Gara

Gara is one of the four alchemists that created the Core Medals for the First Kamen Rider OOO eight centuries ago. She serves as the primary antagonist of Kamen Rider OOO: WONDERFUL Shogun and 21 Core Medals.

Abilities
As an alchemist Gara helped create the Core Medals which in turn created the Greeed. She is also able to create things like her familiar, Bell, her Knights, and the Nue Yummy. Gara also demonstrated the ability to cause a time distortion between two timelines. She is able to transform into a monster form based off the Greeed.

History
Gara along with three other alchemists were ordered by a king to help him achieve godhood. Taking an interest in this request, Gara accepted hoping to gain some of the power. However by the time the orange Core Medals were completed; the king, out of fear, sealed Gara away.

Reawakening eight centuries later due to the actions of Kosei Kougami, Gara causes a time distortion which sends the people of present Tokyo into the past to the city of Edo. By using the Core Medals, Gara plans to become the King of the World and calls herself the True OOO.