Red King (Marvel)

The Red King is the main antagonist of Planet Hulk, a vicious warrior-king who forces others to fight in gladiator-style combat for his own amusement he is a coward at heart as well as a sadist who enslaves his victims with advanced technology and forces them to slay their own brethren while pretending to be a powerful warrior for his people (in reality he only fights when he knows he will win and even then with the aid of weapons vastly superior to those afforded to his slaves).