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Gancanagh - He's the faerie Don Juan, seducing human women. They die eventually, pining away for love of him. He carries a clay pipe, although he does not smoke it - faeries generally detest smoke.
Gans - Apache Indian shamen offer prayers to the Gans, asking them to drive evil spirits away and to attract good fortune.
Ghillie Dhu - He is a solitary Scottish faerie who can be found amongst birch thickets. He is clothed with leaves and moss.
The Glaistig - She is a water faerie, a beautiful seductress with the body of a goat which she hides under a long billowy green dress. She lures men to dance with her, then feeds like a vampire on their blood. She can be benign as well, often tending children and the elderly or herding cattle for farmers.
Goblins - They are somewhat malicious little creatures. They can appear as animals. They are thieves and villains and count the dead among their companions. They like to tempt people with faerie fruits. They're not truly completely evil, however. Mine goblins make knocking noises where they know there are rich deposits of ore. To avoid the Knockers' wrath, a pastie (traditional miner meal) should be left for them.
Golem - a Jewish zombie-like spirit.
Grant - a small horse which stands upright; each Grant is attached to a particular place and when he senses danger will tun through the town shouting warnings.
The Green Lady of Caerphilly - She haunts ruined castles, and often appears as ivy. Guillyn Veggey
Gwrgedd Annwn (Gwrageh anoon), the water faeries who are though to live in a submerged town beneath a lake. They are occasionally known to take human husbands, but if the mortal should strike his wife, then she will leave him, never to return. Long ago, on every New Year's Day, a door would appear in the side of a great rock next to a certain lake. Those who entered found that it lead to a passage that ended on the island in the middle of the lake. This island was a beatiful garden kept by the Gwrgedd Annwn, who would serve wonderful food to the travelers and treat them as honored guests. They warned the fortunate mortals that the doorway was a secret and that nothing could be taken from the garden. One mortal took a single flower from the garden and as soon as he touched the soil of earth, all of the other other travelers were expelled.
Gwyllion - The Gwyllion are one of my favorite types of faeries. They are Welsh mountain faeries whose only known occupation in to sit amongst the rocks along mountain paths and stare evilly at those passing by, creeping the travellers out. For some reason I find that incredibly cool.
Hags - They are the personification of winter in the British Isles, and are thought to be the remnants of the most ancient godesses. Some hags turn from hideously ugly (their usual state) to breathtakingly beautiful at the turn of winter to spring.
Hathors - Nature spirits of Egyptian mythology. When a child is born, seven Hathors gather to plan the life of the child. The Hathors are often portrayed as the sky-goddess Hathor, goddess of beauty, love, marriage, and childbirth. She often takes the form of a gigantic cow.
Hobgoblin - They have a bad reputation since the Puritans used their name to refer to wicked Goblin spirits, but they're really a sort of friendly Brownie. They are helpful at times, but like practical jokes. But don't annoy them or they can become nasty.
Huacas - Incan myth speaks of Huacas, stone forms of sprits or divine beings who watched over fields.
Huldafolk - the huldafolk are fairly reclusive Scandinavian faeriefolk. Shy doesn't even begin to describe them. But in their dealings with humans, they are very fair, even generous when they experience human kindness. The story goes that there was once a farmgirl who came across a woman giving birth in a field. She helps her to deliver the baby and is rewarded with an apron full of woodchips. Disgusted, the girl dumps them out and returns home. Then a look at her skirt reveals that the chips still stuck to her apon had turned to gold. She went back in search of the rest of the woodchips but they had disappeared.
Hyter Sprites - They are faeries from East Anglia. They are able to appear as sand martins (a type of bird).
Jack-In-Irons - He is a giant from Yorkshire who haunts lonely roads.
Jenny Greenteeth - She is the Yorkshire River version of Peg Powler. (More information there.)
Jimmy Squarefoot - His appearance is said to be frightening, but he is actually harmless.
Jungle Spirits - The Amazons believed in an amazing variety of ogres, demons, and powerful spirits, often shaped like animals. Some were ghosts of the dead. They also regarded birds as demonic spirits who battled with dead spirits.