She is an orange tabby cat.
After seeing the boys play with Bruiser, the girls decided they wanted their own pet. Their question was answered when they found a lost ocelot kitten (she had fallen off the truck that was taking ocelots to a sanctuary) which nearly drowned in a river but was saved by Maguro. She was then tamed and trained. But mainly Salmon wanders around the Digital World as a "stray" cat.