Scourge the Hedgehog was once known as Anti-Sonic, or Evil Sonic, and occasionally appeared in a few issues of the classic run to square off against his heroic counterpart. However, when Scourge attempted to steal the Master Emerald along with Rouge, he used the Chaos energy of the emerald to intentionally become stronger than Sonic. But after Locke punched him while in the middle of absorbing its energy, Scourge transformed into a green-hued individual that could finally be distinguished from Sonic.

Scourge is still Anti-Sonic at heart, still possessing Sonic's traits and abilities, while also being a conniving jerk and ill-tempered. Scourge does not have friends, and views his Suppression Squad as nothing more than pawns to help him prove he's the best. Additionally, Scourge doesn't see fighting as a sport, but rather something to prove that he is the greatest and an excuse to deliver excruciating pain, and, if given the chance, kill them. However, his arrogance gets the better of him, which also makes him even more demented and psychotic.

With Scourge's voice, his voice is only slightly similar to Sonic's, but a lot more sinister, a lot more arrogant, and a lot more demented. He tends to have a very loud attitude whenever he is pissed off, and is very crass and rude to everyone he talks to. If he feels he is being betrayed, he will not hesitate to retaliate.