Kamen Rider OOO is the title hero and main protagonist of the tokusatsu series Kamen Rider OOO. He is a masked hero who fights monsters called Yummies using the power of Core Medals and the O Medals. The character is the combat identity used by Eiji Hino, who transforms into Kamen Rider OOO to protect people and stop the ambitions of those exploiting the Greeed. As the central figure of the series, he drives the story’s themes of desire, sacrifice, and humanity.