They have/can take on may forms, I have seen them as appearing as human (males/females and babies), animals, a pig faces little imp, shadow creatures, and disfigured spirits.
This is a link to a video testimony that is a very accurate representation of the spirits and Holy Angels IMHO. Bishop Kelly’s physical life is nothing like mine, but his spiritual life is a pretty good match for what I experienced.
http://www.freecdtracts.com/testimony/bishop_earthquake_kelley.htm
This video I first saw after I saw the demons and one Holy Angel. What I saw was so very close to what is represented in the video. The demons are the disfigured spirits, the ones I saw were just a bit ‘greener’ in color, but other then that matched exactly. The holy angel was also pretty much a exact match.
They do have names, they tried to get me to go deeper into the occult, which lead to astral projection, I stopped at using it to a/effect other people, actually I believe God prevented me, as I remember I was about to touch a person I knew and I just stopped and knew I should not. I don’t know what would have happened if I did.
This is SOP for them even when you don’t see them, they get you to do something wrong, then once they get a hook in you they try to get you to expand that till you are hurting yourself and/or others. Very evident in drug use, but it applies for all their things, even the worship of money.