Devil

Devil is the contraction for "Digital Devil", used by Aya Nishitani to refer to the demons in his trilogy novel Digital Devil Story: Megami Tensei.
In Japan, the reference to the demons in the games is made more explicit whereby:
*悪魔 (akuma) encompasses every incarnation of the demon enemies, and 
*仲魔 (nakama) encompassing all demons that have joined the protagonist's side.
Devil may also refer to:
*In Persona games, the Devil Arcana.
*The race from Shin Megami Tensei: Nocturne.
*The item, the Devil Fruit.