Sonic's main claim to fame is his ability to achieve speeds faster than Mach 1 (the speed of sound) which has earned him nicknames like "The Blue Blur" and "The Fastest Thing Alive". He is supposed to be very young and often recognized as being somewhat cocky, self-absorbed and ignorant, while still retaining strong sense of justice with a large heart, a friendly personality and an attitude like the wind. 

Vocal Direction (Ryan Drummond/Jason Griffith) as much I respect Roger Craig Smith but It doesn't suit for Sonic in this case please understand