Nightmare (Monster High)

Nightmare is a character from the Monster High franchise.

Nightmare is a three-year-old, demonic horse and the near-inseparable pet of Headless Headmistress Bloodgood.

In the AWA fics, Nightmare is allies with the All Worlds Alliance.

Appearance
Nightmare is a bright blue horse with a blue-and-purple-pink mane, red-and-white-pink eyes that are red sclera (or "whites of the eyes") but they are not white, and are red, white-pink or pink-white irises, and blood-red, black-red pupils instead of fully black pupils; blue hooves, a blue tail with pinkish purple colors on it, a dark navy blue bridle over her head and muzzle with Skullettes on it, and long black eyelashes. She is large in size despite being only three years old.

Personality
She is prone to bouts of panic and fear at even the suggestion of something bad about to happen. She usually breathes fire.

Trivia

 * Nightmare's name, obviously, is a play on the fact that a nightmare is something unpleasant and that a mare is an adult, female horse. But "adult, female horse" is not actually what "mare" in the word "nightmare" refers to. In Germanic folklore, a mare or nightmare is a demonic spirit thought to sit on people when they are asleep and cause them a bad rest, which can manifest itself as a bad dream or even sleep paralysis. It is a coincidence that this creature is called a mare and a female horse is called a mare too, as the two words have different etymological histories.
 * In "Fright On!", it is released that she is 3 years old.