Tomte or Nisse

An illustration of an angry
tomte stealing hay from a farmer.

A tomte, nisse or tomtenisse (Sweden) (Swedish pronunciation: [ˈtɔ̀mːtɛ]), nisse (Norway and Denmark) (pronounced [ˈnìsːɛ]) or tonttu (Finland) is a humanoid mythical creature of Scandinavian folklore. The tomte or nisse was believed to take care of a farmer's home and children and protect them from misfortune, in particular at night, when the housefolk were asleep. The Swedish name tomte is derived from a place of residence and area of influence: the house lot or tomt. Nisse is the common name in Norwegian, Danish and the Scanian dialect in southernmost Sweden; it is a nickname for Nils, and its usage in folklore comes from expressions such as Nisse god dräng ("Nisse good lad", cf. Robin Goodfellow). Other names are tuftekall, tomtegubbe or haugebonde ("mound farmer"), all names connecting the being to the origins of the farm (the building ground), or a burial mound. Those names are remembrances of the being's origins in an ancestral cult.


Appearance
The tomte/nisse was often imagined as a small, elderly man (size varies from a few inches to about half the height of an adult man), often with a full beard; dressed in the everyday

Succubus

In folklore traced back to medieval legend, a succubus (plural succubi) is a female demon or supernatural entity that appears in dreams, who takes the form of a human woman in order to seduce men, usually through sexual intercourse. The male counterpart is the incubus. Religious traditions hold that repeated intercourse with a succubus may result in the deterioration of health or even death.
In modern fictional representations, a succubus may or may not appear in dreams and is often depicted as a highly attractive seductress or enchantress; whereas, in the past, succubi were generally depicted as frightening and demonic.

Incubus

An incubus (nominal form constructed from the Latin verb, incubo, incubare, or "to lie upon") is a demon in male form who, according to a number of mythological and legendary traditions, lies upon sleepers, especially women, in order to have sexual intercourse with them. Its female counterpart is the succubus. An incubus may pursue sexual relations with a woman in order to father a child, as in the legend of Merlin.Religious tradition holds that repeated intercourse with an incubus or succubus may result in the deterioration of health, or even death.

Mandragora (demon)

In myth, mandragoras are familiar demons who appear in the figures of little men without beards.
Mandragoras are thought to be little dolls or figures given to sorcerers by the Devil for the purpose of being consulted by them in time of need; and it would seem as if this conception had sprung directly from that of the fetish, which is nothing else than a dwelling-place made by a shaman or medicine-man for the reception of any wandering spirit who chooses to take up his abode therein.

Stories
The 16th century Hispanic writer Martin Delrio states that one day a mandragora (mandrake), entering at the request of a sorcerer, who was being tried before a court for wizardry, was caught by the arms by the judge, who did not believe in the existence of the spirit, to co

Imp Demon

 Lincoln Imp at the
Medieval Cathedral of Lincoln, England.

An imp is a mythological being similar to a fairy or demon, frequently described in folklore and superstition. The word may perhaps derive from the term ympe, used to denote a young grafted tree.
Originating from Germanic folklore, the imp was a small lesser demon. It should also be noted that demons in Germanic legends were not necessarily always evil. Imps were often mischievous rather than evil or harmful, and in some regions they were portrayed as attendants of the gods.
Imps are often shown as small and not very attractive creatures. Their behavior is described as being wild and uncontrollable, much the same as fairies, and in some cultures they were considered the same beings, both sharing the same sense of free spirit and enjoyment of all things fun. It was later in history that people began to associate fairies with being good and imps with being malicious and evil. However, both creatures were fond of pranks and misleading people. Most of the time, the pranks were harmless fun, but some could be upsetting and harmful, such as

Gremlin

A gremlin is an imaginary creature commonly depicted as mischievous and mechanically oriented, with a specific interest in aircraft. Gremlins' mischievous natures are similar to those of English folkloric imps, while their inclination to damage or dismantle machinery is more modern.
Many people think that gremlins come from old myths, like leprechauns and pixies, but the gremlin was actually coined by the British Royal Air Force in the early 1900s. The word gremlin first appeared in print in a poem published in 1929 in the journal Aeroplane. Gremlin was used during WWII to explain the inexplicable mechanical problems that would happen while an aircraft was in flight. British author Roald Dahl, who served his military service in the Royal Air Force and was familiar with the concept of the gremlin, published a children's book that he called The Gremlins (1943). In it, he named the male gremlins widgets and the female gremlins fifinellas. In Gremlins the movie, the little furry creatures are called mogwai. 

Draugr : The Death Lord

A draugr, draug,draugur , or draugen, also known as aptrganga (literally "after-walker", or "one who walks after death") is an undead creature from Norse mythology, a subset of Germanic mythology. The original Norse meaning of the word is ghost, and older literature makes clear distinctions between sea-draug and land-draug. Draugar were believed to live in the graves of the dead, with a draugr being the animated body of the dead. As the graves of important men often contained a good amount of wealth, the draugr jealously guards his treasures, even after death.
The Old English cognate was dréag ("apparition, ghost"). The Gaelic word dréag or driug meaning "portent, meteor" is borrowed from either the Old English or the Old Norse word.

Underground Civilians: The Deros

Believers in the theory that Earth has a hollow, inhabitable core sometimes also believe in evil creatures called the Deros, which were supposedly created through genetic engineering.

Resembling demons, these creatures supposedly visit the surface of the earth to kidnap human beings, whom they then subject to a variety of tortures. They also supposedly wreak de¬struction on the inhabitants of Earth's sur¬face by using technologically advanced ma¬chines hidden in caves to alter weather, alter brain waves to cause mental illness,and case industrial,traffic,and other accidents.

The idea of the Deros originated with Richard Sharpe Shaver, who, in 1943, told the editor of the magazine Amazing Stories that he had seen these beings; their name, he said, was derived from the words detri¬mental robots, though they were not actu¬ally robots but living creatures. According to Shaver,

Banshee: woman of the sídhe

The banshee (pron.: /ˈbænʃiː/ ban-shee), from Irish: bean sí ("woman of the sídhe" or "woman of the fairy mounds") is a female spirit in Irish mythology, usually seen as an omen of death and a messenger from the Otherworld.
In legend, a banshee is a fairy woman who begins to wail if someone is about to die. In Scottish Gaelic mythology she is known as the bean sìth or bean-nighe and is seen washing the blood-stained clothes or armour of those who are about to die. Alleged sightings of banshees have been reported as recently as 1948. Similar beings are also found in Welsh, Norse and American folklore.