Sonic Unchained

Sonic Unchained is a action-adventure video game in the Sonic the Hedgehog franchise. It is a non canon spin-off of the main series, set in its own continuity.

Main

 * Sonic the Hedgehog (voiced by Yuri Lowenthal) - The World's fastest hedgehog, and one of the core protagonists.
 * Shadow the Hedgehog (voiced by Josh Keaton) - Sonic's part-time rival, part-time ally, and a black hedgehog known as the Ultimate Life Form.
 * Silver the Hedgehog (voiced by Jack DeSena) - A futuristic hedgehog with psychic powers.
 * Sapphire the Hedgehog (voiced by Mae Whitman) - Sonic's younger sister, and a female hedgehog. Although she shares her brother's speed-running abilities, she is not as fast as he is, but has her own unique ability to hack Badniks to help her out.

Supporting
Those are playable in some extra events of the game:
 * Miles "Tails" Prower (voiced by Jessica DiCicco) - Sonic's best friend and adventure partner, he is a twin-tailed yellow fox who can fly by spinning his tails and propel himself in the air like a helicopter. He is also a scientific and mechanical genius and skilled pilot.
 * Knuckles the Echidna (voiced by Khary Payton) -
 * Amy Rose (voiced by Hynden Walch) - Sonic's childhood friend and love interest, and a female pink hedgehog who wields her Piko Hammer for self-defense.
 * Maria the Tiger (voiced by [Tara Strong, Kari Wahlgren, Alanna Ubach, or TBD]) - A young bengal tigress from the Mobian Tiger Tribe with a long blond hair and cyan eyes. Her powers include superhuman strength and speed, and the ability to control water. She also wields a spear of advanced technology. Maria is Shadow's close friend and comrade, and has romantic feelings for him (despite how old he is compared to her). The character has elements of Sally Acorn, Rouge the Bat, and Maria Robotnik.
 * Blaze the Cat (voiced by Melanie Minichino) - An indigo cat from Silver's world in the future with Pyrokinetic abilities, and who can run in superhuman speeds on par with Sonic. She is Silver's best friend, who has romantic feelings for him.
 * Sticks the Badger (voiced by Misty Lee) - TBD
 * Butch the Werehog (voiced by Gary Anthony Williams) - A werehog (a hedgehog's version of werewolf) from Silver's world in the future. He serves as Blaze's bodyguard and loyal companion. He is visually based on Sonic's Werehog form from Sonic Unleashed.

Supporting Characters

 * Nicole the Holo-Lynx (voiced by TBD) -
 * Chip (voiced by [Robbie Daymond, Nadji Jeter, Max Mittelman, or TBD]) - A purple winged chihuahua from Silver's future world.
 * The Chao - TBD
 * Omochao (voiced by TBD) - A mass-produced, robotic Chao with virtually unlimited knowledge about the entire world.
 * Longclaw the Owl (voiced by Nancy Linari) - An owl who has been Sonic and Sapphire's caretaker for years, and continues to be a mentor for them.

Antagonists

 * The Reaver (voiced by Christopher Judge) - The game's primary antagonist who is an ultra intelligent android out to erase all organic life from all existence.
 * Metal Sonic (also voiced by Yuri Lowenthal) - Sonic's robotic clone, and Eggman's former servant who defected to the Reaver.
 * Doctor Eggman (voiced by Maurice LaMarche) - Sonic's arch-nemesis, and a mad scientist aiming to conquer the world with his technology.
 * Orbot (voiced by Tom Kenny) and Cubot (voiced by Benjamin Diskin), Eggman's most trusted henchmen.
 * Snively Kintobor (voiced by Charlie Adler) - Eggman's estranged nephew, who resents from his uncle's abuse, and seeks to usurp him in his empire.

Premise
Set in a highly futuristic Mobius, four hedgehogs battle the forces of a mysterious enemy while each is chasing his own personal goal: Sonic, who is battling Doctor Eggman and TBD; Shadow, who is working to solve mysteries from the past while being hunted down by TBD; Silver, who is attempting to fix a rift TBD; and Sapphire, who TBD.

TV Tropes

 * See more here