The Dark Emperor, formerly known as the Dark Lord, is the main antagonist in the Find Mii series. He was behind the events of Find Mii II.
The Dark Emperor also appears in the Find Mii stage in Super Smash Bros. for Nintendo 3DS, acting as a pseudo-boss.
After the defeat of the Ultimate Ghost, the Dark Lord swoops down and grabs the Monarch by the tail. He plans to swallow up all the light in the world, transforming it into a land of darkness. He is defeated by the hero and explodes.
The Dark Emperor reappears in the second game and has gained more power, he is however, defeated once again.