Yōkai

Yōkai are very powerful supernatural species who are often confused for demons. Yōkai are born from powerful emotions towards a certain creature, idea, or even an object. This causes the creature to have physical, magical traits, and sometimes even personality traits that are often associated with that creature or idea and the emotions that created it.

Ayakashi
Ayakashi, is the name given to Yōkai who were born from emotions toward a certain animal or object. They are identified by their animal features or in the case of an object: physical attributes associated with that object. Unlike Mononoke who are very intelligent and viewed as tricksters, Ayakashi are recognized by their overwhelming physical and magical abilities.

Magical Abilities
Shinobi's belief that magic power comes from within was inspired by the Ayakashi, who's magic power isn't created by Ethernano, but rather is produced from within without any help from the Ethernano in the atmosphere. When Yōkai are low on magic power they do the same thing humans do when they are low on stamina: they eat and sleep.

Mononoke
Mononoke is the name given to Yōkai who were born from the emotions towards an idea or concept. These Yōkai are very intelligent and love to interfere with human affairs. The evil ones act more like tricksters who love to see humans annoyed or upset while the good ones act more like a personification of luck.