Sonic the Hedgehog's primary biological brother is Manic the Hedgehog, introduced in the animated series Sonic Underground, where they form a band with their sister Sonia the Hedgehog to overthrow Dr. Robotnik. While Sonic has found family like his adoptive brother Tails in games and comics, Manic and Sonia are his true siblings in that specific continuity, often depicted with distinct musical instruments and personalities.
Sonic the Hedgehog was one of three royal siblings, alongside Manic the Hedgehog and Sonia the Hedgehog. He and his siblings are part of the underground resistance against the tyranny of Dr. Robotnik. He lives with his sister Sonia the Hedgehog and his brother Manic the Hedgehog in the Sonic Underground Zone.
Manic the Hedgehog, known for his distinctive laugh and drumming skills, is the younger triplet brother of Sonic the Hedgehog and Sonia the Hedgehog. They form the Sonic Underground and are leaders of the Freedom Fighters. Their mother is Queen Aleena. What instrument does Manic the Hedgehog play in the band?
Tonic the Hedgehog is a false identity assumed by Metamorphia in the Issue 52 story, Face From The Past. Metamorphia's Tonic appearance looks identical to Sonic before he got his powers, which was fitting since Tonic was supposedly Sonic's long-lost twin brother.
In the spinoff game, Shadow the Hedgehog, it's revealed that Shadow was created as the "perfect experiment" by the renowned scientist Gerald Robotnik, 50 years prior to the events of the franchise, with his resemblance to Sonic purely coincidental and having nothing to do with the two hedgehogs being related.
Sonia (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.
Actually black doom is real father of Shadow the hedgehog he was created by black doom dna.
Miles "Tails" Prower is a character created by the Japanese game designer Yasushi Yamaguchi. He is a major character in Sega's Sonic the Hedgehog franchise. Tails is an anthropomorphic fox with two tails (hence his nickname) who serves as one of Sonic's main sidekicks.
Tangle and Whisper from IDW are confirmed outside canon to be lesbian. There's a few scenes with them against a sky coloured like a lesbian flag. Nite the Owl and Don the Rooster from IDW are confirmed to be gay within the comics, mostly in how they care for Sonic together.
You may be looking for Sonia Acorn (Light Mobius) or Sonia (future version). Sonia the Hedgehog is the sister of Manic the Hedgehog and Sonic the Hedgehog from the Sonic Underground Zone.
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.
Sonic just doesn't like to be tied down. He's a guy who loves his freedom too much to commit to a marriage, regardless of how he actually feels about Amy.
Tom Wachowski is one of the two deuteragonists of the Sonic Cinematic Universe (alongside Miles "Tails" Prower). He is the Sheriff of Green Hills, the husband of Maddie Wachowski and the adoptive father of Sonic the Hedgehog.
King Sonic the Hedgehog was the ruler of a possible future version of Mobius, husband to Queen Sally Acorn and father of Princess Sonia and Prince Manik.
Romance. In a surprising turn of events, Tails ended up marrying Mina Mongoose, the two having been friends in their youth.
Knuckles the Echidna is a character from Sega's Sonic the Hedgehog series. He is an anthropomorphic red short-beaked echidna who is Sonic's secondary best friend and former rival. Determined and serious, but sometimes gullible, he fights his enemies using brute force and strength.
Sonic 3 introduced Knuckles the Echidna, Sonic's rival and later friend. All five of these have remained major characters and appeared in dozens of games.
Doctor Ivo "Eggman" Robotnik is a character created by the Japanese game designer Naoto Ohshima and the main antagonist of Sega's Sonic the Hedgehog franchise.
Scourge is a small black tom with one white paw, ice-blue eyes, glossy fur, and a torn left ear. He has a purple collar studded with teeth from dogs and cats, and claws reinforced with dogs' teeth.
He is an antihero who has good intentions but will do whatever it takes to accomplish his goals, putting him at odds with Sonic. Shadow first appeared in the Dreamcast game Sonic Adventure 2 (2001), although he was conceived during the development of Sonic Adventure (1998).
Starline is gay and has romantic feelings for Eggman, along with Whipser and Tangle also being seen as a lesbian couple. Mimic has also been said to have a boyfriend.
Cream and Tails are friends with each other. Throughout the games, there is not much contact between the two, but it is understood that they get along when they are shown throughout some story cutscenes.
"historicaly", Shadow is 50+. That means that he existed that long ago, because of being created around 50 years ago by Gerald Robotnik - Eggman's grandfather. "Techically" - not that much of an official word, but by it, I mean Shadow's body, the appearance, mostly.