Demon

Demons are a series of supernatural being that process ranges of power. Demons are know to give off an energy field or aura called Demon Energy. Demon monsters ranges from a simplistic monsters like the umbrella to those powerful Shinso Vampires. Demon monsters have an ability to switch between their monster form and a Human form to hide from the Human population. Demon monsters live in a dimensional realm known as the Monster World, presiding in the Demon Realm.

Trivia

 * Monster is the term any of the demonic beings were slandered with following one too many offenses by humans, hence their disguises and their general loathing of human in general.