Mage-Nyuudou
Mage-Nyuudou is a mountain youkai who shows up regularly as one of Kitarou's main rivals. He first debuted in a Shounen Magazine story bearing his name, and since then has become a recurring headache for the protagonist across various adaptations.
What he's best known for is running Youkai School, an institution dedicated to transforming ordinary humans into youkai. It's a pretty twisted setup—basically corruption as an educational service. Most versions of the character feature this school as his main operation, making him less of a straightforward monster and more of a corruptor with institutional backing.
Content compiled by AnimeList.moe from publicly available sources.
