Greeed are fictional creatures from the Japanese tokusatsu series Kamen Rider OOO. They are born from the desire of humans and seek to obtain powerful items called Core Medals to fulfill their insatiable cravings. Each Greeed represents a specific desire, such as greed, lust, or hunger, and they often engage in battles with the series' protagonist, Kamen Rider OOO. The Greeed are characterized by their ability to transform and gain new powers by collecting Core Medals. They can also create monsters known as Yummy, which are manifestations of human desires. The conflict between the Greeed and Kamen Rider OOO drives the narrative of the series, exploring themes of desire and morality.