Krystal was considered as a potential playable character during development, but was passed over in favor of Wolf, both because of time constraints and because Wolf's movement and animations would be more similar to Fox's and would require less development.
As one of the many Star Fox characters who can be contacted via the Star Fox Smash Taunt on Lylat Cruise. Krystal appears in conversations triggered by all three potential characters: Fox, Falco, and Wolf.
Krystal reprises her role in the Star Fox Smash Taunt on the returning Lylat Cruise stage, and once again appears as a trophy in both versions.
Krystal debuts from Star Fox Adventures. At the beginning of the game, she wields a staff to assist her telepathic abilities. She eventually loses the staff before being imprisoned by General Scales. Fox eventually finds the staff and uses it throughout the game.
Krystal's appearance as an assist trophy is based off of her appearance in Star Fox Adventures and her ability to use the staff is based on the opening portion of said game.
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