Yakov Nikitin (ヤコフ ・ニキーチン Yakofu Nikīchin) is a character in the manga Dr. Stone. Yakov was the doctor on board the International Space Station (ISS) alongside his wife Darya Nikitina. While in space, he witnessed the petrification of all human life on Earth's surface from the ISS. He later founded Ishigami Village.