Every religion, ancient or contemporary, believes in the existence of spiritual creatures and powers whose existence can’t be proven with logic or science. The spirits are either good and serve God’s will (angels in Western culture) or are evil and corrupt, deceive, and hurt humans in the service of their leader’s (Satan) devious plan and purpose.
From ancient Greece, Persia, Israel and Egypt to medieval Europe and Japan there have been many tales told by people who have claimed to have encountered demons. However, despite the fact that none of these stories can be proven, the blind faith and superstitions passed from generation to generation will make most of us keep the lights on at night.
Daevas were some of the most notorious demons and the personifications of every imaginable evil in Persian mythology and Zoroastrian religion. The word daeva in the Avestan language means spirit and was used to describe a demon that would do anything to bring chaos, destruction, and disorder.
The resemblance between the ultimate spirit of evil (Satan) and Krampus is more than obvious: both have a red-skinned complexion, both have horns, both have a tail, and both are said to hold a trident and chains, but despite all these details, Krampus is nothing more than the anti-Santa.
Krampus, whose name is derived from the German word krampen, meaning claw, is a popular Christmas spirit in Germanic and Nordic tribes and is not really all that bad (other than the fact that he scares the hell out of whoever sees him, especially children who have been naughty during the year and won’t be visited by Santa).
Mephistopheles appeared for the first time in literature as the demon in the Faust legend and slowly managed to climb up the demonic ladder and become a full-time theological demon. Mephistopheles appears in Doctor Faustus and other tales as a devil and loyal worker of Satan whose mission is to collect the souls of those who are already doomed and corrupt.
He is said to have a human body, long nails like a witch, the frightening face of a monster, and wings like an angel. Not a good-looking guy any way you look at it.
According to Slavic folklore, a Rusalka is something between an evil demon and a water nymph that only comes in a female form. It is believed that they live at the bottom of rivers (or lakes in rare cases) which is why some people falsely considered them to be mermaids. Rusalkas, however, are not mermaids but the spirits of dead women, usually of ones who have committed suicide over an unsuccessful love affair and are now after the whole of mankind seeking revenge.
For that reason, they come out during the night and sing with beautiful and deceptive voices paired with entrancing and seductive dancing in order to seduce men to their watery grave.
According to The Lesser Key of Solomon and later adopted by Christianity, Ziminiar is supposed to be one of the four principal kings (Amaymon, Corson, and Gaap are the other three) who has the power of seventy-two demons and was supposed to be controlled by King Solomon even though we doubt such a demon could ever be handled by any human.