Demon ninja

While most ninja were human, some demons were able to master the  art as well, and their techniques, powered by yōki were far more formidable than a normal ninja. Their leader, and the most powerful demon ninja of all, was Hoshiyomi. All four members were sucked by Miroku's Kazaana.

Notable demon ninjas

 * Hoshiyomi †
 * Genbu †
 * Suzaku †
 * Byakko †
 * Seiryū †

Trivia

 * The ninjas who served under Hoshiyomi are named after the in Chinese mythology that guard the four cardinal directions on the compass. There's also another group called the Shitōshin who follow the same trope. Also, the same four names are used for The Saint Beasts, who were villains in the first season of the anime Yu Yu Hakusho.

Ninjayōkai Ninja Demonios 妖忍众