Sonia the Hedgehog (Underground)

TV series
Sonia is one of the heirs to the throne of Mobius, who are prophesied to rule as the Council of Four. In order to fulfill this prophecy, Sonia was separated from her family shortly after birth. She was raised by the wealthy Lady Windimire until when Windimire was roboticized by Doctor Robotnik. Following the "song in her heart," she reunited her brothers Sonic and Manic. After a period of training, she and her brothers set out to find their lost mother, defeat Dr. Robotnik, and restore order to Mobius.

Archie Comics
Shortly after Sonia, Manic, and Sonic’s births, Dr. Robotnik would seize power of Mobotropolis and convert it into the polluted and metallic city of Robotropolis. A bounty was placed on the children of the queen, and thus Aleena was forced to take them into hiding. Eventually, the Oracle of Delphius appeared before her with a prophecy which foretold that she would have to separate with her children in order save their lives. She sent the siblings to three different caretakers, and Sonia was placed in the care of Lady Windermere, an aristocrat. Sonia would learn how to play the keyboard and went off to form a band after meeting Sonic and Manic. The Oracle of Delphius reappeared to tell the children of their origins. Shortly afterwards, Dr. Robotnik captured Lady Windimere, as well as Sonic and Manic's guardians, and roboticized them. It was then that the three hedgehog children would form an alliance with each other to locate their missing mother.

Sonia and her siblings would engage Robotnik in battle many times. Evil Sonic would appear in Manic's reality on a mission from Robo-Robotnik v1.0 to recover the Giant Borg. Believing Sonic also possessed a piece of the Giant Borg, he located and interrogated him and his siblings. The evil hedgehog departed only for two new Sonics to appear: Sonic Prime and Zonic the Zone Cop. Sonia, Sonic and Manic mistook Sonic Prime for Evil Sonic until the two new hedgehogs explained who they are. Zonic would remark how he had a lack of data on Sonic and his dimension and would request an explanation of their reality’s history.

Sonia, Manic and Sonic would then team up with Sonic Prime and Zonic to stop the threat of Giant Borg. After defeating Giant Borg, Sonia and Manic freed Evil Sonic from jail after Robotnik imprisoned him. For helping Robotnik get the components of Giant Borg in the first place, Evil Sonic was then taken into custody by Zonic, who left Sonia and her siblings to continue their fight.

Around the time of Sonic Prime's absence following the Xorda Attack on Mobius, Sonia and her siblings made a visit to Mobius Prime as part of an Interdimensional concert tour.

Due to being part of the old multiverse, it is likely that Sonia was wiped from existence when the multiverse collapsed.