|Class|| Ancient Ruler of Boo
Founder of the Boo Kingdom
|Family and Relations|
|Emperor, Your Highness|
|First Appearance||Super Mario: An Evil Rising|
The Emperor tries to come up with a way to stop the War Mage. Then, Luigi comes and decides to help him. After Luigi transforms the War Mage into the War Mage Sword, the Emperor keeps the sword and Luigi leaves.