Fiona Fox

Fiona is one of the few villains from the previous series. She and Scourge had break out from No-Zone jail and back to Moebius. However when arriving to Mobius, both Fiona and Scourge are rejected by the numerous people, until Fiona quits her villainess, attempting to join Team Fighters. She is remained as member of the group, so much for Sally's dismay. She is a girlfriend of Scourge the Hedgehog.

Personality
Unlike her counterpart, Fiona is uncharacteristically a good-natured person when she was on other people's sides, especially Sonic. She has a caring streak who cares and concern about the others and Scourge. She is spunky, smart and eager to get the hands on Dr. Eggman. She is clearly talks about the incident after breaking out from jail, has been resentment by the other Mobians until she ends her villainess ways attempt to fit with the good people. She still herself, avoids talking about the past even she had betrayed the Freedom Fighters for her dark personality.

It was soon revealed that Fiona has chosen the side of good, having a very big mistake for hurting the innocents, especially Team Fighters. This is due to Scourge's father about the Great Peace from the past. While she is on relationship with Scourge, both of them seems to get on well with the others, except Sally who does not approve of the way they change.

Romance
Fiona is a partner and girlfriend of Scourge. They are shown together when they are talking to Sonic and Tails to make peace with them after the incident between No-Zone and Moebius.