The Warumo Gang is the show's regular troublemakers that first appeared in episode 15. In the first season they plot to take over the Muglox Kingdom. In the second season they become lackeys for Darkman. In the third and fourth seasons they constantly cause trouble for Mirumoand his friends, but their tricks always fail due to their clumsiness. Their magical tools are shamisen. 

Yashichi used to be their executive apprentice, whose job was to destroy Mirumo in the human world while they were still in the fairy world, but Yashichi quit in episode 65 to protect Azumi.