Olivia

Olivia is Mario's main ally in Paper Mario: The Origami King, taking a similar role to Kersti in Paper Mario: Sticker Star and Huey in Paper Mario: Color Splash. She is King Olly's younger sister, although it was later revealed that he essentially created her. Her traits include her folded crown and hair, her yellow robe, and her spiky limbs. She can transform into large origami creatures on certain Magic Circles. This can be done on the field or in battles. After King Olly died upon being beaten by Mario and Olivia, she, as part of King Olly's final request to make amends for the horrors he enacted, folded up his body to be the final crane for the 1000 cranes technique, and wished to undo everything King Olly caused. As she had been created by King Olly, that also resulted in her own demise, although the true ending post-credits scene implies that she and Olly survived, or at least recreated by the Origami Craftsman.

Paper Mario: The Origami King

 * European website bio: "Olly's younger sister, Olivia uses her powers for good - teaming up with Mario to take down her older sibling. Olivia loves adventure, and will help you find the right path if you're ever stumped"

Trivia

 * In the Japanese version, Olivia tends to finish her sentences with "ですわ" (desu wa), a stereotypical speech pattern often used by princesses, noblewomen and arrogant women in Japanese media, similar to how Princess Peach talks in Itadaki Street DS and Fortune Street.