The Dragons as a species started in the year 0. The first six known Dragons, are the Platinum Dragons. Bahamut, Tamara, Lendys, Cildra, Zalezo, and Imbross. These six Dragons laid eggs over time, and from these eggs, new Dragon species were created. Orange, Green, Yellow, Red, Blue, and Purple respectively. There are also legends about two other Dragon-types, but no one knows for sure.
Dragons are categorized by color, breath type, and body type. Each color is further discussed below and has three corresponding breath weapons, detailed on its own page: Dragon Breath Weapons. The body types are not bound to a specific color, these are the different types:
Draco; quadruple, wings
Drake; quadruple, no wings
Wyvern; bipedal, wings as arms
Raptor; bipedal, no wings, but does have arms
Lung; serpent body, wings, with other limbs
Amphithere; serpent body, wings, without other limbs
Lind; serpent body, no wings, with other limbs
Wyrm; serpent body, no wings, without other limbs
There are some other classificational terms used sometimes, in addition to the three above, like Hydra.
Dragons are intelligent, but lack the ability to learn to talk on their own, and cannot cast spells until they're older.
Commonly known as Sea Dragons. These Dragons live in the deep oceans. They are known for both water and sonic blasts, with various 'fun' effects.
The fierce Green Dragons live in swamps and jungles. They have varying types of saliva, useful for incapacitating their prey. They are fast and silent, and very sharp.
Yellow Dragons are known for being amazing fliers. Not necessarily fast, but perfect for riding, comfort, and long flights. They are accustomed to extreme cold, and can shoot ice.
The most toughest of Dragons, often called Boulder- or Rock Dragons. Their hide is so thick it makes them hard to kill for the inexperienced.
The Purple Dragons are extremely fast and tend to strike their opponents down before they're spotted. They're breath weapons resemble this as they can shoot lightning and similar fast attacks.
The hot heads amongst the Dragons, known for their ruthlessness and hot fire. They tend to roast their food, and just stoke fires in general.