Senku Ishigami (石いし神がみ千せん空くう, Ishigami Senkū) is friends with Taiju Oki and Yuzuriha Ogawa. He was depetrified half a year before Taiju was, and eventually created the Revival Fluid with Taiju's help. In the Stone World, Senku's goal is to rebuild civilization and establish a Kingdom of Science. Senku is also the leader of the Kingdom of Science, providing the ideas and initiative for their large-scale plans.