Manic the Hedgehog (Underground)

TV series
Manic was initially left on the doorstep of a house in the slums, placing him in the lowest role of growing up for the siblings: Sonic lived in an average home, while Sonia lived like a princess. When he was left behind by his mother however, Manic's basket was stolen - although the thief was unaware that it contained only a baby - and brought to the head thief Ferrell, who trained Manic as a pickpocket in the sewers and on the streets of Robotropolis along with many other young street urchins.

Archie Comics
Shortly after Manic, Sonic and Sonia’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 prophesy which foretold that she would have to separate with her children in order save their lives. Sending the siblings to three different caretakers, Manic was left on a doorstep but was stolen from his intended home by the thief Ferrell, who raised Manic as his favorite student. Manic would learn how to play drums and went off to form a band after meeting Sonic and Sonia. The Oracle of Delphius reappeared to tell the children of their origins. Shortly afterwards, Dr. Robotnik captured Farrell, as well as Sonic and Sonia’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.

Manic and his 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. Manic, Sonic and Sonia 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.

Manic, Sonia and Sonic would then team up with Sonic Prime and Zonic to stop the threat of Giant Borg. After defeating Giant Borg, Manic and Sonia 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 Manic and his siblings to continue their fight.

Around the time of Sonic Prime's absence following the Xorda Attack on Mobius, Manic and his 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 Manic was wiped from existence when the multiverse collapsed.

Appearance
Manic is a green-furred, anthropomorphic hedgehog, whose quills are shaggier than Sonic's and Sonia's. He wears a red vest, black spiked wristbands and an orange fanny-pack, which he seems to fit anything and everything in, from his drumsticks to his lock picks and to whatever he steals. He has black eyes, and his left ear is pierced with two small gold loop earrings in a 'punk' style.