Fiona Fox is a character from the Sonic the Hedgehog comic series. Initially imprisoned by Dr. Robotnik, she escaped and became a treasure hunter. She later joined the Freedom Fighters, showcasing skills in computers and medicine. Fiona developed a relationship with Sonic, but secretly also had a relationship with Scourge, Sonic's evil counterpart from another dimension. This betrayal led to her leaving the Freedom Fighters and working with Dr. Finitevus and Scourge. She later led the Destructix, a group of mercenaries. Fiona's complex history involves shifting alliances and a complicated romantic life.