Abaddon - Wikipedia
an angel of the abyss and, in some occult circles, 'he' takes the form of a demonic locust. there was a kid who was possessed and in jail for strangling a grown-ass man nearly to death and they had to call priests to do an exorcism on him. this was a 12 year old boy and he bit some fingers off one of the priests. but anyways, demons are not like literal beings like popular culture says, little devils running around. i believe them to be more along the lines of energy, negative vibrations, which disrupts and corrupts people, and driving them further from where they're supposed to be, which is in the presence of god. you notice that many people do things bc of 'emotion' or how things feel. too much of feelings is gluttony, which is a sin as the bible says. so a demon would be an energy that corrupts you toward that sin, for example. i don't know if i'm making sense, but that's how i've interpreted it.