Scourge’s beginnings are unknown for the most part, due to the fact that he seems to keep them very under-wraps for sensitive reasons. What is known about him is that he came from the otherworld of Moebius, anti-version to Mobius Prime, where bad is good and good is bad. As a result of being born as the Sonic of this world, Scourge was christened with all that Sonic was not: a downright nasty, womanizing, chauvinistic and self-important douchebag.
He rules Moebius as its King, a title which he claimed when he and the Anti-Freedom Fighters overthrew the previous King. He now simply rules as he wishes, without question, lest the opposing word be beaten down by Scourge himself. Of course, being the speed-demon he is, his attention span grew short, and he grew bored, thus, he and his squad began to travel to Mobius Prime to screw up their word, seeing as there were no worthy opponents on Moebius.
Also, the ladies dig the jacket, and he damn well knows it.
(I'll likely add more to this later.)