Inconspicuous demons are just that: hard to perceive. One of their abilities
is almost always Cloak. They may merely be small, hiding in their master’s
pockets, or they may be composed of something like shadows or mist or
sunlight, or they may actually have powers of invisibility.

Object demons are invested into physical items and usually must be carried
around. They can act and move, but in that behind-your-back way that all
inanimate objects seem to have once in a while.

Parasite demons must live inside a host, usually the summoner and/or binder
but not necessarily. They may be actual critters nestled into some body cavity,
or they may exist only as an agent in the bloodstream or nervous system.

Passing demons look almost perfectly human or animal, and they mix
directly into society.

Possessor demons share a body with someone else; usually either completely killing off the original host's spirit, or leaving them a barely present flicker of consciousness.