It was after Reach fell that there was a mission for the Master Chief. To find a little girl of 6 somewhere out on the reaches of her own home planet of Luna which when the seasons changed, it felt like one of the Halo rings.
Her name was Jinx and she was found at the temple. She willingly took the Chief's hand while her voice danced a bit in his head asking,"Am I needed to become a Spartan Master Chief?" as she tilted her head back and looked into the golden visor.
Of course, her eyes were of the purest gold and her mane of the purest silver as well and she had been given her answer as a pelican arrived to pick them up. Since she was an only child without any known family, she began her training.
As she and the others grew, she kept her team inspired till most had died from the augmentations that were implanted by surgery and she survived just like the Chief did. However, her ears are like those of a cat and she knew that she had to be honest with Dr. Hasley about her parentage.
Jinx told her the truth."My parents were the feline mystics known as Simon and Louisa Dr. But they both died when I was just 4 years old. Since the Chief brought me into the Spartan program, I knew that this will become my new family." And since her parents were both humanoid felines, so was she and her fur is blacker than pitch and ever blacker than the blackest night.
But, aside from her legs being like those of an actual cat, she has the eyes of purest gold and mane of purest silver had offset her own armor colors of russet gold and black as well.
But it was also her helmet which attracted attention as well because it had to be taken into account her ears and her nose were feline in nature. But, this will follow Jinx's story since she is the only feline who ever became a Spartan.