Demons (デーモン, demon, or 悪魔, akuma) or sometimes known as Devils, show up many times in Go Nagai's works, especially in the series Devilman, Demon Lord Dante, and Devil Lady Dororon Enma-kun. They are powerful beings with unique abilities and appearances. modifyremove
Demons ruled the earth in the ancient past millions of years ago. Living off their instincts they slaughtered one another for the sake of power. God came to exterminate the race from the Earth and sent his Angels to do so. Satan felt pity for the Demons and rebelled against God to save them. After a long battle the Demons were sent into hibernation until the time came for them to rise up and defeat God in the final battle. After they awoken they find pests called humans to have conquered their Earth. Therefore Satan and the Demons declare war on the humans. In Demon Lord Dante the Demons were the first intelligent tribe of humans to establish themselves on the prehistoric Earth. Using technology they fused themselves with machinery and dinosaurs to become the Devils they are today.
According to Devilman vs Getter Robo, the demons fought Dinosaurs in the ancient past and were enemies.
Proned to violence Demons are aggressive towards all living creatures, including other Demons. This is because whenever a Demon kills another creature he merges with their body and takes over their mind. All their powers and knowledge become one with the Demon. Inanimate objects can also be used in the construction of the Demon's body, such as rocks, missiles, and guns.Humans on the other hand are harder to control because of reason. Therefore a Black Sabbath must be invoked where the humans run off on instinct, if not a Demon trying to merge with a human dies along with it's host. However if a human with a pure heart is invaded by a Demon the Demon's soul is suppressed and the human obtains the Demon's body and powers without losing himself, thus becoming Devilmen.