Kiyoto Maki (真木 清人, Maki Kiyoto) is the main antagonist of Kamen Rider OOO. He was a scientist of the Kougami Biotech Laboratory who secretly collaborated with the Greeed and transformed into the Kyouryu Greeed (恐竜グリード, Kyōryū Gurīdo, Dinosaur Greeed) after absorbing the purple Core Medals.