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Kyūso (旧鼠, old rat) is a rat yōkai.
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.
He appeared again in episode #72, Yōkai Castle Awakens!! Shu-no-Bon's Difficult War Story.
Rat Transfiguration: 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.
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|