Jules Hedgehog was the husband of Bernadette Hedgehog, brother of renowned scientist Sir Charles Hedgehog and father of world-famous Freedom Fighter and hero Sonic the Hedgehog.
Bernadette Hedgehog (aka "Bernie" for short) was the mother of Sonic the Hedgehog and the wife of Jules Hedgehog.
After his father was turned evil because of an experiment gone wrong, Sonic and Robotnik teamed up to kill Sonic's dad with a giant robot.
Scourge the Hedgehog (formerly known as Anti-Sonic or Evil Sonic) was an evil version of Sonic the Hedgehog from Moebius. Unlike Sonic, Scourge mistreated others, was selfish and greedy, and had a great desire for power.
Sonia (also a speaking voice by Jaleel White and singing voice provided by Stevie Vallance) is the only female hedgehog member of the Sonic Underground and the sister of Sonic and Manic. Unlike her brothers, she was raised by an aristocratic foster family, giving her an upper class mentality.
Who did Sonic marry? In the "Mobius: X Years Later" arc, set in an alternate future, Sonic became King of Mobius, married to his love interest Sally Acorn, and had two children named Sonia and Manic (sharing their names with Sonic's siblings in Sonic Underground).
Manik Acorn (Light Mobius) is the son of King Sonic and Queen Sally and brother of Sonia Acorn. Manik bears great resemblance to his father, and has inherited his super speed and personality, but has his mother's eyes.
Knuckles the Echidna (Japanese: ナックルズ・ザ・エキドゥナ, Hepburn: Nakkuruzu za Ekiduna) is a character from Sega's Sonic the Hedgehog series. He is a red anthropomorphic short-beaked echidna who is Sonic's best friend and former rival. Determined and serious, but sometimes gullible, he fights his enemies using brute strength.
Big is a large, purple anthropomorphic cat, who is depicted as—while unintelligent—sweet, easygoing, and physically strong.
Regardless, Tails eventually caught Sonic and Fiona sneaking off together into the woods. The confrontation was heated. Tails later went so far as telling Sonic that he hated him before running off, heartbroken. But the betrayals didn't end there.
Amadeus Prower was a Mobian fox and father of the famous Miles "Tails" Prower.
Rosemary Prower was a Mobian fox and mother of the famous Miles "Tails" Prower. Rosemary is the wife of Great War hero and current Royal Army Commander Amadeus Prower, and sister-in-law to former-Royal Wizard and Neo Walker Merlin Prower.
During his time of service to the Royal Army in the Great War, Jules was mortally injured, and became the first Mobian in history to go through the process of roboticization to save his life, though the process robbed him of emotion and will.
Queen Aleena Hedgehog was the beloved leader in Mobotropolis city of the Sonic Underground dimension and mother to Sonic the Hedgehog, Sonia the Hedgehog, and Manic the Hedgehog. She was forced off her throne when Dr. Robotnik took over and placed a bounty on her children.
Sonia Acorn (Light Mobius) is the daughter of King Sonic and Queen Sally, and sister of Prince Manik Acorn. Sonia bears great resemblance to her mother, though has inherited her father's super speed and eye colour.
Scourge the Hedgehog, Sonic's evil twin, is on the attack! Leading the Antiverse in a full-scale invasion, Scourge's goal is none other than multiversal domination-with Sonic by his side?
Sonic is left on Earth. Longclaw is killed by the Echidna Tribe along with Knuckles' Father.
Maria was killed by delusional soldiers after releasing Shadow from a cryogenic tube in the Japanese version. in the English dub, they say she was taken away. She was dead for 50 years and she sometime reappears in Shadow's mind.
In the games, Sonic has never officially had a love-interest although it has been hinted time to time that he secretly loves Amy, while in the 1992 Shogakukan manga and Sonic X, he loved her. While in the original version he was muted, in the french version, he fuĺly says, I love you!
Five years after Christina's birth, Sonic and Sally decided to have another child, as Christina asked if she'll ever have a sibling. Nine months later, on the 13th of June, Jonathan was born.