I don't know much about demons, if demons exist at all..
Spirits/spirits could cause imaginings both dark and/or light.. to a human or each other..
The Spiritual Dimension could be and probably is more real this/these dimensions..
Little creepy spiritual beings I don't know about..
My sense is humans are(would be) more creepy to spiritual beings than they are to us..
Could be we know they are real "BY" imaginings.. both corrupt and perverse and high and utopian..
The Bible is a book of imaginings.. Jesus metaphors/parables are imaginings in essence..
Its possible demons are creatures and not the imaginings themselves.. I don't care either way.. To me its the imaginings I see.. and deal with.. both good and bad..
Good question actually..
My two cents...