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Significant plot details follow.
Napoleon is the main antagonist in Rhythm Thief and the Emperor's Treasure. He commands a group of knights called the Chevaliers Diabolique. He seeks something called the Dragon Crown that leads to the ancient wonder of the world, the Hanging Gardens of Babylon.
Chapter 1: Chance Encounter Edit
Napoleon is first seen hunting down Marie when she runs to Phantom R for help on Pont Alexandre III bridge. When asked who he is, he declares that he is the emperor, Napoleon and demands that Marie be handed over to him. When Phantom R says that he must be lying because Napoleon Bonaparte has been dead for two centuries, Napoleon tells him that there are mysterious forces in the world that Raphael cannot imagine. After which he sends the Chevaliers Diabolique after Phantom R. After defeating them in the minigame Battle Diabolique, Phantom R grabs Marie and they jump across the river while Napoleon calls Phantom R a miserable monkey.
Chapter 2: On the Trail of the Mark Edit
After Phantom R and Marie solve the puzzle of the window at the Notre Dame Cathedral and have the first part of the Dragon Crown in hand, Napoleon arrives and thanks them for getting the first part for him. He then sends out the Chevaliers to attack Raphael again.
They surround Marie and the Bracelet of Tiamat glows and causes the Chevaliers and Napoleon to float in the air while Phantom R and Marie make their escape.