Otherkin. That is, there are many that identify as demons. That could be either a psychological identity or a spiritual one, where they feel their soul was (or still is) a demon of some kind. And then there's the origin of the word, demon:
demon (n.)
c. 1200, from Latin
daemon "spirit," from Greek
daimon "deity, divine power; lesser god; guiding spirit, tutelary deity" (sometimes including souls of the dead); "one's genius, lot, or fortune;" from PIE
*dai-mon- "divider, provider" (of fortunes or destinies), from root
*da- "to divide" (see
tide (n.)).
Used (with
daimonion) in Christian Greek translations and Vulgate for "god of the heathen" and "unclean spirit." Jewish authors earlier had employed the Greek word in this sense, using it to render
shedim "lords, idols" in the Septuagint, and Matt. viii:31 has
daimones, translated as
deofol in Old English,
feend or
deuil in Middle English. Another Old English word for this was
hellcniht, literally "hell-knight."
The original mythological sense is sometimes written
daemon for purposes of distinction. The
Demon of Socrates was a
daimonion, a "divine principle or inward oracle." His accusers, and later the Church Fathers, however, represented this otherwise. The
Demon Star (1895) is
Algol.
According to
The Encyclopedia of Spirits (by Judika Illes)
Daimones is a corruption of Theoi Nomioi, meaning "Spirits of the Countryside" or Sacred Beings of the Countryside." They are wild, rustic spirits, inhabitants of forests, mountains, and uncultivated fields. These spirits form entourages for Artemis, Dionysus, Hermes, Pan, and Kybele.
The word daimone or daemon means different things in different places and contexts. In ancient Italy, it referred to one's personal presiding spirit, a sort of guardian angel. This is the meaning from which the animal-daemons of author Philip Pullman's His Dark Materials trilogy derive. In esoteric circles of the early Common Era, daimone was synonymous with angel.
The drink; they dance; they play flutes and percussion instruments. They are spirits of ecstasy, intoxication, and sex. They are not malicious and may find it fun to scare mortals just to see them panic, run, and scream. They may be spirits of temptation, offering pleasures of sex, intoxication, and nature. They don't want your soul; they just want company and fun.
They are gregarious spirits who travel in fluid packs or gangs. They are happy to expand their circle of acquaintances, providing that you are fun and do not try to exploit them. They may be drunken and rustic, but they're sharp-witted with a good eye for true inner character. Many can be benevolent and generous, if so inclined. They are spirits of prophecy and can reveal secrets of the past and future. They can locate who or what is missing. They are not tame spirit and will not live happily indoors, at least not for long. Relationships with them may need to be maintained on their turf. Post-Christianity, this unruly, wild bunch was reclassified as "demons."
(The author also has an entry on demon but it's several pages long. I used daimones because it's the original word to demon, which I regard as more important overall.)
(They sound like they'd love The Lounge!

)
Those otherkin that identify as demons are often apologetic about their identity, that their human life isn't like their identity at all (I may have to show some of them this excerpt.) Personally, I still don't understand the psychological means of otherkin identity, whereas the spiritual kind is easy to figure out, especially if you believe in reincarnation.