Namor the Sub-Mariner doesn't fit the mold of a hero. He constantly rides the lines of what that means and what that is. With that, he's made a lot of mistakes, either purposefully without regret or accidentally with regret. However, when he sees that Attuma the Conqueror is running Atlantis as a dictatorship, and wants to reign over the surface world as well, Namor is the only one who can stop him.