Princess Luna

Nightmare Moon/Princess Luna is a Pegasus Unicorn Pony who possesses a mane of dark mist. She is the sister of Princess Celestia.

History
A thousand years ago Nightmare Moon was imprisoned in the moon by her sister, Celestia, for trying to plunge the world into eternal night. On the Summer Sun celebration one millennium later, she broke free.

Personality
Initially vengeful upon her release, when she was defeated by Twilight and the others with the Elements of Harmony and returned to her Princess Luna for

Powers and abilities
Being one of the two Pegasus Unicorn Ponies, Nightmare/Luna possess magic far beyond normal unicorn ponies.