Orc

  The Orc/Ork is a fantasy race that are often twined with Goblins. They are humanoid creatures that come in many shapes and sizes, often with bowed legs and long arms. They are generally ugly and filthy, with prominent fangs and facial features tending toward the grotesque, their skin is typically a shade of green, grey, black, brown and sometimes red.

 Their temperament matches their looks. Ugly, aggressive and cannibals to boot, often eating their own kind. They are used for soldiers, mostly cannon fodder because of their low intelligence, strength and violent by nature, they will fight ferociously if compelled or directed by a guiding will, but tend towards more chaotic behavior if left to their own devices.

  Old English glossaries record the word OE orc matches with the Latin Orcus, deity of the Underworld, and Synonymous with thyrs "ogre" as well as "hell devil".
  The word ultimately comes from the Latin, the demonic Roman god of death, who should not be confussed with Pluto, the god of the underworld and has transformed by several stages from the meanings 'underworld', 'hell', 'devil', 'evil creature' to 'ogre'.

 They have been portrayed through fairy tales and fantasy for a long time, but the most famous has to be J.R.R.Tolkien's reinvention of them in his stories the most famous being the Lord of the Rings trilogy. Where they have a some thing like a culture of their own and their own language.

Brownies

 The Brownie is the Scottish and Northern English counterpart of the Scandinavian Tomte, the Slavic Domovo and the German Heinzelmannchen.

Brownies are said to inhabit houses and aid with the upkeep and tasks around the house. Although they hate to be seen so work at night or when there isn't anyone at home, they would become fiercely loyal to their families and would move with them to a new house. They take food as gifts for their help but they are very difficult to keep happy and can get very aggressive or even leave if their gifts are called a payments, the owners misuse them are called by a name or nickname or if they are thanked. They are known to like honey, milk and porridge the best and many would leave them out daily. They make their nests or homes in unused parts of the house, like holes in walls or lofts.

Depending on where you are brownies can vary in their looks, normally they are short, often male but in the highlands they don't have fingers and toes and in the lowlands they didn't have noses.

  There are a few tales and ballads about the brownies but not many. But there are differences between the English Brownie and the Scottish Urusig. The English brownie lived in the house and helped with domestic tasks as did many in the Scottish manor houses but the Scottish Urusig wasn't domestic and lived in or by streams, it had a generally nice temperament and like to be solitude but around the end of harvest would come out to get some of the it's favourite dairy products from the milkmaids.

  The only people who could see the brownies where the ones who possessed the second sight, which enabled them to be able to see anything from the sprite or fay world. But they where said to appear to certain people if they didn't have it.

  Although there is a general blanket description for brownies they are several different types. When they where miss treated they would turn into Boggarts with sharp teeth and wild hair. These where horrible are violent, throwing things, stealing and breaking things, tormenting the people living there and spoiling food and milk.

  There is the Brown Men that are a type of brownie that live on Bodmin moor in Cornwall England, you will never see these little red haired men, they look after all the wild life that live on the moor with them. Similar to the Brown Men are the Gruagach, brownies that live in the Hebrides off the coast of Scotland and are thought to watch over farmers’ herds. Early legends say that they were given offerings of milk in order to ensure that they would watch over flocks and herds and keep all of the animals safe. A brownie-clod was a type to live outside and cause havoc by throwing mud at anyone that came near, a Dobbie was a simple minded but well meaning brownie that unintentionally caused chaos (these are the ones that inspired the house elves and their name sake Dobbie in the Harry Potter books).

  The brownie also isn’t to be confused with the browney, which is a different type of mythological creature. The browney comes from Cornwall, and it’s thought to watch over hives of bees. 

Dragons

There are 2 types of dragons. European and Asian. although with the mixing of cultures in recent centuries the myths have started to influence each other.
The name dragon came into the English language around the 13th century, it was taken from the old french (dragon) which again in turn was taken from the Latin draconem (or draco) also from the Greek word δράκων, drakon, meaning huge serpent. This was used for any large serpent or sea snake not just mythological creatures.

Dragons are typically depicted as large reptiles with 2 sets of legs and bat like wings and fire breathers but this image started in the middle ages before this they where seen as giant serpents (this isn't to be mixed with a dragon-like creature with wings but only a single pair of legs which is known as a wyvern).

There are meany different myths and stories about the dragons to match the many different cultures and religions that these stories come from. But there are many types of creatures that come under the blanket name of dragon.
East Asian cultures are thought to have the oldest myths about the dragons. They where long giant serpents, most of them water deities. They where known for their great power and wisdom and seemingly endless lives. They where associated with the Chinese and Vietnamese emperors because of the power and wisdom they where suppose to hold. They are said be made up from 9 different animals, with nine sons, each with its own imagery and affiliations.  They are also seen as  the symbol of yang, representing the universe, life, existence, and growth. It is said in Vietnamese myths that the people are descended from a dragon and a fairy.

South and west Asian are roughly the same as the eastern but some are seen as protection (like on gates and clothing) and others (like the Persian dragons and other such creatures) where all malevolent. The Jewish religious text have a few mentions about dragon through out i.e. the book of Job and  Isaiah.

But it's not just Asia that has the myths of dragons, in Europe they have many tales. We get the name dragon on the Greeks but it was meant more for snakes then winged reptiles in myth form. European dragons are usually depicted as malevolent under Christianity; pre-Christian dragons, such as Y Ddraig Goch, the Red Dragon of Wales, are seen as benevolent, they are seen as huge winged reptiles that live in rivers or deep caves with armored hides and although they have wings they rarely fly. Slavic dragons are very similar although their names typically mean snake. Russian dragons are seen to have 3 heads and if all the heads aren't cut off they will grow back.
The tales of dragons have changed over the centuries and have become fixed in the fantasy, filling books and movies with these mythical creatures. They where often seen as big, greedy, mean and to be feared until the hero comes along and slays said dragon in a right of passage. Or the mystic wise figure that's a great ally that helps battle fears. Typically they where twisted to represent sin and a natural force against mankind.

There are many animals that could have sparked our ancient ancestors into believing that huge winged reptiles and snakes where alive such as crocodiles, giant snakes and even whale and dinosaur bones.

But as we come into a new age they are getting new life  with every kind of twist you could think of i.e. the elemental, fire, water ect all with magic powers and with all this new interest comes a new law for the dragon creature.