Ankh is a key character in the series Kamen Rider OOO. He is a Greeed, a monster driven by desire, who allies with the protagonist Eiji Hino to gather the Core Medals. Ankh takes possession of Shingo Izumi's body, which allows him to interact with the human world. His role is both an anti-hero and a reluctant ally, offering guidance, power, and comic relief throughout the series, while struggling with his own conflicting motivations and desires.