Krystal
Krystal (クリスタル Kurisutaru) is the sole survivor of her doomed home planet, Cerinia. She made her first appearance in the series in Star Fox Adventures, where in search of answers to her planet's destruction, and the death of her parents, she comes across a distress signal from the planet Sauria (also known as Dinosaur Planet).
Krystal was originally designed to be a main character of Dinosaur Planet before Nintendo turned the project into a Star Fox title. Her original design was that of a 16-year-old orphaned feline, who was raised by a wizard named Randorn. When Fox became the main character of Adventures, Krystal was redesigned into her present form as a 19-year-old[2] orphaned vixen, and her role in the game became that of a damsel in distress.
Krystal's past is shrouded in mystery. In Adventures, she carries with her a powerful staff capable of shooting energy blasts (among other abilities), which soon falls into Fox McCloud's hands. Without her staff, however, Krystal is capable of telepathic powers, including the ability to sense thought patterns from others, which is used in Star Fox: Assault, and in her dialogue in Star Fox: Command.
Fox allowed Krystal to become a full-time member of the Star Fox team, and the two later pledged that they would never be without each other.
In the prologue of Star Fox Command, it is stated that Fox was worried about Krystal's safety, and broke up with her. The heartbroken Krystal left the team, and nobody knew what became of her for a long time. Depending on the route the player takes, she reappears as either a member of Star Wolf (where she has begun a relationship with Panther) or a member of the Cornerian Army. In the game, in some missions she pilots a Cornerian Fighter (similar to Bill Grey's) or the Cloud Runner (クラウドランナー Kuraudorannā), named and designed after one of Sauria's tribes.
In one briefing in Star Fox Command, Krystal paused before talking to Fox over the communication link. It is unknown if she was still angry at Fox or relieved to see him.
In three of the endings of Star Fox Command, Krystal forgives Fox and goes back to him. The second one shows her and Fox getting back together and having a son called Marcus, who would lead a new Star Fox team. The default ending shows her rejoining Star Fox, but after a few months, she leaves once again to go back to Star Wolf without regrets. In the Star Wolf Returns ending, despite Star Wolf's success, she is publicly known as a traitor of Star Fox, and eventually, unable to face her mistakes, she leaves and changes her name to Kursed, becoming a bounty hunter (eventually encountering Fox on planet Kew, yet he does not appear to recognize her). In the Japanese version, she does not change her name. After beating the Pigma's Revenge final mission, while the ending itself doesn't show what happened afterwards with Fox and Krystal, when Slippy talks to Falco about their victory against the anglars, he also says Fox and Krystal "made up and everything".