Kiyoto Maki (真木 清人 Maki Kiyoto) is a character in Kamen Rider OOO. Later, he became the main antagonist of series. He was one of the finest scientists of the Kougami Foundation and was the man in charge of the Kougami Biotech Labratory before departing and officially joining up with the Greeed. After absorbing the purple Core Medals, he becomes the reincarnation of the Kyoryu Greeed (恐竜グリード Kyōryū Gurīdo, Dinosaur Greeed).