In the 1940s The Black Cobra was Jim Hornsby, a law clerk working in the office of his father, the local district attorney.
He dressed up as The Black Cobra to fight crime for no discernable reason other than wanting to fight crime, his younger brother; Bob Hornsby helped him as his side-kick Cobra Kid.
He had no special skills, gadgets or powers, just a good right hook and a pretty good costume. Those darn slippery cobras!
Starting out in Harry A. Chesler’s Dynamic Comic # 1 this Black Cobra only appeared in that one issue
Later the character was used by AC.