Enderfolk

"Enderfolk" is the all-encompassing name given to creatures from the dimension known as The End, or beings descended from such creatures. The original inhabitants of the End were the Old Dragons, ruled by the Ender Dragon. Eventually however, an unknown species invaded the End, and though unable to kill the mighty Ender Dragon, they were able to hunt every last one of the lesser Old Dragons. Currently the only Dragon remaining is the Ender Dragon.

The End-natives
These creatures are all native to the End - or at least were first sighted in the end, or have no known prior events. Not all of these creatures remain alive to this day, however.

Ender Avis
The Ender Avis were a feathered bird of sorts from the End, with pitch black feathers, and purple features. They were hunted to extinction by the invading peoples for their feathers and for food. Little else is known about them, and there are none left.

Ender Ray
Ender Rays were a manta-ray-esque creature that float through the skies of the End, in a sort of parasitic relationship with the Ender Dragon. They fed off of two things - the purple liquid-y breath of the Ender Dragon, and the thoughts of unsuspecting visitors, making them a dangerous foe. Thankfully, when the End underwent a vast climate change, they mostly died out, or had to escape.

Phantoms
Though Phantoms as we know them are not a creature of the End, they are instead descended from the ancient Ender Ray. When they fled to the overworld, they lost the pitch black and purple colouring that the Ender Ray had for camouflage while in the End, and eventually they were infected by the Overworld's zombifying virus in the air. Now, they are an undead terror of the skies, attacking those who haven't slept due to being able to sense the hyperactive thoughts. None have been seen in a while though...

Dragons
The Dragons - now known as Old Dragons - were the kings and queens of the End. They roamed the skies, feasting on any foolish enough to try and invade upon their territory. When the invaders came however, and were driven from the central island by the Ender Dragon, the invaders instead hunted and killed the many, many other dragons. Now, they are all gone, used as figureheads for the floating ships. Only one Dragon remained...

The Ender Dragon
The last living Dragon, and the only one seen in recent millennia. The Ender Dragon was the biggest, strongest Dragon, and her very existance was what drove the ancient people who invaded the End to kill the other Dragons.