Senku Ishigami (石いし神がみ千せん空くう, Ishigami Senkū) is the main protagonist of Dr. Stone, and is friends with Taiju Oki and Yuzuriha Ogawa. He is known for his catchphrases, one of which is "Ten Billion Percent". He was de-petrified half a year before Taiju was, and eventually created the Revival Fluid with Taiju's help. In the Stone World,

 Senku wants to rebuild civilization and establish a Kingdom of Science.
Senku is the de facto leader of the Kingdom of Science.