This is Mist, for 's contest.

"Watch the movie, pick out a member of the herd pictured in the movie (one without a name), and draw it, giving it a history, name, and personality. Can be the foals he grew up with, or a herd member from any point in the movie. "

Link to screenshot: [link]

Name: Mist
Color: Grullo
Age: 9

Story:
Mist was Esperanza's sister, yet she didn't share any traits with her palomino sibling. Her coat was like that of fine silk, and she was built less like a mustang, and more like an Arabian or Saddlebred. Mist highly disliked her sister. She fell in love with the grand stallion, Strider, yet the black horse didn't share the same feelings for her. Yes, the lead stallion had foals with many different mares, but he seemed to have a problem with her. She never had a foal, as she always wished. She tried to win him over, but her sister, Esperanza became lead mare, and Strider's mate. Mist constantly glared at her sister, envy in her eyes. The palomino mare, oblivious, didn't even notice her sister's feelings. After Strider's death, the spunky, fiery mare lost her spark. The depression that overcame her was almost unbearable.
After Esperanza's colt, Spirit's birth, Mist's feelings just kept growing. She was fond of the buckskin, but envious. She wished that her was her foal, hers and Striders. Spirit grew, and became leader himself.
She stood in a field, calmly grazing on the lush graze. Esperanza stood, staring at Mist. "What?" the gray mare snapped. "Sister, your troubled," she murmured. "Oh, do you think? I've been troubled for the past five years!" she squealed, baring her teeth. "And you've just... haven't noticed. At all." Esperanza stood, dumbfounded and shocked. "I'm sor- Don't be. After all, you're [i]lead mare[/i]. She turned and galloped to the other side of the field.
The moon blanketed the field in soft white light as mist looked back once more at her herd. She couldn't stay here, not whenever she looked at her sister, fire burned in her heart. She sighed, turning around and bolting into rhe darkness.

It kinda cuts off now, but I thinks it's better for the contest. If you want to see the rest of the story, anyone, I'll send it to you.