Penelope Platypus

A member of the Substitute Freedom Fighters from Downunda, Penelope was one of several Freedom Fighters recruits chosen by Sally for a special mission meant to determine their potential. The mission resulted in the uncovering of Robotnik Prime's Auto-Automatons, a scheme that the Substitute Freedom Fighters-aided by Geoffrey St. John-were able to thwart. Penelope and the others would later come to the aid of Sally and her more experienced squad on several occasions, including a bizarre conflict involving a video-game link between Mobius and Earth and a period of time in which Sonic was bereft of his speed.

Penelope would later be elected to serve on the Council of Acorn.

Penelope is known to have a counterpart from Anti-Mobius who was briefly involved with Scourge the Hedgehog, but unlike the counterpart of Bunnie Rabbot she did not join the Anti-Freedom Fighters in search of vengeance.