Gen Asagiri is a cunning and charismatic mentalist in the anime series Dr. STONE. Initially introduced as an antagonist, he is sent by Tsukasa to spy on Senku's group. However, Gen's true nature is more complex, as he values his own survival and comfort over loyalty. He eventually sides with Senku, drawn by the promise of cola and the allure of science. Gen's quick wit and psychological insight make him an invaluable ally in Senku's quest to rebuild civilization through scientific advancements.