Films: Elves (1989)
Location: Forest/Civilized area
Height/Weight: That of an average human.
Summary: Yes, Hitler actually thought that the "master race" would be composed primarily of diminutive, sickening, blood-crazed monsters based on Santa's little helpers. Hey, we don't make the rules around here. That's just how it is.
History: Back when the Nazis were a thing, they often participated in secret rituals to summon demonic creatures known as "Elves", deeming them the truth to a master race dominating the world. But now they're all gone...at least, until the last pure-blood Aryan accidentally summoned one. Now, it seeks to reproduce with her so that the Elves may rise again.
Notable Kills: The Elf goes for the typical "electronic in a bathtub" trick.
Final Fate: Eventually, the Elf's target uses an "Elfstone" to explosively banish the beast back to Hell. It's left ambiguous if the Elf actually succeeded in impregnating her.
Weakness: The Elfstone is the only thing capable of banishing the Elf for good.
Scariness Factor: 3.5-Admittingly violent, this thing really doesn't look that unique. He looks more like a hairless old man with fangs. Still, no reason to let your guard down.
Trivia: -The whole thing about Santa and elves got started in the 19th century, when they appeared in several works of holiday literature, published or not. At one point, Santa himself was considered a "jolly old elf".
-The American library in the film has occult books in section 666. In real life, libraries usually have a section 666 for books on ceramics/allied tech only.