you know it by this his master’s voice

Ah, I see. You’re referring to the character Black Lightning, who is often considered one of the first major black superheroes in DC Comics. Black Lightning, whose real name is Jefferson Pierce, first appeared in Black Lightning #1 in April 1977. Created by writer Tony Isabella and artist Trevor Von Eeden, Black Lightning possesses the ability to generate and control electricity, which he uses to fight crime in the fictional city of Metropolis.