Pyrite

Appearance
Pyrite is a small black wolf with gold/light gray speckles.

Personality
Pyrite is an impulsive, deceptive, and selfish wolf, willing to do whatever it takes to get what she wants.

Midnight
Midnight and Pyrite always had a bad relationship, and Pyrite impersonating her sister to get her mate didn't help that. Midnight was always the strong, compassionate wolf that Pyrite was jealous of and would always attempt to beat in some way before ultimately failing.

Coal
At first Pyrite and Coal got along well as Coal believed she was Midnight, until Coal woke up one day with the feeling that something wasn't right with Pyrite. She eventually started acting like herself, impulsively attacking moose and anything nearby, which ultimately led to Coal realizing Pyrite wasn't his mate and confronting her. She apologized and pleaded to him to let her stay, revealing she was hopelessly in love with the wolf that only her sister, Midnight, (who she revealed was probably alive), could have. Coal turned her away but Pyrite wasn't ready to let go, attacking a bear for a bison carcass in hopes that she could defeat it and earn Coal's love. Instead she died with Coal turning a blind eye to the fight.

Death
Pyrite died while trying to impress Coal by defeating a bear and her cub over a bison carcass. She quickly was killed as Coal turned a blind eye to her and the bears.

Trivia

 * Pyrite is fool's gold, and her name was chosen by the fact that she was the fool's version of Coal's gold, Midnight.
 * Pyrite was supposed to die from the bear fight over the bison carcass, but survived at 2% health. Eventually Star managed to kill her in a different place to the same bear, but shifted the story so that she died in the original attack.