Scourge is a vile creature, 

During the war, Scourge joined the Decepticons, not because of ideological reasons, but rather that they would overlook his well, indulgences. 

Scourge was a general during the war and he grew a reputation of, well, do not mess with this guy, do not mess with him!

He oversaw the genocide of three organic worlds, he executed a battalion of Autobots that had surrendered. 

He also had tendencies to kill those that disappointed him, including his own men. 

He also likes to tear out the hearts of his victims and make them eat them. 

Despite his brash and evil tendencies, Scourge is quite well educated and often talks down and convinces his enemies to surrender so that he may kill them, painfully. 

His voice is silky smooth but with a rough hard edge, cruel but calm.