In Paper Mario: The Origami King, who is the main antagonist?

In Paper Mario: The Origami King, King Olly is the main antagonist. He is a sentient origami figure who seeks to transform the Mushroom Kingdom and its Toads into folded paper.

Olly was created by the Origami Craftsman, a Toad, using a forbidden Fold of Life technique. The craftsman wrote a message on Olly's body intending it as a blessing, but Olly misunderstood the writing as an insult. That mistake fuels his hatred of Toads and drives the game's central conflict.

King Olly wraps Peach's Castle in five decorative origami streamers and commands the Legion of Stationery, a group of animated office supplies. Mario and Olivia must remove the streamers, defeat Olly's forces, and eventually confront him in the Origami Castle.

Players sometimes confuse Olly with Bowser because Bowser is a recurring Mario villain, or with Dimentio and Count Bleck, who belong to Super Paper Mario. Those characters are not the central villain of The Origami King.