These aren't diretcly the exes character nor the physical form of Sonic.exe, they're actually hallicinations caused by the hedgehog's twisted catridge, wich they aren't capable to take a human's soul, but they can damage mentally their victim, even being able to cause their dead. The Sonic costume is a possesed abandoned costume of the blue blur, it was abandoned at a 90s closed Sega Amusement Park.