Born on Christmas Island, Sonic abandoned his home at an early age to pursue a life of adventures. He has spent most of his life traveling around the world and beyond, usually accompanied by his best friend, Tails. In his journeys, he has defended his world and others from various threats, especially his arch-nemesis, Doctor Eggman.

During his many adventures, Sonic has traveled from the ends of the world to the far reaches of space and time, earning many titles, allies, and foes. Known for his attitude and somewhat short temper, yet strong sense of justice and love for freedom, Sonic's victories have made him a celebrated hero. However, he remains indifferent to his fame, preferring to live on his own terms.