Zebediah Killgrave, also known as the Purple Man, was once a Croatian spy sent on a secret to steal a special experimental nerve agent. But as he got caught one of the gaurds tried to shoot him but missed, hitting the tank and dowsing him with the gas. The nerve agent turned his skin and eyes purple. When he was about to get arrested he told a weak excuse. Much to his suprise, the gaurds believed him. After the failed mission, Killgrave came to the realisation he had the ability to secrete pheromones once inhaled by another person he can control them using through literal verbal commands making them completely obedient to him. With it he abandoned his career as has a spy to terrible crimes, robbery, attempted world domination. And when that doesn't work out he constantly goes around making people give him food and shelter, if somebody annoys him he would make them to hurt themselves or worse and he even forces beautiful women and attractive teenage girls alike to have sex with him.
At first he only needed to be physically present to control someone but over time, he to could bend hundreds possibly thousands of people to his will. Despite not always attempting world domination like M.O.D.O.K. of A.I.M or Red Skull of HYDRA He is Acknowledged as a dangerous enemy and crimelord even by the the Avengers, but his plans are constantly foiled by his arch-enemy Jessica Jones her husband Luke Cage and Daredevil the first person to resist and defeat him.