Silver the Hedgehog

Silver the Hedgehog is a character who first debuted in Sonic the Hedgehog (2006) but was subsequently erased from history due to the events of the game.

A second Silver the Hedgehog would later debut in Sonic Rivals with a new but similar backstory, and essentially take over the original Silver's role, being the one to appear in all further instances of the character (with the possible exception of Sonic Generations)