Cover

A Cover is a human identity used by the Unchained. Much more than a simple human disguise, when she first Falls a demon's Cover is the remnants of the Infrastructure that supported her as an angel. A Cover is much more than a backstory and a few props, though. When she Fell, the demon interfaced with reality rather than the God-Machine and wrote her disguise into the world.

Description & Function
Demons have entirely human bodies, fully-detailed backgrounds, relationships, possessions, jobs-whatever was needed for their Cover.