Gender: Not applicable (but referred to as female)
Species: Robot
First Appearance: Sonic the Hedgehog #28
Information: Fiona is a leftover auto-automaton that was programmed to fall in love with Tails. Robotnik ordered her to destroy Tails, and Fiona obeyed by trying to drown Tails. Eventually Fiona rusted and Tails set her up as a memorial to his lost love.