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He appeared in Episode #103 of the fourth anime adaptation, Monster Rat! Yōkai Kyūso.
He first appeared in the eighth episode of the fifth anime adaptation, An Old Adversary! Nurarihyon. As part of Nurarihyon's plan to defeat Kitarō, he attacks the boy with a powerful poison. Kitarō is rendered almost helpless, and is forced to retreat. Using the last of his energy, Kitarō attacks Kyūso, Nurarihyon, and Kani-Bōzu using a powerful Internal Electricity attack, letting him escape.
After Kitarō is presumed dead thanks to Dodomeki, he can be seen celebrating with Nurarihyon and his other minions at his apartment, though the celebration doesn't last long. Nurarihyon and his minions rush to stop Kitarō's chanchanko from reviving him. Kitarō's family fights back, including Ittan-Momen, who punches Kyūso. After an unsuccessful battle, Nurarihyon and his minions, including Kyūso, retreat.
He appeared again in episode #39, Nurarihyon's Last Day.
He appeared again in episode #72, Yōkai Castle Awakens!! Shu-no-Bon's Difficult War Story.
Powers and Abilities
Rat Transmutation: Kyūso is capable of turning others into rat-like beings and putting them under his control. He is able to do so by having a swarm of rats cover his victim, which then they disappear as they start growing features of a rat, such as a ears, whiskers and fur.
Poison: In the 2007 anime, Kyūso can poison his foes by biting them. The poison is so powerful, that when Kitarō was bitten, his chanchanko was the only thing keeping the poison from entering his body.
The Kyūso of legend feeds on kittens. They are weak, but learn from their natural enemy (cats) and eventually bare their fangs as their hearts become warped.
|Main||Nurarihyon (leader) • Shu-no-Bon • Jakotsu-Babaa|
|Monday Dramaland||Miage-Nyūdō • Nobiagari • Okkamuro • Amikiri • Vampire Elite|
|The Demon Flute||Sakurako • Yadōkai • Nupperabō • Kawazaru|
|1985 Anime||Chinpo • Guwagoze • Oboro-Guruma • Tsujigami • Raijū • Kowai • Oiteke-Bori • Grass Kamaitachi • Okuri-Chōchin • Ashi-Arai • Nururibō|
|1996 Anime||Momon-Jii • Backbeard • Kōmori-Neko • Grimalkin • Viy • Giant • Youaltepuztli • Ustrel • Poltergeist • Golem|
|2007 Anime||Kamaitachi • Kyūso • Kani-Bōzu • Dodomeki • Mashiro • Yōkai Castle|
|2008 film||Nure-Onna • Yasha • Satori • Te-no-Me • Gasha-Dokuro|
|2018 Anime||Neko-Sennin • Nuppeppō • Tsuchi-Korobi|