Alésia Glidewell
Alésia Glidewell played Krystal's voice in Star Fox Assault and Super Smash Bros. Brawl. She also provides the voices of Knuckle Joe and Zero Suit Samus in Brawl. She has a lot of voice acting, television and film acting, and voice overs. She is likely most famous as the face and body model for Chell, the protagonist in Portal. She has dark brown hair, loves animals, and speaks several languages.
Hear some of her work in Star Fox Assault and Super Smash Bros. Brawl. She was also gracious enough to provide the Krystal Archive with a recording of her original Krystal audition.