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This character exists primarily within the Sonic Underground continuity.
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
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"Sonia" redirects here. Not to be confused with Sonia Acorn.

Sonia the Hedgehog is one of the main characters from the Sonic Underground television series. She is an anthropomorphic hedgehog and the sister of Sonic and Manic the Hedgehog, as well as the daughter of Queen Aleena. She is also a member of the Sonic Underground and one of the current leaders of the Freedom Fighters along with Sonic and Manic.


Sonia is a slim, anthropomorphic hedgehog with fuschia pink fur, pink hair in a style of straight spikes and a full fringes, peach skin, and black eyes like her siblings.

For attire, Sonia wears a dark red dress with a short dark purple skirt and a red sleeveless top. The two sections are separated by a gold belt that forms a pointed shape at the front with a small circle in the center of the belt. Unlike most Sonic characters who wear short gloves, hers are long purple ones, and go halfway past her elbows rather than the stereotypical white hand gloves. Sonia also wears red stockings under dark purple boots, the toes of which are a matching red.


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 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

Sonia, from Sonic Super Special #10.

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.[1]

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.[1]

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.[1]

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.[2]

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


As she was raised with luxury and wealth, Sonia tends to be quite high maintenance, spoiled and snotty. She hates getting dirty and constantly worries about the condition of her hair and clothes. Although she appears to be selfish, she is generally good-natured and helps those that are in need. Sonia is known to occasionally talk like a valley girl. Sonia always addresses her mother as simply "Mother" due to being raised in a polite society.

Despite all this, Sonia has been shown to like performing daring acts, such as walking on a high brick wall. She is also very athletic, and appears to be good at gymnastics. Sonia is very self-sufficient and does not hesitate in taking on any threat or challenge that she may encounter, often coming out on top. She likes to think things through and on many occasions, has helped her brothers out of their own troubles (although she sometimes thinks of them as nothing more than pains). Sonia hates messy things like dirt and mud.

Powers and abilities

Sonia is physically the strongest of her siblings. She is able to lift heavy objects as well as destroy barriers of various materials. She is skilled in martial arts, which she uses for offensive and defensive measures, and is also extremely agile. She does not have Sonic's speed, but is able to use the "Sonia Spin", where she spins in a cyclonic manner. She also has a photographic memory.

Sonia is a very talented singer and keyboard player and has been a great pianist since childhood, as shown in the episode "Beginnings". In the song "Liberty's Gonna Rock", Sonia is shown to be able to play the piccolo as well.


Sonia's medallion transforms into a Keyboard synthesizer which is capable of firing laser blasts as well as creating smoke screens. The keyboard also transforms into a laser rifle which she uses to attack.




Sonia was engaged to Bartleby at the beginning of the series. Eventually, the engagement was called off for unexplained reasons, but it can be assumed that it was because she was in the Resistance while he was an aristocrat.


When an orange tiger named Stripes greeted Sonia, he fell in love with her. However, he was working for Dr. Robotnik, who was trying to pin the location of the Sonic Underground. Stripes gave away the locations of Sonic and Manic, but did not mention Sonia because he did not want Robotnik to harm her. After Sleet and Dingo showed up, they planned to roboticize everyone in the village including the Sonic Underground, but in turn Sonia saved Stripes. After being saved, Stripes tells the villagers to help protect the village from Robotnik. After Sleet and Dingo fled the village, he tries to make Sonia stay but she plainly states the business she does with her brothers is too important and says they would come back when they needed a little rest and relaxation.

Knuckles the Echidna

It was obvious that Knuckles the Echidna and Sonia fancied each other. When Knuckles disappeared in "New Echidna in Town", Sonia got really upset, almost to the point of tears. Manic even claimed, after Knuckles had returned, that Sonia was ready to give up Mobius to rescue him. When Knuckles told Robotnik not to roboticize the Sonic Underground, he paused on Sonia's name. Robotnik double-crossed him and went to roboticize Sonia first, which in turn made Knuckles angry. At the end of the episode, she kissed him on the cheek and they held hands.


Sonia is the object of a crush from Robotnik's muscular henchman, Dingo, but she constantly rejects him and shows him nothing but contempt, despising him for his evil ways and being disgusted by his ugly appearance.

In other media

Sonic & Sega All-Stars Racing


Rip of the Sonia artwork found in Sonic & Sega All-Stars Racing.

In the Wii and Steam versions of Sonic & Sega All-Stars Racing, Sonia appears on a playing card representing the Queen of Diamonds which can be spotted on the ground of the race track, Roulette Road. Sonia's head was taken from a piece of fan art from drawn by a user formerly known as Lightning_duchess and RianaLD ( Now ArtByRiana). Steve Lycett, Game director commented on the cameo by saying; "We take these things seriously at Sumo and will be contacting the original artist directly to offer our sincere apologies to her, this was entirely unintentional. Not much else I can really add!" Pure speculation indicates that designers may have thought it was Amy (since other Queen of Diamonds cards in the game depict Amy) and thought the picture was official Sega artwork. More speculation reveals there may have been a Sonic Underground fan on staff who put the card in there as a little treat to those who remember the decade old cartoon show and may have forgotten to ask permission.[3]


  • In the opening theme, a young Sonia is shown riding a tricycle with tan arms and legs.
  • Sonia is the only major female protagonist to be voiced by a male; she is voiced by Jaleel White in English, along with her brothers.
    • However, Sonia's singing voice is performed by an actual female, Louise Vallance.
  • Unlike her brothers, Sonia does not have tan colored arms and stomach/chest. In the episode "The Jewel of the Crown", she is mistakenly shown to have tan skin on her stomach.
  • Sonia is the only triplet to have a visible neck.
  • Sonia is the only one of the royal siblings that made an appearance outside of the TV show and comics, as she made an accidental cameo in Sonic & Sega All Stars Racing.
  • Sonia's singing voice is so remarkably different from her regular voice that it sounds country-like, as opposed to Sonia's normal high pitched, "girlfriend" voice. However, in "Fun in the Sun", she can sing very low.