Siona the Hedgefox is a popular Sonic the Hedgehog fan character (OC) primarily known for being the biological daughter of Shadow the Hedgehog and Fiona Fox. As a "hedgefox" (a hybrid of a hedgehog and a fox), her design and backstory vary across different fan-created universes, but she is most notably featured in adult-oriented fan projects like Palcomix and Mobius Unleashed.