Thanks to a Reddit Post, I recently became aware of the existence of what appears to be a promotional booklet given to press and attendees at E3 2002 about Star Fox Adventures. Not entirely sure if that's the source, but that seems likely. Anyway, I quickly found one for sale on Ebay and purchased it. The intent is to scan its contents so you can all see what it contained. There isn't anything super earth-shattering in there as far as I can tell, just the type of stuff you would find in the instruction manual plus a little extra explanation of the game. However, it does provide additional confirmation of Krystal's backstory. Here's what it says about Krystal.
KrystalSex: FemaleEyes: BlueDescription:
She's not officially part of the Star Fox Team, but Krystal shares the team's interest in seeing General Scales and his SharpClaw army go down in flames. Roaming the galaxy in search of information about the demise of her home planet and family, Krystal has been drawn into the fray after answering a distress call from Dinosaur Planet. After a short adventure in Krazoa Palace, she will be in need of assistance, too. Eventually Fox and Krystal's paths will intersect -- after peace returns to the planet.
Here's what the cover looks like: