only use one technique, causing him to gloat over his apparent victory.

The Spider Demon continued his assault with another spit of venom, this time managing to knock Zenitsu down, while his minions tackled the weakened youth. He ordered them to Inflame the Demon Slayer, which was dodged, but he noted that the overexertion made his opponent vomit blood, causing him to call Zenitsu useless to him. However, the youth prepared to resume his attack, while a startled Demon Son noticed that the air was shaking. He retreated into his house, letting out another venom spray, but Zenitsu’s enhanced Thunder-Clap Flash technique pierced through him, slicing his neck. The Demon Son’s final moments were marked by Zenitsu’s utter disbelief, who had defeated him, and his body hit the ground in two parts.

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supernatural abilities

blood demon art

Spider Physiology : Of all the members of his “family”, the Spider Demon Son possesses the most spider traits. It literally has legs, an abdomen and a thorax that resemble those of a spider.

  • Poison Manipulation : The Demon Spider’s Son’s ability to resemble a spider is his power to generate and manipulate deadly poison.
  • Spider Transformation : The Spider Demon Son reveals that one of his venoms possesses the ability to transform a human being into a spider-like creature, whose only remaining human feature is a human head, turning them into a spider-like hybrid. human like himself, completely losing all intelligence and becoming submissive to him. The transformation process itself requires at least 30 minutes for the victim to be fully transformed. However, there are venom antidotes that can save the poisoned victim.
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fighting style



  • Poison Spit (斑ふ毒どく痰たん Fudoku tan?) – A spit venom attack, capable of dissolving whatever it touches.


Natagumo Mountain Arch

  • Zenitsu Agatsuma vs. Spider Demon (Sound)