Speed-o'-Sound Sonic, more commonly called Sonic, is a recurring villain and occasional anti-hero.

Despite his normally calm demeanor, Sonic loves fighting, motivated by bloodlust against weak opponents, motivated by the thrill of battle and his superiority against strong opponents he can beat, and motivated by competition against a strong opponent he can't beat.

Sonic has a large ego, and when he sets his mind to killing someone, he refuses to give up until he succeeds.